Hoffman Controls Model 610 Series Manual

If one of the above conditions occurs, the Model 610 operates a
TRIP
relay to disconnect power from the load. An
ALARM
relay is also provided
that can be used to alert operators of a lockout condition. The number of
automatic trip resets allowed before a lockout occurs is operator selectable.
The
automatic
trip reset time is also selectable.
When protecting
3 phase loads, t
When protecting 3 phase loads, tWhen protecting
he Model 610 detects phase
The class II Model 610 Digital Current Monitor offers the latest
technology for providing positive and accurate over current motor
(load) protection for single, and 3 phase motors, drawing between 5
and 200 amps. The Model 610 also can monitor up to two thermistor
temperature sensors to detect abnormally high and/or low compressor
operating temperatures.
Motor protection is accomplished by monitoring the operating
motor current, in each phase of the load, using current transformers.
For both single and 3 phase loads, the control digitally processes the
sampled current and calculates the excess energy being absorbed by
the motor due to current flow above the operator selected trip level.
If the current is above the selected trip level, the controller calculates
the excess power and integrates to calculate excess energy. When the
excess energy rises to a level equivalent to locked rotor for 2 seconds,
a current trip will occur. If the current drops below the trip level prior
to a trip, the controller will reset the integration to zero. This prevents
false-alarm trips. Fail-safe operation is provided by protecting the load
from excessive current or abnormal temperatures in one or more of
the following overload conditions:
Hoffma
n
|
Controls
Complete
Installation & Opera-
Complete Installation & Opera- Complete
ting Instructions for Model
702-0610-325
Model 610
Digital
Current Monitor
1
Introduction
imbalance
and can also verify correct phase rotation during each
load's startup.
Setting the current trip level at 8% above the nominal FLA of the
motor will indirectly provide both low and high voltage protection.
Setting the current trip level at other percentage levels above FLA will
directly prot
ect the motor.
The optional, customer supplied, Omega 10K thermistor tempera-
ture sensors can be used to monitor compressor exhaust temperature
and crankcase oil temperature. Omega offers a wide range of therm-
istor sensors that are readily available. The trip temperature values are
operator selectable. The Exhaust high temperature value can be set
between
80
°
F
and
300
°
F
or between
100 Ohms
and
2
0K Ohms
.
The Oil temperature trip values can be set for high, low or both high
and low trip temperatures between
20
°
F
and
200
°
F
or between
200
Ohms
and
2
0K Ohms
. Consult factory for different temperature
ranges.
This micro controller based Model 610 Digital Current Monitor is
available in four different models:
1)
Model 610-1PH
Provides single phase motor protection
2)
Model 610-3PH
Provides three phase or single phase motor
protection
3)
Model 610-1PH(MOD)
Provides single phase motor protec
tion and Modbus RTU remote
operation.
4)
Model 610
-3PH(M
OD
)
P
rovides
three phase
or single phase
motor
protection
and
Modbus
RTU
remote
operation
.
All four Model 610 Digital Current Monitor models can be
operated locally using the four push buttons and
LCD
screen. The
two Modbus models [ending in
(MOD)]
can also be operated
remotely using a Modbus RTU master controller.
All Model 610 Monitors operate on 24 VAC (2.5 VA).
The Model 610 Current Monitor consists of
a Kydex covered
PCB on standoffs, with a 32 character LCD and four push
buttons. The LCD is used 1)
to
display operational information
and 2) for setting parameters and numerical values via a menu
system. The menu system allows the operator to:
1)
Reset a trip
2)
Select the number of monitored current phases.
3)
Select the over current trip level.
CAUTION:
Failure to read, understand and follow the accompanying
instructions and diagrams, prior to completing the instal-
lation, may result in permanent damage to the motor.
�
Electrical Overcurrent Mechanical Overload
Single & 3 Phase Wear
Phase Imbalance Binding
Low/High Voltage Friction
Locked Rotor Stall
Power Factor Torque
Compressor Temperature Abnormalities
High Exhaust Temperature
High and/or Low Oil Temperature
Description
IMPORTANT:
When using the Model 610 Digital Current
Monitor, select
a transformer to meet the requirements of all the 24 VAC
components being used.
�
Single & 3 Phase Wear
Phase Imbalance Binding
Low/High Voltage Friction
Locked Rotor Stall
Power Factor Torque

2
4)
Activate or de-activate
checking phase order on power up.
5)
Select the % phase imbalance trip level.
6)
Select the phase imbalance delay time.
7
)
Select the type of exhaust and / or oil temperature sensors used
and their trip levels.
8
)
Select the number of automatic trip resets before lockout
occurs.
9
)
Select the delay time between automatic reset attempts.
10
)
Select when an external alarm should be activated.
1
1
)
Select the Modbus RTU settings.
12)
Restore the control to factory default settings.
During normal operation, all the Model 610 Monitors' LCDs
display a Home Screen which shows the following information:
1)
The present amp draw from the load's phase that is car-
rying the highest current.
2)
The present highest sensed temperature value. When both the
Exhaust
and
Exhaust and Exhaust
Oil
sensors are activated, only the sensor that has
the highest temperature is displayed on the Home Screen.
3)
The number of automatically reset trips allowed before a
lockout occurs.
4)
The number of automatically reset trips that have occurred
since the last
lockout
occurred, whether
triggered
locally
or remotely
.
or remotely. or remotely
By pressing the
DOWN
button during normal operation, the
LCD will display, in real time, all three phase currents in amps, and
both sensor
temperatures in
°
F
, even when the
F, even when theF
y are not being used
(installed) or have not been selected
. The unused phase currents and
temperature sensor values are displayed as "
0
".
By pressing the
UP
button during normal operation, the LCD
will display the following information about the last trip that
occurred:
1)
The trip type (current, phase imbalance, temp high, temp low,
phase order).
2)
The value that caused the trip, and the time in hours since the
last trip occurred (up to 32,000 Hrs.).
3)
The stored current values, for all three phases, that caused a
phase imbalance during motor startup.
During a tripped condition, the LCD will display “
TRIPPED
”.
If the trip has resulted in a lockout, then “
MANUAL RESET
RQD
” will be displayed on the LCD.
All the Model 610's have an automatic time out that returns the
LCD to the Home Screen whenever the control's push buttons have
not been pressed for more then 5 minutes. If the time out occurs
before any menu changes have been saved (by pressing the
ENTER
button), the unsaved changes will be ignored.
The Model 610 Digital Current Monitor can be used for local,
remote or a combination of both local and remote operation.
The Model 610 Digital Current Monitor can be operated manu-
ally using the four (4) push buttons and LCD screen. The push
buttons (
MODE
,
UP
,
DOWN
and
E
NTER
) allow the installer to
NTER) allow the installer to NTER
use the LCD's menu system to select the desired mode and then
set the available options, parameters and numerical values associ-
ated with that particular mode.
The Model 610 Digital Current Monitor has six (6) modes with
each mode containing the specific menus
, submenus, parameters
and numerical value selections needed to implement that mode's
capabilities.
The LCD display routinely shows a Home Screen.
The
installer
can
verify or m
odify the Model 610's operation by
pressing the
MODE
button, a specific number of times, to
MODE button, a specific number of times, to MODE
enter the desired
mode
. After that mode's selected parameters and numeric values
have been reviewed or
updated, the Model 610's LCD automati-
cally returns to the Home Screen. To continue viewing or updating
another mode's parameters, the installer needs to press the
MODE
button the required number of times to enter that mode, as shown
in
TABLE 1
(below)
.
MODE
Button
Presses
Mode Displayed on LCD
1
Manual Reset
2
Current Trip Settings
3
Temperature Trip settings
4
Trip Auto Reset and Alarm
5
Modbus Settings
6
Reset Controller (to factory settings)
Number of Mode Button Presses
TABLE 1
By
pressing the
ENTER
button when one of the above modes
ENTER button when one of the above modes ENTER
is displayed on the LCD's screen, the operator enters that mode's
menus and submenus where specific actions can be taken and
specific numeric values can be set, using the
UP
and
DOWN
buttons. When that specific menu or submenu's selection is
correct, for the application,
press the
ENTER
button to
ENTER button to ENTER
save the
displayed setting and advance to the next submenu. Once all of
the mode's submenus have been displayed, pressing the ENTER
button one more time returns the LCD to the Home Screen
. Any
values or parameters that are changed are stored in the Model 610's
flash memory and will be retained during any power interruption.
R
emote operation requires a Modbus version of the Model 610
Remote operation requires a Modbus version of the Model 610 R
Digital Current Monitor
[models ending in "MOD"
that is con
Description Con't
IMPORTANT:
After updating any information displayed on the LCD's
screen, the installer MUST review ALL of the Model
610 Digital Current Monitor's mode, menu, submenu
and numerical value options to 1) ensure that all of the
operating parameters, needed for the application, have
been correctly selected and 2) also ensure that any un-
needed or undesired options or numerical values have
not inadvertently been left selected.
�
During
Local (Manual) Operation:
During Local (Manual) Operation:During
During
Remote Operation:
During Remote Operation:During

ne
ct
ed to a Modbus RTU communication link. A Modbus RTU
Master Computer is used to read and / or write data to any or all
of the
internal data registers of
each
Model 610
connected to the
communication link
.
Remote operation can be implemented, at any time, by using
a Modbus RTU master computer to send the appro
priate register
data, listed in
Table
6A & 6B
,
on pages 13 & 1
4
,
to the Model
610's internal data registers, via a 3 wire Modbus RTU connection.
All of the Model 610's
options,
parameters and numerical values
can be read and set remotely using the Modbus
RTU connection.
NOTE:
Since t
he Model 610's operation is controlled by the
data stored within its internal registers, the Model 610
provides
the same identical operation,
whether
the register data is changed
locally (
m
anually) or remotely.
When
the Model 610 is equipped with Modbus, all sensed
current and temperature values, all trip information, and all
settable parameters and numerical values can be remotely viewed
and/or updated using a Modbus RTU master computer. The
Modbus RTU
master computer can read and or write information
(data) to each
Model 610
connected to Modbus. See the
Modbus
RTU Operation
section
(page 16) for additional information.
A combination of local and remote operation can be used to
remotely download and verify any of the Model 610's updated
parameters and numerical values. An installer observes local opera-
tion after the download, then makes and verifies any further
operational improvements, before the register data is uploaded to
the remote site and saved for future use.
1.
The Model 610 Digital Current Monitor is designed for u
se
with single phase or three (3) phase motors (across
-
the-line or part
3
Description Con't
Installation
[split] winding) that draw between 5 and 200 amps.
2.
The
TRIP
and
ALARM
relays' maximum output ratings are:
24 VAC at 10 Amps each.
3.
Wiring must comply with Local and National Electrical
Codes.
4.
Locked Rotor Amps (LRA) is calculated as 5 times the motor’s
running (trip) amps.
5
.
Do not mount the Model 610 in an airtight cabinet/compart-
ment or on a vibrating surface.
For Both Local and Remote Operation:
NOTE:
The Model 610 Digital Current Monitor is not weatherproof
and needs to be protected from moisture and condensation
.
IMPORTANT:
T
he
TRIP
and
ALARM
relays'
N.O.
and
N.C.
terminal
names correctly identify the functions of these terminals
after 24 VAC power is applied to the Model 610. When
24 VAC power is turned off, the TRIP and ALARM
relay's
N.O.
to
COM
contact is
closed
and the
closed and the closed
N.C.
to
COM
contact
is
open
.
This arrangement was chosen to
enab
le the Model 610 Digital Current Monitor to discon-
nect power to the motor and enable an alarm in the event
that the Model 610 Digital Current Monitor loses power
or fails.
�
Current Transformer Alignment
Figure 1
IMPORTANT:
If any of the down loaded Modbus RTU data is incor-
rect, the Model 610 Digital Current Monitor's micro-
controller will change the incorrect data into software
selected default values during the Model 610's next
operating cycle. Therefore, after updating any data
manually or remotel
y,
manually or remotely,manually or remotel
th
e operator
MUST
allow the
Model 610 to operate
for a brief time period
before re-
for a brief time period before re-for a brief time period
viewing ALL of the data contained in each of the
Model
610
's
3
2
register addresses to 1) ensure that all of the
operating parameters and numerical values, needed
for the application, have been correctly selected and 2)
also ensure that any unneeded or undesired options or
numerical values have not inadvertently been left
selected.
�

6
.
Do not route the low voltage CT wires in the proximity of
power wires or wire conduits.
7.
The Model 610 uses Current Transformers (CTs) to monitor
the current flowing through each motor's power wire that is
equipped with a current transformer. The CTs are installed as
shown in
Figure 1
. When more then one (1) CT is used to
monitor motor
(
load) current, all
the installed CTs must be
oriented in the same direction, as shown in
Figure 1
,
Current
Transformer Alignment
(page 3)
Transformer Alignment (page 3)Transformer Alignment
to provide accurate in-phase
information.
8.
For convenience the CT's black wires may be connected
together and a single black wire can be routed to any one of the
Model 610's CT1-, CT2- or CT3- terminals.
To protect 3 phase across-the-line motors, proce
ed with the
3
Phase, Across-the-Line, Motor Installation
section below.
To protect single phase motors, proceed to the
Single Phase
Motor Installation
section below.
To protect 3 phase part (split) winding motors, proce
ed with the
P
art (Split) Winding
Motor
Information
section on page 6.
To monitor compressor temperatures, proceed to the
Com-
pressor Temperature Sensing Information
section on page 12.
To operate the Model 610 remotely, proceed to the
Modbus
RTU Installtion
section on page 15.
1
.
Disable all line power goin
g to the motor contactor and
motor.
2
.
Disconnect all factory wiring connecting the motor to the
load side of the motor contactor.
3.
Refer to
Figure 1, "Current Transform
er Alignment"
(page 3) to install the three (3) current transformers. Place a single
current transformer on each of the three (3) power wires connected
to the m
otor. The sides of the current transformers, with the black
text printed on the yellow background,
must
all be pointed in the
must all be pointed in the must
same direction (CT signals in phase).
4
.
Spacing between the 3 adjacent CTs, shown in
Figure 1
, is
nor critical.
5.
Re-connect the motor's power wiring, removed in step 2
above, to the load side of the motor contactor.
6
.
Referring to
Figure 1
and
Figure 2, "Model 610 3 Phase
Wiring Diagram"
(
page 5)
,
connect the current transformer's
4
3 Phase, Across the Line,
Motor Installation
wires to the Model 610 Digital Current Monitor's CT terminals
a
s
shown in
Table 1
below
.
3 Phase, Across-the-Line,
Current Transformer
Wiri
ng
Table 1
6
.
Connect 24VAC power, as shown in
Figure 2
“
Model 610,
3 Phase Wiring Diagram
” (page 5).
7
.
Connect
the
TRIP
relay's
N.C.
terminal to a 24 VAC source
as shown in
Figure 2
.
8
.
Connect
the
TRIP
relay's
COM
terminal to the 24 VAC side
of the motor contactor's coil
as
shown in
Figure 2
.
9
.
If an
alarm notification is desired, connect the alarm's 24
VAC wires to the
ALARM
relay's
N.O.
and
COM
terminals.
10.
If compressor temperature sensing or Modbus RTU
communication is desired,
refer to
Figure 7,
Model 610 Exhaust
Sensor, Oil Sensor and Modbus Wiring Diagram (page 13)
and
the
Compressor Temperature Sensing Information
section (page
12) and / or the
Modus RTU Installation
section (page 15)
for
details
.
11.
This completes the
3 Phase, Across-the-Line, Motor's Model
610 Digital Current Monitor's hardware installation. Continue
with the
Normal Operation
section on
page 11
.
1
.
Disable all line power going to the
motor contactor and
m
otor.
2
.
Disconnect all factory wiring connecting the motor to the
load side of the motor contactor.
WARNING:
Disconnect power from the motor(s) and ensure the motor(s)
is/are electrically disabled prior to the Model 610 Digital
Current Monitor's installation.
Installation Con't
WARNING:
Current Transformer wires
must
be c
must be cmust
onnected to
the Model 610 Digital Current Monitor's terminal
block before operation of the motor. The Current
Transformers will generate high voltages if the wires
are left unconnected (open circuited).
Motor Contactor CT Wire Model 610
Load Terminal Color PCB Terminal
T
1
White CT1+
Black CT1-
T2
White CT2+
Black CT2-
T3
White CT
3+
Black CT3-
Motor Contactor CT Wire Model 610
Load Terminal Color PCB Terminal
White CT1+
Black CT1-
Black CT2-
White CT
Black CT3-
Motor Contactor CT Wire Model 610
Load Terminal Color PCB Terminal
White CT1+
Black CT1-
White CT2+
Black CT2-
White CT
Black CT3-
Single Phase Motor
Installation

Single Phase Current Transformer
Wiring
TABLE 2
10.
If compressor temperature sensing or Modbus RTU com-
munication is desired,
refer to
Figure 7
,
Model 610 Exhaust
Sensor, Oil Sensor and Modbus Wiring Diagram
(
page 13
)
and
the
Compressor Temperature Sensing Information
section (page
12) and / or the
Modus RTU Installation
section (page 15)
for
details
.
5
3
.
Refer to
Figure 1, "Current Transformer Alignment"
(page 3) to install the single current transformer
(CT) on the
power wire connected to the m
otor. The CT's orientation is not
important.
4
.
Re-connect the motor's power wiring, removed in step 2
above, to the load side of the motor contactor.
5
.
Referring to
Figure
3, Model 610 Single Phase Wiring
Diagram (
page 6
)
, connect the current transformer's
wires to the
Model 610 Digital Current Monitor's CT1 terminals
a
s shown in
Table 2, "
Single Phase
Current Transformer Wiring"
"
(
page
5
)
.
6
.
Connect 24VAC power as shown in
Figure
3
.
7
.
Connect
the
TRIP
relay's
N.C.
terminal to a 24 VAC source
as shown in
Figure 3
.
8
.
Connect
the
TRIP
relay's
COM
terminal to the 24VAC side
of the motor contactor's coil,
as shown in
Figure 3
.
9
.
If an
alarm notification is desired connect the alarm's 24
VAC
wires to the
ALARM
relay's
N.O.
and
COM
terminals,
as shown
in
Figure 3
.
Single Phase Motor
Installation Con't
WARNING:
Current Transformer wires
must
be c
must be cmust
onnected to
the Model 610 Digital Current Monitor's terminal
block before operation of the motor. The Current
Transformers will generate high voltages if the wires
are left unconnected (open circuited).









  


  






�








 
 













 


















Motor Contactor CT Wire Model 610
Load Terminal Color PCB Terminal
T
1 White CT1+
Black CT1-
Motor Contactor CT Wire Model 610
Load Terminal Color PCB Terminal
1 White CT1+
Black CT1-
Motor Contactor CT Wire Model 610
Load Terminal Color PCB Terminal
1 White CT1+
Black CT1-

6
















�


















 















 











11.
This completes the
Single
Phase Motor's
610 Digital
Current Monitor's hardware installation.
Continue with the
Normal Operation
section on page 11.
Part (
s
plit)
winding motors can be protected, using either one
(1) or two (2) Model 610
Digital
Current Monitors, by following
one of the two methods shown below and on the next page:
Method 1:
This method uses only one (1) Model 610
Digital
Current Monitor
by placing two CTs on
Starter
A
phases
A phases A
T
1
and
T
2
, and placing the third CT on the
Starter
B's
phase
T
3
. Set the
phase imbalance trip point at 29% or less. The current trip level
should be the motor FLA times 1.08 (8% about the FLA). This
method will protect against all major faults in either part winding.
Method 2:
This method uses two (2) Model 610 monitors by
placing one (1) CT on each power wire connected to both of the
Starter A
and
Starter A and Starter A
Starter B
motor contactor's
T1
,
T2
and
T3
termi-
nals (total of
6 CTs)
.
This method provides complete coverage.
The
selected trip current level, used by each Model 610, should be 1/2
FLA
(the current allowed in each part winding times 1.08 [for 8%
over current])
.
To protect a 3 phase part (split) winding motor, using a single
Model 610
Digital
Current Monitor (
M
ethod 1), proceed to the
Single 610 Part (Split) Winding Motor Installation
section below.
To protect a 3 phase part (split) winding motor, using two
Mod-
el 610
Digital
Current Monitors (
M
ethod 2), proceed to the
Dual
610 Part (Split) Winding Motor Installation
section on page 8.
1
.
Disable all line pow
er going to both the
Starter A
and
Starter A and Starter A
Starter
B
motor contactors and motor.
Single 610 Part (Split)
Winding Motor Installation
WARNING:
Disconnect power from the motor(s) and ensure the motor(s)
is/are electrically disabled prior to the Model 610 Digital
Current Monitor's installation.
Single Phase Motor
Installation Con't
NOTE
:
T
he Model 610 Digital Current Monitor
allows a
he Model 610 Digital Current Monitor allows a he Model 610 Digital Current Monitor
part (
split) winding
motor's 2
nd
he Model 610 Digital Current Monitor
nd
he Model 610 Digital Current Monitor
circuit to energize
for an operator selectable 2.0 to 30.0 seconds, after
power is applied to the
1
st
part (split) winding cir-
st part (split) winding cir- st
cuit,
prior to checking for
phase rotation errors or
phase imbalance issues
.
The default is 3.0 seconds.
Part (Split) Winding Motor
Information

7






















 
 













 




  
  




  
  


 � 










2.
Disable all factory wiring connecting the motor to the load
side of the
Starter A
motor contactor.
Starter A motor contactor.Starter A
3
.
Refer to
Figure 1, "Current Transformer Alignment"
(page 3) to install the current transformers.
Place a single
current
transformer on each
power wire
connected to the m
otor
that was
previously connected to
the
Starter A
contactor's load side
Starter A contactor's load side Starter A
T1
and
T2
terminals.
4
.
Re-connect the motor's power
wiring, removed in step
2
above, to the load side of the
Starter A
motor contactor.
5
.
Disconnect the factor
y wiring connecting the motor to the
T3
terminal on the load side of the
Starter
B
motor contactor.
6
.
Refer to
Figure 1
(page 3) to install a single current trans-
former
on the motor's
power wire
that was
previously connected
to
the
Starter
B
contactor's load side
T3
terminal. Orient this
third CT in the same direction as the two (2) CTs on the
Starter A
phases
T1
and
T
2
.
7
.
Spacing between adjacent CTs, shown in
Figure 1
, is not
critical.
8.
Re-connect the motor's power
wiring, removed in step
5
above, to the
T3
terminal on the load side of the
Starter
B
motor
contactor.
9
.
Referring to
Figure 1
and
Figure
4, "Single Model 610 Part
(Split) Winding Motor Wirin
g Diagram"
(page 7),
connect the
current transformer's
wires to the Model 610 Digital Current
Monitor's CT terminals
a
s shown in
Table 3
on
page
8
.
10
.
Connect 24VAC power as shown in
Figure
4,
Single
Model
610 Part (Split) Winding Motor Wiring Diagram
(above).
1
1
.
C
onnect
the
TRIP
relay's
N.C.
terminal to a 24 VAC source
as shown in
Figure
4
.
1
2
.
C
onnect
the
TRIP
relay's
COM
terminal to the 24VAC
side of both the
Starter A
and
Starter A and Starter A
Starter B
motor contactors' coils as
shown in
Figure
4
.
Single 610, Part (Split)
Winding Motor Installation
Con't
Single Model 610 Part (Split) Winding Motor Wiring Diagram
Figure 4

Single 610, Three Phase Motor
Current Transformer Wiring
Table 3
13.
Verify the
Starter A
and
Starter A and Starter A
Starter B
, 24 VAC coils are wired
in parallel with the Model 610
TRIP
relay's
COM
terminal.
1
4
.
If an
alarm notification is desired connect the alarm's 24
VAC wires to the
ALARM
relay's
N.O.
and
COM
terminals,
as
shown in
Figure
4
.
15.
If compressor temperature sensing or Modbus communi-
cation is desired,
refer to
Figure 7
,
Model 610 Exhaust Sensor,
Oil Sensor and Modbus Wiring Diagram
(
page 13
)
and the
Compressor Temperature Sensing Information
section (page 12 )
and / or the
Mobus RTU Installation
section (page 15)
for details
.
16.
This completes the
Single 610 Part (Split) Winding
Motor's
Single 610 Part (Split) Winding Motor'sSingle 610 Part (Split) Winding
Model
610 Digital Current Monitor's hardware installation.
Continue with the
Normal Operation
section on page 11.
1
.
Disable all line pow
er going to the
Starter A
and
Starter A and Starter A
Starter B
motor contactors and split winding motor.
2
.
Disconnect all factor
y wiring connecting the motor to the
load side
of the
Starter A
motor contactor.
Starter A motor contactor.Starter A
3
.
Refer to
Figure 1
(page 3) to place one (1) current trans-
former
on each of the
power wires (with all CTs facing the same
8
way)
connected to t
he m
otor
that were
previously connected to
the
Starter A
contactor's load side terminals
Starter A contactor's load side terminals Starter A
T1
,
T2
and
T3
.
4
.
Referr
ing to
Figure
5
,
Dual Model 610 Part (Split) Winding
Motor Wiring Diagram
(page 9). Connect each of the current
transformer's
wires to the
# 1
Model 610 Digital Current
Monitor's CT terminals
a
s shown in
Table 4
(below)
.
Dual 610 Part (Split) Winding Motor Starter A
Current Transformer
Wiring
TABLE 4
5
.
Re-connect the motor's power
w
i
ring, removed
in
step
2
above, t
o the load side of the
Starter A
motor contactor.
6
.
Disconnect all factor
y wiring connecting the motor to the load
side of the
Starter
B
motor contactor.
7
.
Refer to
Figure 1
(page 3) to place three current transformers,
one (1) current transformer
on each of the
power wires
(with all
CTs facing the same way)
connected to the m
otor
that were
previ-
ously connected to
the
Starter
B
contactor's load side terminals
T1
,
T2
and
T3
.
8
.
Re-connect the motor's power
wiring, removed in step
6
above, to the load side of the
Starter
B
motor contactor.
9
.
Referring to
Figure
5
,
Dual Model 610 Part (Split) Winding
Motor Wiring Diagram
(page 9),
connect the current transformer's
wires to the
# 2
Model 610 Digital Current Monitor's CT termi-
nals
a
s shown in
Table 5
(
page
11
)
.
10
.
Connect 24 VAC power as show
n in
Figure
5,
“
Dual
Model
6
10 Part (Split) Winding Motor Wiring Diagram
” (page 9) to
both the
#
1
and
#
2
Model 610's.
1
1
.
C
onnect a
24 VAC source to
the
#
2
Model 610
TRIP
relay's
N.C.
terminal, as shown in
Figure 5
.
1
2
.
C
onnect
the
#
2
Model 610
TRIP
relay's
COM
terminal
to
the
#
1
Model 610
TRIP
relay's
N.C.
terminal
, as shown in
Figure
5.
Continued on page 11
Single 610 Part (Split)
Winding Motor Installation
Con't
WARNING:
Current Transformer wires
must
be c
must be cmust
onnected to
the Model 610 Digital Current Monitor's terminal
block before operation of the motor. The Current
Transformers will generate high voltages if the wires
are left unconnected (open circuited).
Dual 610 Part (Split) Winding
Motor Installation
WARNING:
Disconnect power from the motor(s) and ensure the motor(s)
is/are electrically disabled prior to the Model 610 Digital
Current Monitor's installation.
Motor Contactor
#
1
Model 610
Starter A Starter B
CT Wire
PCB
Terminal Terminal
Color
Terminal
Color TerminalColor
T
1
N/A White CT1+
Black
CT1-
T2
N/A
White CT2+
Black CT2-
T3
N/A
White CT
N/A White CTN/A
3+
Black CT3-
Starter A Starter B
Terminal Terminal
N/A White CT1+
Black
N/A
Black CT2-
Black CT3-
Motor Contactor
Starter A Starter B
Terminal Terminal
N/A White CT1+
Black
N/A
Black CT2-
White CT
Black CT3-
CT Wire
Terminal
N/A White CT1+
Black
White CT2+
Black CT2-
White CT
Black CT3-
Motor Contactor
Starter A Starter B
CT Wire Model 610
Terminal Terminal
Color
PCB Terminal
Color PCB TerminalColor
T
1
N/A White CT1+
Black CT1-
T2
N/A
White CT2+
Black CT2-
N/A
T3
White CT
3+
Black CT3-
Starter A Starter B
Terminal Terminal
N/A White CT1+
Black CT1-
N/A
Black CT2-
N/A
Black CT3-
Motor Contactor
Starter A Starter B
Terminal Terminal
N/A White CT1+
Black CT1-
N/A
Black CT2-
White CT
Black CT3-
CT Wire Model 610
PCB Terminal
N/A White CT1+
Black CT1-
White CT2+
Black CT2-
White CT
Black CT3-

9
Dual Model 610 Part (Split) Winding Motor Wiring Diagram
Figure 5
  

  
 


























 
 



























 
 




  
  




  
  



�






   
 




10




































































































11
Model
610 Menu System
Flow Chart
Figure
6
13
.
C
onnect
the
TRIP
relay's
COM
terminal, on the
#
1
Model 610,
to the 24
VAC side of
both
the
both the both
Starter A
and
Starter A and Starter A
Starter B
motor contactors' coils as shown in
Figure 5
.
14.
Verify the
Starter A
and
Starter A and Starter A
Starter B
motor contactors's coils are wired in parallel to the
#
1
Model 610
TRIP
relay's
COM
terminal
.
1
5
.
If an
alarm notification is
desired, refer to
Figure 5
and:
1. Connect the alarm's 24
VAC wire to the
N.O.
terminals
on
both
of
both of both
the
#1
and
#2
Model
610's
ALARM
relays
.
2
.
Connect the alarm's 24
VAC RTN wire to the
COM
terminals on
both
both both
of
the
#1
and
#2
Model
610's
ALARM
rela
ys.
relays. rela
3.
Verify the alarm's 24
VAC
wire
is connected
in
parallel to both
the
#1
and
#2
Model 610
ALARM
rela
y's
relay's rela
N.O.
terminals.
4
. Verify the alarm's 24 VAC RTN wire is connected in parallel to
both
the
both the both
#1
and
#2
Model 610
ALARM
relay's
COM
terminals.
16.
If compressor temperature sensing or Modbus RTU communication is desired,
refer to
Figure
7,
Model 610 Exhaust Sensor, Oil Sensor and Modbus Wiring Diagram
(page 13)
and
the
Compressor Temperature Sensing Information
section (page 12)
and /or the
Mobus RTU
Installation
section (page 15)
for details
.
17.
This completes the
Dual 610 Part (Split) Winding
Motor
Dual 610 Part (Split) Winding MotorDual 610 Part (Split) Winding
's hard
ware installation. Continue
with the
Normal Operation
section below.
T
he controller will consistently display the Home Screen on the LCD showing the highest
phase's current, in amps, and the highest temperature in
°
F (when used). Also shown is the number
of trips that have been automatically reset since the last manual reset occurred, due to either an over
current condition or an abnormal temperature value, or a combination of the two.
By pressing and holding
down one of the
buttons shown below, while the Home Screen is
present on the LCD,
the following information will be displayed on the LCD:
DOWN
button - Disp
lays, in real time,
the current in each of the three (3) load's phases and the
two (2)
temperature
sensors
,
even when the
y are not installed or have not been selected. Unused or
un-selected current and temperature sensor inputs are shown as "
0
".
UP
button - Display
s the
last automatically reset trip, including the type of trip, the trip value,
and the time since that trip occurred (in hours).
OR
The LCD shows the stored current values that caused a phase imbalance during a part (split)
winding motor startup
.
T
he current value that is displayed on the Home Screen represents the maximum current pres-
ently being sensed by the CTs and
is used for the over current trip calculation.
Normal Operation
During Current Monitoring
Dual 610, Part (Split) Winding Motor
Installation Con't
desired, refer to
and:
VAC wire to the
the
610's
VAC RTN wire to the
of
610's
and: and:
Motor Contactor
and:
Motor Contactor
and:
Motor Contactor
and:
Motor Contactor
and:
#
and:
#
and:
2
and:
2
and:
Model 610
and:
Model 610
and:
Starter A Starter B
CT Wire
PCB
Terminal Terminal
VAC wire to the
Terminal Terminal
VAC wire to the
Terminal Terminal
VAC wire to the
Terminal Terminal
VAC wire to the
Terminal Terminal
VAC wire to the
Terminal Terminal
VAC wire to the
Color
VAC wire to the
Color
VAC wire to the
Terminal
VAC wire to the
Terminal
VAC wire to the
Color TerminalColor
VAC wire to the
Color
VAC wire to the
Terminal
VAC wire to the
Color
VAC wire to the
N/A
the
N/A
the
N/A N/A
T1
the
T1
the
White CT1+
the
White CT1+
the
White CT1+
the
White CT1+
the
Black CT1-
610's
Black CT1-
610's
Black CT1-
610's
Black CT1-
610's
Black CT1-
610's
Black CT1-
610's
VAC RTN wire to the VAC RTN wire to the
N/A
VAC RTN wire to the
N/A
VAC RTN wire to the
VAC RTN wire to the VAC RTN wire to the
T2
VAC RTN wire to the
T2
VAC RTN wire to the
VAC RTN wire to the VAC RTN wire to the
White CT2+
VAC RTN wire to the
White CT2+
VAC RTN wire to the
Black CT2-
610's 610's
N/A
610's
N/A
610's
610's 610's
610's
N/A
610's 610's
N/A
610's
T3
610's
T3
610's
White CT
610's
White CT
610's
White CT
610's
White CT
610's
3+
610's
3+
610's
Black CT3-
610's
Black CT3-
610's
Black CT3-
610's
Black CT3-
610's
Black CT3-
610's
Black CT3-
610's
VAC wire to the
Starter A Starter B
Terminal Terminal
VAC wire to the
Terminal Terminal
VAC wire to the
the
610's
VAC RTN wire to the
VAC RTN wire to the
Black CT1-
610's
Black CT1-
610's
VAC RTN wire to the VAC RTN wire to the
of
610's
Black CT2-
610's 610's
Black CT3-
610's
Black CT3-
610's
desired, refer to
and:
VAC wire to the
Motor Contactor
and:
Motor Contactor
and:
Starter A Starter B
Terminal Terminal
VAC wire to the
Terminal Terminal
VAC wire to the
the
610's
VAC RTN wire to the
VAC RTN wire to the
White CT1+
the
White CT1+
the
Black CT1-
610's
Black CT1-
610's
VAC RTN wire to the VAC RTN wire to the
of
610's
Black CT2-
White CT
610's
White CT
610's
Black CT3-
610's
Black CT3-
610's
desired, refer to
and:
VAC wire to the
the
610's
desired, refer to
Motor Contactor
and:
Motor Contactor
and:
CT Wire
Terminal
VAC wire to the
Terminal
VAC wire to the
White CT1+
the
White CT1+
the
Black CT1-
610's
Black CT1-
610's
VAC RTN wire to the
White CT2+
VAC RTN wire to the
White CT2+
VAC RTN wire to the
Black CT2-
of
610's
White CT
610's
White CT
610's
Black CT3-
610's
Black CT3-
610's
of
of
of
of
of
of
of
Dual 610 Part (Split) Winding Motor Starter
Dual 610 Part (Split) Winding Motor Starter
in
Dual 610 Part (Split) Winding Motor Starter
in
B
in
B
in
Current Transformer
in
Current Transformer
in
and
Current Transformer
and
Wiring
and
Wiring
and
TABLE 5
TABLE 5

12
Normal Operation Con't
Phase imbalance and phase order trips do not occur until
the trip situation has existed for the minimum time selected in
the "
Phase Imbalance Delay
" menu,
to allow the 2
nd
the trip situation has existed for the minimum time selected in
nd
the trip situation has existed for the minimum time selected in
winding,
on a part (split) winding motor application, to power up
.
(see
"
Sequence of Operation
" section, number "
7
", on page 17 for the
details)
If an exh
aust temperature or oil temperature sensor is being used
and the Model 610 detects a bad temperature reading,
a trip occurs
and
E
XHAUST
EXHAUSTE
_BAD
or
OIL
_BAD
OIL_BADOIL
is displayed on the LCD's
screen.
Temperature trips, due to out of range sensor temperatures
(either below a low temperature trip value or above a high temper-
ature trip
value)
occur immediately when the sensed temperature
reaches the trip value.
When a temperature trip occurs that will be automatically reset,
the LCD displays the type of trip (
EXHAUST
or
OIL
) and the
time in minutes until that trip will be reset automatically. If desired
the operator can manually reset the trip, during this automatic
reset time, by pressing and releasing the
MODE
button until the
MODE button until the MODE
LCD screen displays the "
For Manual Reset Press Enter
" message
and then pressing the
ENTER
button once.
ENTER button once.ENTER
If the controller has the Modbus option, then a command to
manually reset the controller,
as well as a command to
trip the
controller, can be sent remotely over the Modbus RTU connection
using address registers 16 and 18 respectively.
The operator can always check the trip level values and all the
other Model 610 Digital Current Monitor's parameters, by using
the menu system as described in the "
Sequence of
Operation"
section (pages 16 thru 19) or using the Modbus RTU connection
to read the Model 610's internal register data, using the
TABLE
6A
and
6B
information on pages 13
& 1
4
.
A
Model 610 Menu System Flow
Chart
Model 610 Menu System Flow ChartModel 610 Menu System Flow
(
Chart ( Chart
Figure
6
, pages 10 &
11)
is provided to allow the operator to track his/her progress
thru
the
various
LCD's screens.
The Menu System Flow Chart's infor-
mation is viewed starting from the Home Screen, located at the
top center
of the chart, and continuing counter clockwise around
the chart.
NOTE:
The
Model 610 Menu System Flow
Chart
informa-
tion is pre
sented in the same mode, menu and submenu order
as
the
information pre
sented on the
LCD
screen, when following the
chart's information in a
counter clockwise
direction
.
The Model 610 Digital Current Monitor is designed to work
with virtually all thermistor type temperature sensors. However,
due to the many differences in compressor types and sizes along
with the large availability of Omega thermistor temperature
sensors, Hoffman Controls does not offer a temperature sensor as
an option for the Model 610
Digital Current Monitor
.
T
he Omega Company manufactures a readily
available variety of
R - T
(resistance - temperature) sensors with
different temperature
ranges, sensor mounting configurations and wire lengths.
O
ther
manufactures also offer R - T style temperature sensors. However,
these sensors can have very different temperature resistance scales.
Therefore, the
Model 610 Digital Current Monitor is de
signed
to work with the Omega 10K
linear R - T
thermistor
temperature
sensor family, as well as other sensor manufacture's
extre
mely fast
(steep slope) R - T style temperature sensors.
The Model 610's Exhaust and Oil temperature sensor menu
options include the
Omega10K
, and steep slope
PTC
and
NTC
type R - T
thermistor
sensors. The
PTC
(
Positive Temperature
Coefficient) or
NTC
(
Negative Temperature
Coefficient) options
are selected when a steep slope R - T temperature sensor is used.
When t
he
Omega10K
sensor option is selected, the installer sets
Omega10K sensor option is selected, the installer sets Omega10K
the trip temperature in
°
F.
When either the
PTC
or
NTC
sensor
options are selected, the installer enters the trip temperature as the
steep slope sensor's trip resistance in ohms. For example:
If a PTC steep slope, R - T temperature sensor with a trip
resistance of 15K, at the desired trip temperature is used, the
installer would select the
PTC
sensor option, press the
ENTER
button and then use the
UP
and / or
DOWN
buttons to select
15000
ohms
.
Refer to
the
Sequence of Operation
section, paragraph numbers
8 thru 31 (pages 17 & 18) for the
Omega10K
,
PTC
and
NTC
operating details
.
1
.
Select a temperature sensor mounting configuration that
provides a safe and reliable temperature signal for the applica-
tion.
Always select a temperature sensor that exceeds the highest
expected compressor discharge temperature. When available, select
a wire length longer than required for the application.
2.
If additional wire is needed, use 22AWG (minimum) shielded
stranded, twisted pair cable properly insulated for the application.
The maximum length of additional
22AWG
wire is 75 feet. For
longer distances, consult the factory.
3
.
Follow the exhaust temperature sensor manufacturer's instruc-
tions and recommendations when installing the exhaust sensor on
the compressor's discharge line.
4
.
After securely mounting the sensor, refer to
Figure 7,
Model
610 Exhaust Sensor, Oil Sensor and Modbus Wiring Diagram
,
Continued on page 15
Exhaust Temperature Sensor
Installation
Compressor Temperature
Sensing Information
NOTE:
A current above the trip point will not immedi-
ately cause
the
controller to trip. Only when the
integrated excess power, over time, has exceeded
the equivalent to a locked rotor for 2 seconds will
the trip occur. If the over current drops below the
trip value, during the excess power
calculation
,
the controller resets the
excess power
calculator
to
calculator to calculator
zero, thus avoiding nuisance trips. If a different
trip integration time is desired, consult the
factory.
During Temperature Monitoring

13
MODBUS RTU
ADDRESS
DATA CONTENTS
DATA TYPE and RANGE
0
Trip Amps Times 10
Read & Write; Range = 5 to 200 Amps (All values times 10)
1
Number
Of Current Transformers Used
Read & Write; Codes: 1 = Single Phase; 3 =  ree Phase;
0 =
Temperature Only,
No Current Transformers Used.
2
Phase Imbalance Trip % (3 Phase Only)
Read & Write; Range =1% to 100%
3
Check Phase Order (3 Phase Only)
Read & Write; 1 = Yes
o
r
0= No
4
Auto Reset Delay Time
Read & Write; Range = 0 to 255 Minutes.
5
Use Exhaust Temperature Sensor
Read & Write; 1 = Yes
o
r
0= No
6
Exhaust Sensor Type
Read & Write; Codes: 0 = Omega 10K; 1 = PTC Resistance;
2 =
NTC Resistance.
7
Exhaust
Trip Temp Value
Read & Write;
Range =
8
0
°
F
to
300
°
F
or 100 Ohms to
20K Ohms Depending on Sensor Type (All values times 10)
.
8
Use Oil Temp
Read & Write; 1 = Yes
o
r
0 = No
9
Oil Sensor Type
Read & Write; Codes: 0 = Omega 10K; 1 = PTC Resistance;
2 =
NTC Resistance
.
10
Oil High Temp
Trip
Value
Read & Write;
Range = 0 or
2
0
°
F
to
200
°
F
or 200 Ohms to
20K Ohms Depending on Sensor Type; 0 is Used
W
hen
When W
High Temp Not Selected
.
Model
610 Modbus
Register
Data Information
TABLE
6A







 
 













 


















14
Time to Trip Chart
TABLE 7
Model
610 Modbus
Register
Data Information
TABLE 6B
O
ver
Current
(in %)
Time
To Trip
(Seconds)
105%
470 Sec
110%
225 Sec
115%
150 Sec
120%
110 Sec
125%
85 Sec
O
ver
Current
(in %)
Time
To Trip
(Seconds)
140%
50 Sec
165%
28 Sec
185%
20 Sec
205%
15 Sec
220%
12.5 Sec
O
ver
Current
(in %)
Time
To Trip
(Seconds)
240%
10 Sec
265%
8 Sec
300%
6 Sec
325%
5 Sec
360%
4 Sec
O
ver
Current
(in %)
Time
To Trip
(Seconds)
410%
3 Sec
4
30%
2.75 Sec
450%
2.5 Sec
475%
2.75 Sec
500%
2.0 Sec
MODBUS RTU
ADDRESS
DATA CONTENTS
DATA TYPE and RANGE
11
Oil
Low Temp Trip Value
Read & Write;
Range = 0 or
2
0
°
F
to
200
°
F
or 200 Ohms to
20K Ohms Depending on Sensor Type; 0 is Used When Low
Temp Not Selected
12
Max Number Of Auto Resettable Trips
Allowed Before a Lockout Occurs
Read & Write;
Range =
0 to 255 Trips.
13
Modbus Address Number
Read & Write;
Range =
1 to 247.
14
Modbus Baud Rate Code
Read & Write; Baud Rate Codes: 0 = 1200; 1 = 2400; 2 = 4800,
3 = 9600; 4 = 19,200; 5 = 38,400; 6 = 57,600; 7 = 115,200
15
Modbus Parity Code
Read & Write; Parity Codes are:
38 = Even Parity, With 1 Stop Bit.
54 = Odd Parity, With 1 Stop Bit.
14 = No Parity With 2 Stop Bits.
16
Manual Reset Required
Read & Write; 1 = Yes
o
r 0 = No.
17
External Alarm Type
Read & Write; Codes: 0 = Alarm on Every Trip; 1 = Alarm When
Lockout Occurs; 2 = Alarm When a Trip Occurs After the Previ-
ous Lockout Has Been Reset.
18
Issue Manual Reset
Write Only; 1 = Yes
o
r 0 = No
19
Number
of Trips Since Last Manual
Reset
Read Only; Range = 0 to Maximum Selected Number Of Auto-
Resettable Trips.
20
Current In Phase A
Read Only;
Range =
0 to 440 Amps (All values times 10)
21
Current In Phase B
Read Only;
Range =
0 to 440 Amps (All values times 10)
22
Current In Phase C
Read Only;
Range =
0 to 440 Amps (All values times 10)
23
Present
Exhaust Temperature
Read Only;
Range =
8
0
°
F
to 300
°
F or 100 - 20K Ohms
24
Present
Oil Temperature
Read Only;
Range =
2
0
°
F
to 200
°
F or 200 - 20K Ohms
25
Last Trip Type
Read Only; Codes: 0 = None; 1 = Current; 2 = Phase Imbalance;
3 = Exhaust Temp High; 4 = Oil Temp High; 5 = Modbus Initi-
ated Trip; 6 = Phase Order Incorrect; 7 = Oil Temp Low;
8 = Exhaust Sensor Bad; 9 = Oil Sensor Bad.
26
Last Trip Value
Read Only; Units in Amps, or % Phase Imbalance, or
°
F
(All values times 10).
27
Time Since Last Trip
Read Only; Range = 0 to 32,000 Hours.
28
Monitor Tripped
Read Only;
1 = Yes or
0 = No.
29
Time Until Trip Will Auto Reset
Read Only; Range = 0 to 255 Minutes
30
Initiate Restore to Factory Settings
Write Only; 1 = Yes or 0 = No
31
Phase Imbalance Delay
Read & Write; Range 4 to 60 (in 1/2 sec units, 2 - 30 seconds)

15
(page 13) to connect the exhaust sensor's wires to the
EXHS+
and
EXHS-
terminals on the Model 610. Either exhaust sensor wire
c
an be connected to either of the EXHS+ or
EXHS
-
terminals.
5
)
When using two (2) Model 610 Digital Current Monitors
for the Dual Model 610 Part (Split) Winding Motor installation,
wire
the exhaust sensor wires to
either
of
the
#1
and
#2
Model 610
EXHS+
and
EXHS-
terminals
.
NOTE:
In this case, the
#1
and
#2
Model 610's Modbus RTU
addresses will be different. Therefore,
both
the
#1
and
#2
Model
610's register data, excluding the Modbus addresses,
must
be iden-
must be iden-must
tical.
6
)
Refer to the
Sequence of Operation
section, steps 8 thru 13
(page 17) for selecting the exhaust sensor's
temperature
trip value
.
7)
This completes the
Model 610's exhaust sensor hardware
installatio
n
.
1
.
Select a mounting configuration that provides a safe and
reliable temperature signal for the application. Always select a
temperature sensor that exceeds the highest and lowest expected
oil temperature(s). When available, select a wire length longer than
required for the application.
2.
If additional wire is needed, use 22AWG (minimum) shielded
stranded, twisted pair cable properly insulated for the application.
The maximum length of additional
22AWG
wire is 75 feet. For
longer distances, consult factory.
3
.
Follow the oil temperature sensor manufacturer's instructions
and recommendations when installing the oil sensor on / in the
compressor's crankcase.
4
.
After mounting the sensor, refer to
Figure 7,
Model 610
Exhaust Sensor, Oil Sensor and Modbus Wiring Diagram
(page
13)
,
to connect the oil sensor's wires to the
OIL+
and
OIL-
termi-
nals on the Model 610. Either sensor wire can be connected to
either of the OIL+ or OIL- terminals.
5
)
When using two (2) Model 610 Digital Current Monitors for
the Dual Model 610 Part (Split) Winding Motor installation,
wire
the oil sensor wires to
either
of
the
#1
and
#2
Model 610
OIL
+
and
OIL
-
terminals
.
NOTE:
In this case, the
#1
and
#2
Model 610's Modbus RTU
addresses will be different. Therefore,
both
the
#1
and
#2
Model
610's register data, excluding the Modbus addresses,
must
be iden-
must be iden-must
tical.
6
)
Refer to the
Sequence of Operation
section (pages 17 & 18),
steps 14 thru 31 for selecting the oil sensor's
temperature
trip value
.
7
.
This completes the
Model 610's oil sensor hardware installa-
tio
n
.
Modbus RTU Installation
1
)
Referring to
Figure
7,
Model 610 Exhaust Sensor, Oil
Sensor and Modbus Wiring Diagram,
(page 13) connect the
Model 610's "
MOD
A
", "
MOD
C
" and "
MOD
B
" terminals to the
Modbus RTU connection
.
NOTE:
The Model 610's Modbus terminals are defined as:
MOD
A
=
A = A
TX
+
,
MOD
C
=
G
ND
,
MOD
B
=
TX
-
2)
When using two (2) Model 610 Digital Current Monitors for
the Dual Model 610 Part (Split) Winding Motor installation,
wire
the Modbus RTU connection to
both
sets of
the
#1
and
#2
Model
610
"
MOD
A
", "
MOD
C
" and "
MOD
B
" terminals
.
NOTE:
In this case, the
#1
and
#2
Model 610's Modbus RTU
addresses will be different. Therefore,
both
the
#1
and
#2
Model
610's register data, excluding the Modbus addresses,
must
be
must be must
identical.
3)
This completes the
Model 610's Modbus hardware installa-
tio
n
.
Before turning on power:
1)
Verify (double check) all Model 610 controller(s) and motor
contactor(s) motor (load) wiring.
2)
Disable the motor contactor's ability to activate, by
t
empo-
rarily
removing and protecting the
rarily removing and protecting the rarily
24 VAC motor contactor's coil
wire connected to the
N.C.
terminal on the Model 610's
TRIP
relay or
#1
Model 610's
TRIP
relay if using two (2) Model 610s
.
3
)
Apply 24 VAC power to the controller(s) and line power to
the motor contactor(s). Verify the motor contactor(s) do not ener-
gize the motor. Also verify the LCD screen shows 0.0 amps.
4
)
Turn off both the controller's 24 VAC power
and line power
to the motor contactor(s).
5
)
Reconnect
the
motor contactor(s)'
24 VAC
TRIP
relay wire
(removed in step 2 above)
to the
TRIP
relay's
N.C.
terminal.
6
)
Apply 24 VAC power to the single Model 610 controller or,
when used, both the
#1
and
#2
Model 610 controllers.
7)
Apply line power to the motor contactor(s).
8
)
If the motor being protected has an FLA greater than 10
amps, verify the red
TRIP
LED comes on, within the number of
seconds specified in
TABLE 7
's "
Time To Trip"
column (page
14), and that the motor contactor(s) has / have disconnected line
voltage to the motor(s).
9
)
Verify
the motor stops and
the LCD indicates
TRIPPED
.
10
)
If the motor's FLA is greater than 10 amps a
nd the
motor
contactor
did not
disconnect line voltage to the motor
,
disconnect line voltage to the motor, disconnect line voltage to the motor
t
urn off
the line voltage going to the motor contactor(s) and verify the
motor turns off. Then go to step 13 on page 16.
11)
The 610's LCD display should indicate
the type of trip
that occurred. If the trip was due to over current, then the Model
610 Control(s) and motor contactor(s) wiring has been installed
correctly and both devices are working properly.
12)
If the controller tripped due to any other reason, such
Exhaust Temperature Sensor
Installation Con't
Initial Checkout Procedure
Oil Temperature Sensor
Installation

16
as phase imbalance, phase order, or temperature out of range,
correct the problem(s) before re-applying line voltage to the motor
contactor(s).
13)
R
efer to this I&O's
Refer to this I&O's R
Installation
section (on pages 3 thru 9
and 12 thru 15) and
the appropriate wiring diagram(s)
to
trouble
shoot and correct the problem(s) that allowed the motor to keep
running after a
TRIP
occurred. After each repair, the installer
must
repeat this entire
Initial Checkout Procedure
section (pages
16 - 19) to ensure the repair fixed the problem(s).
14)
Once the Model 610 Digital Current Monitor(s) and motor
contactor(s) is /are working correctly, the installer can
c
hange the
current trip level to the desired value for the application, (typi-
cally motor FLA + 8% [
FLA
times
FLA times FLA
1.08
). See steps 1 thru 5 in the
“
Sequence of Operation
” section (pgs 16 & 17) for the procedure.
You may now manually reset the Over Current Trip by pressing
the
MODE
button once and then the
MODE button once and then the MODE
ENTER
button once.
ENTER button once.ENTER
If a three (3) phase motor runs backwards, the installer must
turn off line power to the motor and 24 VAC to the Model 610,
then swap the
L1
and
L2
wires going to the motor and also swap
the
CT1
+
and
CT2
+
wires at the Model 610’s terminal block.
NOTE:
Phase order verification can be turned off, using the
menu system. Refer to the
Sequence of Operation
section (pages
16 & 17)
,
steps 1 thru
7
, for the details
The two
Model 610 Digital Current Monitors, P/N Model
610-1PH(MOD) & P/N Model 610-3PH(MOD)
contain a
Modbus Slave that responds to a Modbus Master, which can send
requests to read the Model 610's internal register data or write
new data into the 610's internal registers. The Modbus connection
to the controller is an industry-standard three wire Modbus RTU
(Remote Terminal Unit) RS-485 serial data link that can be shared
with other modbus capable controllers and sensors.
T
here are 32 Modbus internal data registers (numbered 0 - 31)
available in this controller, as listed in
Tables 6A & 6B
,
Model
610 Modbus Register Data Information,
on pages 13 & 14. Each
Modbus register contains 16 data bits which can be updated using:
•
Modbus command 03, to read the data from one or more,
of the 610's internal data registers at a time.
•
Modbus command 16 (hexadecimal 10), to write data to
one or
more
of the
internal data registers at a time.
•
Modbus command 06, to write data to a single internal
data register.
To update any or a
ll of the Model 610 Digital Current Mon-
itor's mode, menu and submenu parameters and numerical
values
remotely, proceed with the following steps
:
• Set MODBUS RTU
slave
address, baud rate and parity for
each
Model 610
slave installed.
•
Write to each slave using the
TABLE
6A & 6B
informa
tion (pages 1
3
& 1
4
) to select the
Model
610
's internal
register numbers and associated data, as required, to set up
the
Model 610
monitor
's operating parameters and numer
ical
values
.
•
Allow
the
Allow the Allow
Model 610
to
operat
e
for a brief period of time
before reviewing all the data contained in the 32 internal
registers
, to ensure correct operation.
The default Modbus settings, stored within the controller, are:
• Modbus slave address = 1.
• Baud rate = 19200.
• Even parity.
Refer to
Figure 6
,
the "
Model 61
0
Menu System Flow Chart
"
on pages
10 & 11
, or follow the steps below to review or update
any or all the parameters and numerical values used by the Model
610. All settings and values are stored and saved within the control-
ler's memory.
1.
With line power, to the motor contactor, turned off and with
24VAC power applied to the Model 610
controller
:
• Verify no error messages are displayed on the LCD.
•
Verify t
he LCD screen shows
0.0
amps.
2.
Press the
MODE
button twice. The display should indicate
MODE button twice. The display should indicate MODE
“
Current Trip Settings
.”
3.
Press the
ENTER
button. The display should indicate
ENTER button. The display should indicate ENTER
“
Number of Phases
.”
4.
Use the
UP
and
DOWN
buttons to select the number of
current transformer phases that are connected to the controller.
Range is
"
3 Phase",
"Single Phase"
or
"
0 Phase; Temp only"
. Use
"
0 Phase; Temp only
"
when
only
temperature sensing is desired.
Then press the
ENTER
button. The default is
ENTER button. The default is ENTER
3
P
hase
.
5.
The display should read: “
Set Trip Level in Amps
”. Use the
Sequence of Operation
Initial Checkout Con't
IMPORTANT:
If any of the down loaded Modbus data is incorrect, the
Model 610 Digital Current Monitor's microcontroller
will change the incorrect data into software selected
default values during the Model 610's next operating
cycle. Therefore, after updating any data remotel
y,
cycle. Therefore, after updating any data remotely,cycle. Therefore, after updating any data remotel
th
e
operator
MUST
allow the Model 610 to operate
for a
brief time period
before reviewing ALL of the data con-
brief time period before reviewing ALL of the data con-brief time period
tained in each of the
Model 610
's
3
2
register addresses
to 1) ensure that all of the operating parameters and
numerical values, needed for the application, have been
correctly selected and 2) also ensure that any unneeded
or undesired options or numerical values have not
inadvertently been left selected.
�
NOTE:
Phase imbalance can be caused when single phase
loads are not distributed evenly throughout a 3
phase power network.
Modbus RTU Operation

17
Sequence of Operation Con't
UP
and
DOWN
buttons to select a trip current appropriate for
the application. Range is
5.0 to 200
amps in
0.
5
amp increments
between
5
.0
and
2
5
amps and in
1.0
amp increments between
25
and
200
amps.
The default is
10.0
amps.
The current trip value is determined by selecting the
allowed overcurrent percentage and using the following formulas:
To calculate
the trip value for an 8% over current, to protect a
motor with an FLA of 6.5 amps:
O
vercurrent Ratio
= (8% + 100%) / 100 = 1.08
Trip Value
= 1.08 times 6.5 amps = 7.02 amps.
Use a trip value of 7.0 amps.
Press
the
ENTER
button after selecting the
ENTER button after selecting the ENTER
Trip Level in Amps
.
6.
If you selected the
3 Phase
option, in step 4 above, the next
display will be “
Phase Imbalance Allowed
”. Use the
UP
and
DOWN
buttons to choose a percent phase imbalance ranging
from 2% to 100%. Press the
ENTER
button when correct. The
ENTER button when correct. The ENTER
default is 12%.
7.
The next display will be "
Phase
Imbalance Delay: 3.0 sec
".
Phase Imbalance Delay provides an operator selectable time delay
before the Model 610's
Phase Imbalance
will trip. This is espe-
cially useful during part (split) winding motor startup. The time
delay
can be varied from 2.0 to 30.0 seconds in 0.5 second
steps.
Use the
UP
and
DOWN
buttons to choose a phase imbalance
delay time. Press the
ENTER
button when correct.
ENTER button when correct. ENTER
The default
delay is 3.0 seconds.
8.
If you selected the
3
phase
option in step 4 above, the next
display will be “
Check Phase Order?
” When selected,
p
hase order
is verified each time line voltage is applied to the load. The time
delay selected in the
Phase Imbalance Delay
menu above, is used
Phase Imbalance Delay menu above, is used Phase Imbalance Delay
as the delay time employed before phase order is checked. Use the
UP
and
DOWN
buttons to select “
Yes
” or “
No
” and press the
ENTER
button. The default is "
ENTER button. The default is "ENTER
Yes
".
9
.
The menu should have returned to the Home Screen. Now
press the
MODE
button three times. The display should indicate
MODE button three times. The display should indicate MODE
“
Temperature Trip Settings
”.
10
.
Press the
ENTER
button. The display should indicate “
ENTER button. The display should indicate “ENTER
Use
Exhaust Temp?
” Use the
UP
and
DOWN
buttons to choose “
Yes
”
or “
No
” and press the
ENTER
button. The default is
ENTER button. The default is ENTER
“
No
”.
11.
If you selected “
Yes
” in the previous step, the next display
will be "
Exh Sensor Type
". Use the
UP
and
DOWN
buttons
to
choose the type of sensor
used. The range is "
Omega 10K
"
,
"
PTC
"
or "
NTC
"
. Then press the
ENTER
button. The default is
ENTER button. The default is ENTER
"
Omega 10K"
.
12.
If you selected "
Omega10K
" in step
1
1
above, the next
screen will be "
Exhaust Trip Val
". Use the
UP
and
DOWN
buttons to select the desired high temperature exhaust trip value
in
°
F
. The range is
F. The range is F
80
°F
to
300°F
. Press the
300°F. Press the 300°F
ENTER
button to save
ENTER button to save ENTER
the value. The default is "
225
"
13.
If you selected "
PTC
"
in step
1
1
above, the next display
will be "
Exhaust Trip Val
"
in "
Ohms"
.
Use the
UP
and
DOWN
buttons to select the desired high temperature exhaust trip resis-
tance value in ohms.
The range is
100 Ohms t
o
20.0K
Ohms
20.0K Ohms 20.0K
.
Press the
ENTER
button to save the value. The default is "
ENTER button to save the value. The default is "ENTER
100
0
"
14.
If you selected "
N
TC
"
in step
1
1
above, the next display
will be "
Exhaust Trip Val
"
in "
Ohms"
.
Use the
UP
and
DOWN
buttons to select the desired high temperature exhaust trip resis-
tance value in ohms.
The range is
100 Ohms to
20.0K
Ohms
20.0K Ohms 20.0K
.
Press the
ENTER
button to save the value. The default is "
ENTER button to save the value. The default is "ENTER
100
0
"
15.
If you selected "
No
" in step
10
above, the
display will now
indicate “
Use Oil Temp?
”
Use the
UP
and
DOWN
buttons to
choose “
Yes
” or “
No
” and press the
ENTER
button. The default
ENTER button. The default ENTER
is
“
No
”.
16.
If you selected "
No
" in the previous step, the menu should
have returned to the Home Screen. Now press the "
MODE
"
button four (4) times. The display should indicate "
Trip Auto
Reset and Alarm
". Go to step
3
4
, on page 18,
to continue with
the next display.
17.
If you selected "
Yes
" in step 15 above, the next display will
be "
Oil Sensor Type
". Use the
UP
and
DOWN
buttons to
choose
the type of sensor
used. The range is "
Omega10K
"
, "
PTC
"
or
"
NTC
"
. Then press the
ENTER
button. The default is
ENTER button. The default is ENTER
"
Omega
10K
".
18.
If you selected "
Omega10K
" in step
1
7
above, the next
screen will be "
Oil
Trips On?
". Use the
UP
and
DOWN
buttons
to select
"
High
",
"
Low
" or
"
Both
"
high and low
temperature trip
high and low temperature trip high and low
values in
°
F
. Press the
F. Press the F
ENTER
button to continue. The default is
ENTER button to continue. The default is ENTER
"
Both
".
19.
If you selected "
High
" temperature in the previous screen,
the next display will be "
Set Oil High Trip
" in
°
F
.
F. F
Use the
UP
and
DOWN
buttons to select the desired high oil trip temperature
value in
°
F
.
F.F
The range is
2
0
°F
to
200°F
. Press the
200°F. Press the 200°F
ENTER
button
ENTER button ENTER
to save the value.
The default is "
175
"
20
.
If you selected "
Low
" temperature in step
1
8
above,
the next
display will be "
Set Oil Low Trip
" in
°
F
.
F. F
Use the
UP
and
DOWN
buttons to select the desired low oil trip temperature value in
°
F
.
F.F
The range is
2
0
°F to
200°F
. Press the
200°F. Press the 200°F
ENTER
button to save the
ENTER button to save the ENTER
value.
The default is "
6
0
"
21.
If you selected "
Both
" high and low temperature trip points
in step
1
8
above,
the next display will be "
Set Oil High Trip
" in
°
F
.
F. F
Use the
UP
and
DOWN
buttons to select the desired
high
oil
trip temperature value,
in
°
F
.
F. F
T
hen press the
ENTER
button. The
ENTER button. The ENTER
default is "
175
".
22.
The next display should be "
Set Oil Low Trip
" in
°
F
.
F. F
Use
the
UP
and
DOWN
buttons to select the desired low oil trip
temperature value in
°
F
.
F.F
The range is
2
0
°F to
200°F
. Press the
200°F. Press the 200°F
ENTER
button to save the value.
ENTER button to save the value. ENTER
The default is "
6
0
".
23.
If you selected "
PTC
"
in step
1
7
above,
the next display will
be "
Oil Trips On?
".
Use the
UP
and
DOWN
buttons to select
"
High
", "
Low
" or "
Both
" high and low temperature trip values
in ohms (resistance)
.
Press the
ENTER
button to continue.
ENTER button to continue. ENTER
The
default is "
Both
".
24.
If you selected "
High
"
in the previous test step,
the next
display will be "
Set Oil Hi Trip
" in "
Ohms"
.
Use the
UP
and
Ovorcurrent Ratio = (
overcurrent percentage + 100%
)
divided by 100
.
Trip Value =
Overcurrent Ra
tio times motor's FLA
.

18
Sequence of Operation (con't)
DOWN
buttons to select the desired high oil trip temperature
value in ohms
(resistance)
.
The range is
200 Ohms to
20.0K
Ohms
. Press the
ENTER
button to save the value. The default is
ENTER button to save the value. The default is ENTER
"
200
0
" ohms.
25.
If you selected "
Low
"
in test step
2
3
above,
the next display
wi
ll be "
Set Oil Low Trip
" in "
Ohms"
.
Use the
UP
and
DOWN
buttons to select the desired low oil trip temperature value in ohms
(resistance)
.
The range is
200 Ohms to
20.0K
Ohms
. Press the
ENTER
button to save the value. The default is "
ENTER button to save the value. The default is "ENTER
200
0
" ohms.
26.
If you selected "
Both
" high and low temperature trip points
in step
2
3
above,
the next display will be "
Set Oil Hi Trip
" in
"
Ohms"
.
Use the
UP
and
DOWN
buttons to select the
high oil
trip temperature value in
ohms
(resistance) and then press the
ENTER
button. The default is "
ENTER button. The default is "ENTER
200
0
" ohms.
27.
The next display should be "
Set Oil Low Trip
" in "
Ohms"
.
Use the
UP
and
DOWN
buttons to select the desired low oil trip
temperature value in
ohms.
The range is
200 Ohms to
20.0K
Ohms (resistance)
.
Press the
ENTER
button to save the value.
ENTER button to save the value. ENTER
The
default is "
200
0
" ohms.
28.
If you selected "
N
TC
"
in step
1
7
above,
the next display
will be "
Oil Trips On?
".
Use the
UP
and
DOWN
buttons to
select "
High
", "
Low
" or "
Both
" high and low temperature trip
values in ohms (resistance)
.
Press the
ENTER
button to continue.
ENTER button to continue. ENTER
The default is "
Both
".
29.
If you selected "
High
"
in the previous test step,
the next
display will be "
Set Oil Hi Trip
" in "
Ohms"
.
Use the
UP
and
DOWN
buttons to select the desired high oil trip temperature
value in ohms (resista
nce)
.
The range is
200 Ohms to
20.0K
Ohms
. Press the
ENTER
button to save the value.
ENTER button to save the value. ENTER
The default is
"
200
0
" ohms.
30
.
If you selected "
Low
"
in test step
2
8
above,
the next display
will be "
Set Oil Low Trip
" in
Ohms
.
Use the
UP
and
DOWN
buttons to select the desired low oil temperature trip value in
ohms
.
The range is
200 Ohms to
20.0K
Ohms (resistance)
. Press
the
ENTER
button to save the value.
ENTER button to save the value.ENTER
The default is "
200
0
" ohms.
3
1
.
If you selected "
Both
" high and low temperature trip points
in step
2
8
above,
the next display will be "
Set Oil Hi Trip
" in
"
Ohms"
.
Use the
UP
and
DOWN
buttons to
set the high oil trip
temperature value in ohms and then press the
ENTER
button.
ENTER button. ENTER
The default is "
200
0
" ohms.
3
2
.
The next display should be "
Set Oil Low Trip
" in "
Ohms"
.
Use the
UP
and
DOWN
buttons to select the desired low oil trip
temperature value in
ohms (resistance).
The range is
200 Ohms
to
20.0K
Ohms
.
Press the
ENTER
button to save the value.
ENTER button to save the value. ENTER
The
default is "
200
0
" ohms.
3
3
.
The menu should have returned to the Home Screen. Press
the
MODE
button four (4) times.
MODE button four (4) times.MODE
34.
The display should indicate: “
Trip Auto Reset and Alarm
”.
35 Press the
ENTER
button.
ENTER button.ENTER
The display should indicate “
#
Trips Until Manual Reset:
” Use the
UP
and
DOWN
buttons to
select a number (range is
0 to 255
) then press the
ENTER
button.
ENTER button. ENTER
The default is "
3
".
36.
The display will indicate “
Auto Reset Delay Time
”. Use the
UP
and
DOWN
buttons to select between
0 to 255
minutes and
press the
ENTER
button. The default is "
ENTER button. The default is "ENTER
5
" minutes.
3
7
.
The display should indicate “
Extern Alarm When
”. Use the
UP
and
DOWN
buttons to select one of the following options:
“
Tripped
” – The external alarm is activated whenever the
control is tripped.
“
No Manual Reset
” – The external alarm is activated when at
least one trip occurs without a manual reset being performed.
“
Man Reset Required
” – The external alarm is only activated
if the control is in lockout and a manual reset is required.
The default is
“
Tripped
”.
Press the
ENTER
button after
ENTER button after ENTER
making
your selection.
3
8
.
The menu should have returned to the Home Screen. Press
the
MODE
button five (5) times. The display should indicate
MODE button five (5) times. The display should indicate MODE
“
Modbus Settings
”. If you are not using the Modbus for remote
control, press the
MODE
button, once more, and go to step
MODE button, once more, and go to step MODE
4
2
.
3
9
.
Press the
ENTER
button. The display should indicate “
ENTER button. The display should indicate “ENTER
Set
Modbus Address
”. Use the
UP
and
DOWN
buttons to select a
Modbus slave address for this controller. The range is
1- 247
, then
press the
ENTER
button. The default is "
ENTER button. The default is "ENTER
1
".
40
.
The display should indicate “
Modbus Baud Rate
”. Use the
UP
and
DOWN
buttons to select the desired baud rate. When
remotely setting the baud rate value, a number code, from 0 to 7,
is used. Refer to
TABLE 8, Baud Rate Codes
below, to view the
available Model 610 baud rates and their associated number codes
.
The default baud rate is
19200
.
Press the
ENTER
button after
ENTER button after ENTER
making your selection
.
Code
Baud Rate
Code
Baud Rate
0
1200
4
19200
1
2400
5
38400
2
4800
6
57600
3
9600
7
115200
Baud Rate Codes
TABLE
8
4
1
.
The display should indicate “
Modbus Parity
.” Use the
UP
and
DOWN
buttons to select the correct parity used by the
Modbus RTU master computer
. The choices are "
even parity,
no
parity
or
odd
parity
"
.
Press the
ENTER
button after making your
ENTER button after making your ENTER
selection.
The
default is "
even parity
."
4
2
.
The display should indicate “
Reset Control to Factory
Sets?
” The default is “
No
.” Press the
ENTER
button.
ENTER button. ENTER
IMPORTANT:
If you select “
Yes
” and press the
ENTER
b
utton, all the Model 610 Digital Current Monitor's parameters
are reset to the following factory default settings shown below:
• 3 Phase monitoring.
• Trip Level = 10.0 amp.
• Exhaust and Oil temperature sensors are not used.
• Lockout occurs when the 3
rd
trip occurs.
• Auto reset delay = 5 minutes.
• Modbus slave address = 1.

19
To calculate
an 8% over current trip value for the 2 amp motor
above:
O
vercurrent Ratio = (8% + 100%) / 100 = 1.08
Trip Value = 1.08 times 2 amps times 3 wire loops = 6.48 amps.
Use a trip value of 6.5 amps.
1)
The speed at whi
ch the LCD screen's values change is
variable. Holding the
UP
or
DOWN
button down
causes the
displayed value to change slowly at first and th
en speed up notice-
ably. When making large value changes hold the button down
until the displayed number is close to the desired value. Then
release the button, wait 1 second, and press the button down again
to slowly reach the desired value.
2) Figures 8a & 8b
below show a summary of the unique push
button presses, and their results, that are available on the Digital
610 when the Home Screen is present on the LCD.
Figure 8a
Pressing the
UP
push button, as shown in
Figure 8a
,
causes the
LCD screen to display
the following information about the last
trip that occurred:
1)
The trip type (current, phase imbalance, temp high, temp
low, phase order etc.) or;
2)
The value that caused the trip, and the time in hours since
the last trip occurred (up to 32,000 Hrs.) or;
3)
The stored current values, for all three phases, that caused a
phase imbalance during motor startup.
Figure 8b
Pressing
the
DOWN
button, as shown in
Figure 8
b
,
causes the
LCD screen to display, in real time, all three phase currents in
amps, and both sensor
temperatures in
°
F (or Ohms)
, even when
the
y are not being used (installed) or have not been selected
. The
unused phase currents and temperature sensor values are displayed
as "
0
".
•
Modbus baud rate = 19200.
• Modbus parity = even.
This completes the setup of all control parameters.
Reconnec
t
any previously removed wires
, apply 24 VAC power
to the Model 610 Digital Current Monitor(s) and
line power to
the motor contactor(s). Observe the LCD screen and the motor's
operation:
• Verify the current displayed
on the Model 610's LCD screen
matches the motor's nominal FLA current.
• If the exhaus
t and / or oil temperature sensors are used in
this application
, verify the temperatures displayed on the LCD
screen match the measured exhaust / oil temperatures recorded by
the installer (using an appropriate temperature sensing device).
•
If the system works correctly, no operational updates are
needed.
•
If the system does not work correctly, determine the specific
cause for the anomaly and fix it. When the anomaly's solution
involves an update to the Model 610 Digital Current Monitor's
parameters, follow the
Sequence of Operation
section instruc-
tions (pages 16 thru 19) to update the specific parameter(s) needed
to achieve the best possible system operation. After any update(s)
or repairs have been made, observe the entire system's operation
again, to verify the update(s) or repairs worked.
For motors drawing less than 5 amps, each motor's power wire
can be looped through its associated CT(s) a number of times
(depending on wire diameter to increase the sensed current. When
using more than one (1) CT, loop power wires through each CT
the same number of times.
Important:
Adjust the current trip value accordingly.
For example:
A single phase motor with an FLA of 2.0 amps, can be
protected with a Model 610 Digital Current Monitor, by looping
one of the motor's power wires, through the 1/2 inch diameter
hole in the CT, three (3) times (depending on the wire's diameter).
In this case, the Model 610 will sense the motor's FLA as 6 amps
(3 wire loops times the 2 amp FLA current).
The current trip value is determined by selecting the
allowed overcurrent percentage and using the following formulas:
Sequence of Operation (con't)
Motor & Operating Tips
Motor
Tip
Motor TipMotor
Operating
Tip
Operating TipOperating
Final Checkout Procedure
Overcurrent Ratio = (
overcurrent percentage + 100%
)
divided by 100
.
Trip Value =
Overcurrent Ra
tio
times
motor's FLA
times
3 (wire loops)
.



Hoffman
|
Controls
2463 Merrell Road, Dallas, Texas 75229 • Phone: [phone] • Fax: [phone] • Toll Free: 1-888-HCC-1190
www.hoffmancontrols.com Form: 173-0263-001 Rev. C01
Troubleshooting Guide
1.
Check wiring, review instructions.
2.
Use
Table 7,
Time to Trip Chart
to look
to look
Time to Trip Chart to look Time to Trip Chart
up the trip time and verify motor turns
off appropriately. If not, replace control.
3
.
Orient all transformers identically.
4
.
Check and correct wiring.
1
.
Check wiring / replace transformer(s).
2.
Orient all transformers identically.
3.
Check and correct wiring
4.
Replace control.
1.
Use correct temperature sensor
.
2.
Select correct temperature sensor option.
Select correct temperature sensor option.
3
.
Use correct temperature value.
1.
Turn on 24 VAC.
2
.
Replace 24 VAC transformer.
3
.
Cycle 24 VAC power and recheck.
4
.
Replace control.
Current Trip Not
Occurring
Home Screen
Shows Incorrect
or Zero Amps
Value
Temperature Trip
Fails to Occur
1.
Trip relay
N.C.
and
COM
terminals not wired correctly.
2.
Displayed current not staying above the current trip value long
enough for the excess motor energy to rise to the equivalent of a
locked rotor for 2 seconds.
3.
Current transformers not oriented correctly
.
Current transformers not oriented correctly. Current transformers not oriented correctly
4
.
Current transformers not wired correctly.
1.
Current transformer(s) not connected or bad.
2.
Current transformers not oriented correctly
.
Current transformers not oriented correctly.Current transformers not oriented correctly
3.
Current transformer(s) incorrectly wired
.
4.
Control is bad.
1.
Temperature sensor is not an R - T type thermistor sensor.
2.
Incorrect temperature sensor option selected (
Omega
10K
,
PTC
or
NTC
).
3
.
Incorrect temperature selected (
°
F or ohms
)
1.
Power not turned on.
2
.
Bad 24 VAC transformer
.
3
.
Microcontroller is hung up (
paused)
.
4
.
Control
is bad.
LCD Screen is
Blank
Condition
Cause
Solution
Condition
Motor
Does Not
Motor Does Not Motor
Run
1.
Check and correct wiring.
2.
Correct power wiring.
3
.
Determine lockout cause, fix problem
and reset control.
4
.
Determine why overload occurred and
correct problem.
1.
Motor not wired correctly.
2.
Phase rotation incorrect
.
3
.
Control locked out
.
4
.
Motor off on internal overload.