SymCom 777-575-FT User manual

INSTALLATION INSTRUCTIONS
FOR SYMCOM’S OVERLOAD RELAY
MODEL 777-575-FT
BE SURE POWER IS DISCONNECTED PRIOR TO INSALLATION!
FOLLOW NATIONAL, STATE, AND LOCAL CODES!
READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION!
SymCom’s electronic overload relays are fully programmable for customized
protection with a digital readout and RS-485 communications. The 777-FT also
has a fast linear trip mode.
2880 North Plaza Drive, Rapid City, SD 57702 • [phone]
CONNECTIONS
1. Using the four corner tabs or the DIN rail mounting bracket, mount the
unit near the magnetic contactor. To use the DIN rail bracket,
hook the top clip rst, then apply downward pressure until the lower clip
“clicks” onto the rail.
2.1 For amperages from 26-90 amps, insert the motor conductors from the top of
the unit through the holes marked ‘A’, ‘B’, and ‘C’. Make certain that the
conductor through each hole corresponds to the right motor conductor (i.e.
the ‘A’ phase conductor should go through the ‘A’ round hole). See Figure 1
for a typical wiring diagram.
2.2 For amperages less than 26 amps, loop the motor conductors according to
Table 1. Figure 2 shows an example of the looping required for current ranging
from 8.1 to 12 amps (MULT=3).
2.3 For amperages greater than 90 amps, external CT’s (current transformers)
are required. SymCom recommends CT’s with terminals be used for ease of
installation. All CT secondaries must make ve passes through the round
holes on the MotorSaver. See Figure 3 for a typical wiring diagram using
external CT’s.
NOTE: Pay close attention to the diagrams to eliminate any power factor
errors.
3. Connect the three phase power from the line side of the contactor to ‘L1’, ‘L2’,
and ‘L3’ terminals using 12-18AWG copper wire.
4. Connect the control circuit wires to the appropriate terminals. The relay is a
fail safe design so the ‘NO’ contact should be in series with the coil on the
contactor for motor control (see Figure 4). For alarm circuits, the ‘NC’ contact
is in series with the alarm circuitry (not shown).

07/25/03 -2-
CONTROL POWER 277 VAC OR LESS
DISPLAY / PROGRAM
L3-L1
L
B
E
+
O
V
AVG
T
L1-L2
L2-L3
C
N
T
C
E
A
A
G
AVG
R
R
U
RD2 UCTD
CUB LV
MULT
UC
OC HV
VUB
RD1
TC GF
RUN
#RU / ADDR
RD3 #RF
MODE SELECT
L1 L2 L3 NO C NC
MODEL 777-FT
OVERLOAD RELAY
LOW RANGE, 20-90 AMPS
DISPLAY MESSAGE
RESET/
PROGRAM 800-843-8848SYMCOM, INC. RAPID CITY,SD
FIGURE 1: TYPICAL WIRING DIAGRAM FOR 26-90 FLA
FULL LOAD AMPS NUMBER OF
LOOPS
NUMBER OF
CONDUCTORS
THROUGH A, B, and C
MULT PROGRAM
SETTING
2.0 - 2.5 9 10 10
2.6 - 3.0 8 9 9
3.1 - 3.5 7 8 8
3.6 - 4.0 6 7 7
4.1 - 5.0 5 6 6
5.1 - 6.0 4 5 5
6.1 - 8.0 3 4 4
8.1 - 12 2 3 3
13 - 25 1 2 2
26 - 90 0 1 1
EXTERNAL CTs REQUIRED. SEE FIGURE 2 FOR WIRING EXTERNAL CTs.
91 - 110 4 5 100 (100:5 CT)
111 - 160 4 5 150 (150:5 CT)
161 - 220 4 5 200 (200:5 CT)
221 - 320 4 5 300 (300:5 CT)
321 - 420 4 5 400 (400:5 CT)
421 - 520 4 5 500 (500:5 CT)
521 - 620 4 5 600 (600:5 CT)
621 - 800 4 5 800 (800:5 CT)
TABLE 1: WIRING CONFIGURATION BASED ON MOTOR FLA

FIGURE 2: LOOPING EXAMPLE SHOWING 3 CONDUCTORS (2 LOOPS) WITH A MULT OF 3
-3- 07/25/03
L1 L2 L3 NO C NC
MODEL 777-FT
OV ERL O AD RE LAY 20 -90 A
RESET/
PROGRAM
RD3 #RF
VUB
OC
#RU/ADDR
MULT
RD2 KWS
HV
LKW
RD1
CUB
GF
LV
TC RUN
DISPLAY / PROGRAM
MODE SELECT
L3-L1
L
E
+
O
V
AVG
T
L1-L2
L2-L3
N
T
C
E
A
A
G
AVG
R
R
U
B
C
KW
SUITABLE 10 KA RMS, 600 VAC MAX
SYMCOM INC. 800-243-8848 RAPID CITY, SD
¨
IND. CONT.EQ.
LISTED
784X
LR46510
L1 L2 L3 NO C NC
MODEL 777-FT
OVE RL OA D REL AY 20 -90 A
RESET/
PROGRAM
RD3 #RF
VUB
OC
#RU/ADDR
MULT
RD2 KWS
HV
LKW
RD1
CUB
GF
LV
TC RUN
DISPLAY / PROGRAM
MODESELECT
L3-L1
L
E
+
O
V
AVG
T
L1-L2
L2-L3
N
T
C
E
A
A
G
AVG
R
R
U
B
C
KW
SUITABLE 10 KARMS, 600 VAC MAX
SYMCOM INC. 800-243-8848 RAPID CITY, SD
¨
IND.CONT. EQ.
LISTED
784X
LR46510
-FT
190-480 VAC
277
FIGURE 4: TYPICAL CONTROL WIRING DIAGRAM
FIGURE 3: TYPICAL WIRING DIAGRAM USING EXTERNAL CTs

PROGRAMMING
1. Select the feature to program by
rotating the “MODE SELECT” switch
to the desired position. The “MULT”
setting must be programmed before
any of the current settings to ensure
proper display of actual current
setpoints. Therefore, SymCom
recommends programming the “LV”
setting rst, then move clockwise
through the postions to complete the
process.
2. Push and hold the RESET / PROGRAM button.
3. Rotate the DISPLAY / PROGRAM adjustment to the desired setting of the
feature as shown in the LED display.
4. Release the RESET / PROGRAM button. The unit is programmed when the
button is released.
5. Continue steps 1-4 until all features are programmed.
NOTE: Some “MODE SELECT” positions are dual function such as the
“#RU / ADDR” position. When the “MODE SELECT” switch is pointed
at “#RU / ADDR,” you may view and program “#RU” and “ADDR.” To
view the two settings rotate the “DISPLAY / PROGRAM” adjustment
across its entire range. You will see the “#RU” setting when the
“DISPLAY / PROGRAM” adjustment is between approximately 7 O’Clock
and 11 O’Clock. You will see the “ADDR” setting
when the “DISPLAY/PROGRAM”adjustment is between approximately
11 O’Clock and 5 O’Clock. To program “#RU” or “ADDR,” follow the
programming instructions above. The “#RU” setting will only be
programmed when the “DISPLAY / PROGRAM” adjustment is between
approximately 7 O’Clock and 11 O’Clock. Likewise, the “ADDR” setting
will only be programmed when the “DISPLAY/PROGRAM”adjustment is
between approximately 11 O’Clock and 5 O’Clock. “ADDR” settings will
be an “A” followed by a number between 1 and 99.
07/25/03 -4-
Operation
The relay operation of SymCom’s overload relay is a fail safe design. This
means when everything is within the limits programmed into the unit, the relay
will energize; the normally open (NO) contact will close and the normally closed
(NC) contact will open. Once the unit has been wired and programmed, the unit
is ready to operate. Turn the mode select to the “RUN” position. The display will
show “RUN” alternating with some number (the numbers displayed will be the
number corresponding to where the “DISPLAY/PROGRAM” knob is pointed). It
will do this for the amount of time programmed into “RD1”. After this time has
expired, the relay will energize (normally open will close and normally closed
contact will open). If something else is in the display, see the troubleshooting
section for more information. If the mode select is taken out of the “RUN”
position, the units relay will de-energize.
L1 L2 L3 NO C NC
MODEL 777-FT
OVERLOAD RE LAY
DISPLAY MES SAGE
RESET/
PROGRAM
+
V
O
L
T
A
G
E
C
U
R
R
E
N
T
RD3 #RF
VUB
OC
#RU/ADDR
MULT
RD2 UTCD
HV
UC
RD1
CUB
GF
LV
TC RUN
DISPLAY / PROGRAM
MODE SELECT
SYMCOM, INC. 800-843-8848 RAPID CITY, SD
IND. CON T. EQ
LISTED
786X
C
L1-L2
L2-L3
L3-L1
AVG
AVG
A
B
C

FAST LINEAR TRIP MODE
The Fast Linear Trip Mode provides an adjustable linear trip that can be used for
very quick or very slow trips. The Model 777-FT family offers superior protection
for sensitive motors, quick trips in test panels, and fast trips to protect high torque
systems.
When the Fast Linear Trip Mode is activated (TC = J00), two new parameters, Motor
Acceleration time and Over Current Trip Delay are viewed and programmed in the
RD1 and RD2 positions. The RD1 and RD2 setpoints are still valid, but can only be
viewed and programmed by setting the trip class to any other class other than J00.
Note: Ensure Trip Class is set appropriately when changing RD1, RD2, MA,
or OCTD.
When the Fast Linear Trip Mode is used, the restart delays (RD1, RD2, and RD3)
will be reduced by approximately 50%. Example: RD1 setting = 010; RD1 time = 5
seconds.
PROGRAMMABLE PARAMETERS
NOTE: The unit can be programmed prior to installation by applying
120VAC to terminals ‘L1’ and ‘L2’.
The programmable parameters are the values the user must program to pro-
vide the correct protection for the application. All parameters are actual values
except the “VUB” and “CUB’ settings, which are percentages. The range these
parameters can be programmed to is found in the specications at the end of the
manual.
LV/HV-The recommended settings for “LV” (low voltage) and “HV” (high
voltage) depend on many factors such as motor usage, motor size,
environmental factors and tolerance of the motor. The motor
manufacturer should be consulted for “HV” and “LV” settings.
However, the NEMA MG1 standard recommends that “LV” and “HV” be
set to no more than 10% of the motor’s nameplate voltage. The setting
can be determined by multiplying the motor’s nameplate voltage by the
recommended percent over and under voltage (eg. The motor name
plate voltage is 575 V. Set "LV" to 0.9 x 575 = 517 and "HV" to 1.1 x
575 = 632.
NOTE: “LV” can not be set higher than “HV”, so “HV” may have to be
adjusted higher before the proper “LV” setting can be programmed.
VUB- “VUB” is the voltage unbalance trip point. The NEMA MG1 standard
does not recommend operating a motor above a 1% voltage unbalance
without derating the motor. Voltage unbalance is determined from the
following formula:
THE FOLLOWING ARE GENERAL RECOMMENDATIONS. THE MOTOR
MANUFACTURUR SHOULD BE CONSULTED FOR EXACT SETTINGS.
-5- 07/25/03

Note: A setting of “999” in this position will disable single phasing and
voltage unbalance protection.
Percent Unbalance = Maximum Deviation from the Average
Average x 100
Example: The measured line-to-line voltages are 203, 210, and 212.
Average = 569 +572 +578
3=573
The maximum deviation from the average is the largest difference
between the average voltage (573) and any one voltage reading.
573 -569 =4 573 -572 = 1 578 -573 =5
The maximum deviation from the average is 5.
5
573x100=0.87% Unbalance
MULT- “MULT” is the multiplication factor for determining true current settings
based on current transformer ratio of external CTs. The appropriate
number can be determined from Table No. 1 on page 2. “MULT” must be
correctly programmed in order to accurately program the current settings.
OC- Represents the manufacturer’s maximum Service Factor Amperage (SFA).
The “OC” (overcurrent) setting depends on many factors such as motor
usage, motor size, environmental factors and tolerance of the motor. The
motor manufacturer should be consulted for “OC” settings. However, “OC”
is typically between 110% and 125% of Full Load Amperage (FLA).
UC- The “UC” (undercurrent) setting is typically set to 80% of full load
amperage (FLA). The overload relay with a “UC” setting of 80% of FLA
will typically detect a loss of load for many pumps and motors such as
a dry well condition for submersible pumps. The “UC” setting may be set
to 0.00 to disable undercurrent (loss of load) protection.
CUB- “CUB” is the current unbalance trip point. Most motor manufacturers
recommend operating under no more than 5% current unbalance,
therefore, a setting of “5” is a good place to start. However, your motor
manufacturer should be contacted for exact settings.
Note: Current unbalance is calculated the same way as voltage unbalance.
Note: A setting of “999” in this position will eliminate single phasing and
current unbalance protection.
TC- “TC” designates the trip class for overload protection. The trip class
defines the trip delay when an overload is detected. Trip class is
determined by the type of motor and application. Your motor manufacturer
should be consulted for the proper setting. Table No. 2 on page 9 shows
the trip class and a general description of the applications.
07/25/03 -6-

RD1- “RD1” is the rapid cycle timer. To view and adjust RD1, TC must not be
J00. It will engage when the motor is first powered-up or after the motor
controls shut down the motor. An “RD1” setting of 20-30 seconds will
generally protect the motor from rapid, successive power outages or short
cycling caused by the motor controls. A setting of 0 (zero) will allow the
motor to start immediately after power-up or after a normal shutdown.
Note: In linear trip mode (TC = J00), the RD1 time is appoximately 50% of
the normal RD1 time. Example: If RD1 is set to 10 seconds, the
TC = J00, then the actual RD1 time in the linear trip mode will be 5
seconds.
Note: Display increments by 2.
RD2- “RD2” is the restart delay after the overload relay trips on current unbalance,
single phasing, and overload (if “oc” is programmed in “#RF”). To view and
adjust RD2, TC must not be J00. This delay allows the motor to cool down
after experiencing the above faults. It is also known as a motor cool down
timer. Your motor manufacturer should be contacted to determine this
setting. Under normal circumstances, a setting of 30-60 minutes will give
the motor enough time to cool down between faults. The Motor
Manufacturer should be consulted for their recommendation.
MA- In linear trip mode (TC = J00), the RD1 position becomes the motor
acceleration time. To view and adjust MA, TC must be J00. The motor
acceleration time is related to the load on a motor. For high inertia loads
such as y wheels or conveyor systems, the motor acceleration time is
considerably longer than low inertia loads such as submersible pumps.
Therefore, “MA” is typically set higher for high inertia loads and lower for
low inertia loads. During the motor acceleration time, the linear overcurent
trip feature is ignored. Therefore, it is important not to set “MA” too high
because damage could occur to the motor. The minimum MA time is
0.158 seconds. The actual MA time is the display value times 0.158
seconds (±0.315 seconds). Example: If MA is set to 60, MA Time = (60 x
0.158 seconds) = 9.48 seconds ±0.315 seconds.
Note: In linear trip mode (TC = J00), the RD2 time is appoximately 50% of
the normal RD2 time. Example: If RD2 is set to 10 minutes, the
TC = J00, then the actual RD2 time in the linear trip mode will be 5
minutes.
OCTD- In linear trip mode (TC = J00), the RD2 position becomes the
Overcurrent Trip Delay. To view and adjust OCTD, TC must be
J00. This setting represents the maximum time that the
unit will tolerate an overcurrent condition before tripping.
The minimum OCTD time is 0.158 seconds. The actual OCTD is the
display value times 0.158 seconds (±0.315 seconds). Example: If
OCTD is set to 6, OCTD = (6 x 0.158 seconds) = 0.948 seconds ±0.315
seconds.
-7- 07/25/03

RD3- “RD3” is the restart delay after an undercurrent. It is also known as a dry
well recovery timer and is usually used in submersible pumping
applications. The setting of “RD3” depends on the recovery time of the
water well and varies widely from application to application.
Note: In linear trip mode (TC = J00), the RD3 time is appoximately 50% of
the normal RD3 time. Example: If RD3 is set to 30 minutes, the
TC = J00, then the actual RD3 time in the linear trip mode will be 15
minutes.
#RU- “#RU” is the number of successive restart attempts allowed after an under
current fault before the overload relay requires manual reset. A setting of
“0” is manual reset and a setting of “A” is continuously automatic reset.
ADDR-“ADDR” is the address setting for RS-485 communications. Available
settings are from A01 - A99. This setting is programmed on the right half
of the PROGRAM/DISPLAY adjustment (see programming instruction
note for explanation of dual function settings). You may ignore this
setting if RS-485 communications are not used.
#RF- “#RF” is the number of successive restart attempts allowed after a current
unbalance, single phasing or overload fault. The following settings are
available: “0”, “1”, “oc1”, “2”, “oc2”, “3”, “oc3”, “4”, “oc4”, “A”, and “ocA”.
A setting which includes “oc” will allow the overload relay to automatically
reset after an overload fault (eg., a setting of “oc2” will allow the overload
relay to reset 2 times after an overload condition, current unbalance, or
single phasing before locking out if an overload condition, current
unbalance, or single phasing is detected within one minute after
restarting). A setting which does not include “oc” requires a manual reset
for all overload faults. A setting of “0” is manual reset and a setting of “A”
is continuously automatic restart.
UCTD-“UCTD” is the undercurrent trip delay timer. This setting represents the
maximum time that the unit will tolerate an under current condition.
Typically, UCTD is set to 2 - 4 seconds.
GF- “GF” is the ground fault protection amperage threshold. This setting
detects a leakage current to ground and signals an insulation breakdown
in the system. The “GF” setting should be some where between 10% and
20% of the full load motor current. Short circuit protection is provided by
separate branch protective devices such as circuit breakers or fuses.
Ground fault protection is a Class II ground fault protector and should not
be used for personnel safety, but can be used to indicate motor
degradation for maintenance purposes.
07/25/03 -8-

Trip Class Application Description
5Small fractional horsepower motors where acceleration times are almost
instantaneous or where extremely quick trip times are required.
10 (Fast Trip) Hermetic refrigerant motors, compressors, submersible pumps, and
general purpose motors that reach rated speed in less than 4 seconds.
15 Certain specialized applications.
20 (Standard Trip) Most NEMA-rated general purpose motors will be protected by this
setting.
30 (Slow Trip) Motors with long acceleration times (>10 seconds) or high inertia loads.
J Prex
Programming any of the above trip classes with the J prex will enable jam
protection. This additional protection is enabled 1 minute after the motor starts and
provides a 2-second trip time for motors exceeding 400% SFA, regardless of trip
class.
J00
(Fast Linear Trip Mode) This setting provides an adjustable linear trip that can be
used for very quick or very slow trips. This is used for sensitive motors, quick trips in
test panels, and fast trips to protect high torque systems.
TABLE NO. 2: TRIP CLASS DESCRIPTIONS
FIGURE NO. 4: OVERLOAD TRIP CLASSES AND TRIP TIMES
10000
1000
100
10
0 300 400 500
% of OC Setting
Trip Time (Seconds)
600 700 800 900 1000
Class 10
Class 30
Class 20
Class 15
Class 5
200100
1
PROGRAMMING EXAMPLES
#1 - Motor to be protected: 3∅, 230 volt, 5 hp submersible pump with a full load
amperage of 15.9and a maximum service factor amperage of 18.2. Use the
following calculations and reasoning to determine the appropriate settings for
this application.
-9- 07/25/03

LV- 575 x 0.90 = 517
HV- 575 x 1.10 = 632
VUB- Manufacturer suggest 5%
MULT-From Table No. 1, MULT = 2 (2 conductors, 1 loop)
OC- Service Factor Amperage = 18.2
UC- FLA x 0.80 = 15.9 x 0.80 = 12.7
CUB- Manufacturer suggest 5%
TC- TC = 010 (To program RD1 and RD2), then TC = J00
RD1- To protect the pump from rapid cycling and reduce the number of
starts per hour, RD1 = 10 (Display value) x 0.5 = 5 seconds.
RD2- Since the motor is small and submerged in water it will
generally cool off quickly, RD2 = 10 x 0.5 = 5 Minutes.
MA- MA = 64 (Displayed value) x 0.158 = 10.1 Seconds.
OCTD-OCTD = 10 (Displayed value) x 0.158 = 1.58 Seconds.
RD3- The well history shows that it will fully recover in 2 hours.
RD3 = 240 x 0.5 = 120 Minutes
#RU- In this application, we know that the well will eventually recharge
itself, #RU = A.
#RF- This well is known for sand to jam the impeller, therefore “oc”
should be included so that the pump will attempt to automatically
restart after an overloaded condition. History shows that 1 start
attempt usually clears the sand out of the impeller. #RF = oc1
UCTD- UCTD = 10
GF- Because it may take several days to get a new pump motor and
schedule for maintenance personnel to remove and replace the
pump motor, GF setting of 10% of full load amperage will give the
well owner enough time to prepare for pump replacement.
GF = 56.2A x 0.10 = 5.6
#2- Motor To Be Protected: 3Ø, 460 Volt, 25 Hp air compressor with a full load
amperage rating of 34A and maximum service factor amps of 37.4. Use the
following calculations and reasoning to determine the appropriate settings
for this application.
LV- 575 x 0.90 = 517
HV- 575 x 1.10 = 632
VUB- Standard NEMA motor = 5
MULT-From Table No. 1 = 1
OC- Service Factor Amperage = 37.4
UC- FLA x 0.80 = 34A x 0.80 = 27.2
CUB- Standard NEMA motor = 5
TC- General purpose motor = 20
RD1- Since this compressor takes about 10 seconds to bleed off excess
pressure after a shutdown, setting RD1 = 20 will allow the
compressor to unload before being restarted.
RD2- Because the motor may be hot from running in an unbalance or
single phase condition, a motor cool down time of 10 minutes,
RD2 = 10, should be appropriate.
07/25/03 -10-

DISPLAYED MESSAGE MEANING
oc Tripped on Overcurrent
SP Tripped on Single-Phasing
ub Tripped on Unbalance
uc Tripped on Undercurrent
CF Tripped on Contactor Failure
(Current Unbalance without Voltage Unbalance)
GrF Tripped on Ground Fault
HI Preventing the motor from starting due to High Voltage
Lo Preventing the motor from starting due to Low Voltage
rP Preventing the motor from starting due to Reverse Phasing
oFF A stop command was issued from a remote source
TABLE NO.3: DISPLAY MESSAGES
MULTI-FUNCTION SYSTEM DISPLAY
The output display can show various system operating parameters:
•L1-L2 Voltage •L2-L3 Voltage •L3-L1 Voltage •Average Voltage
•Average Current •A∅ Current •B∅ Current •C∅ Current
When the “MODE SELECT” switch is in the “RUN” position, the LED will display
one of the above operating parameters. To select or change the displayed pa-
rameter, turn the “DISPLAY / PROGRAM” adjustment to the desired position as
shown on the label.
The multi-function display also announces system faults such as low voltage,
high voltage, single phasing, unbalance, and reverse phasing errors. Any time
the “MODE SELECT” switch is in the “RUN” position, the “RESET / PROGRAM”
button may be pushed to view the last fault which occured. Table No. 3 shows
the possible messages.
RD3/#RU- Because an undercurrent would signal a serious problem in this
application (a broken shaft or belt), #RU should be set = 0 for a
manual reset. Therefore, RD3 does not have any function
#RF- Because an overload (overcurrent) fault signals a serious problem in
this application (e.g., worn bearings), “oc” should not be included in
the #RF setting so that a manual reset after an overload fault is
required. A #RF=1 will give the system 1 chance to recover from an
unbalance or single phasing problem before manual reset is required.
UCTD-Setting UCTD = 5 will allow normal operation and not allow the motor
to run too long in a failure mode.
GF- A ground fault setting of 15% of full load amps will be a significant
indicator that the motor hould be evaluated for repair or replacement.
Therefore, GF = 34A x 0.15 = 5.1.
-11- 07/25/03

PROBLEM SOLUTION
The unit will not start.
Display alternates “rP” with the
“DISPLAY / PROGRAM’ switch
value.
The voltage inputs are reverse phased. If this is the initial start
up, swap the “L1” and “L3” leads to correct the problem. If the
overload relay has been previously running, the power system
has been reverse phased. Check the phase sequence of the
incoming power lines.
The unit will not start.
Display alternates “SP”, “uB”,
“HI”, or “Lo with “DISPLAY /
PROGRAM” switch parameter
value.
The incoming voltage is not within the limits programmed in the
“VUB”, “HV”, and “LV” settings. Adjust the “DISPLAY /
PROGRAM” switch to read the incoming line voltage values.
Correct the incoming power problem and check programmed
limits to verify they are correct.
Display alternates “SP”, “uB”,
or “oc” with “RUN”.
The overload relay has tripped on the fault shown on the display
and is timimg down “RD2” before restarting.
Display alternates “uc” with
“RUN”.
The overload relay has tripped on undercurrent and is timing
down “RD3” before restarting. If undercurrent is not a normal
condition for this installation, check for broken shafts, broken
belts, etc.
Display is showing a solid “SP”,
“uB”, or “oc”.
The unit has tripped on the fault shown and manual reset is
required because of the programmed setting in”#RF”. Check
the system for problems that would produce the single phase,
overload, or current unbalance fault like a jam.
Display is showing a solid “uc”.
The unit has tripped on undercurrent and a manual reset is
required because of the setting in “#RU”. Check the system for
problems that would produce a loss of load like a broken belt or
a pump is out of liquid.
Display is showing a solid “CF”.
The unit has tripped on a single phasing of the current, but was
not single phased by the incoming power. Check for damaged
contacts or loose wiring.
TROUBLESHOOTING
Any questions or comments call SymCom at 1-800-843-8848 or
1-605-348-5580
07/25/03 -12-

COMMUNICATIONS PORT / REMOTE RESET
The Model 777-FT comes standard with a 9-pin sub-D connector for remote
communications. The Model 777-FT supports the RS-485 communication
standard using the MODBUS protocol. This standard allows up to 99 Model
777-FTs to be controlled and monitored from a single remote personal computer.
Control and monitoring is also possible from SymCom’s RM-1000 and RM-2000.
PLC and SCADA systems using the RS-485 standard and MODBUS protocol
can also be used.
NOTE: An RS-485MS-2W module is required to operate the communications
bus. (Refer to RS-485MS-2W Installation Instructions for more
information on this subject). The communications port also
provides connections for remote reset as shown in Figure No. 6.
5 4 3 2
9 8 7 6
1
Normally Open Push Button
FIGURE NO. 6: REMOTE RESET CONNECTIONS
-13- 07/25/03

SymCom warrants its microcontroller based products against defects in material or workmanship
for a period of ve (5) years* from the date of manufacture. All other products manufactured by
SymCom shall be warranted against defects in material and workmanship for a period of two (2)
years from the date of manufacture. For complete information on warranty, liability, terms, and
conditions, please refer to the SymCom Terms and Conditions of Sale document.
* The 520 Series has a one (1) year warranty and the LSRU series has a two (2) year warranty.
CLEARING LAST FAULT
The last fault stored can be cleared on the unit. This procedure is outlined as
follows:
1. Rotate the Mode Select Switch to GF .
2. Press and hold the Reset/Program Button. Adjust the Display/Program
adjustment until cLr appears on the display. Release the Reset/
Program Button.
To verify the last fault was cleared, place the Mode Select switch in the Run
position. Then press and hold the Reset/Program Button, cLr should be on the
display.
TAMPER GUARD
The unit can be protected from unauthorized program changes by locking in the
setpoints.
This procedure is outlined as follows:
1. Rotate the Mode Select switch to GF .
2. Rotate Display/Program adjustment fully clockwise.
3. Press and hold the Reset Button. Adjust the Display/Program
adjustment until Loc appears in the display.
4. Release the Reset Button.
5. Turn Mode Select switch to run .
The program is now locked, but all settings can be viewed. The unit can be
unlocked by following the procedure above except step three. This step should
say: Press and hold the Reset Button. Adjust the Display/Program adjustment
until unL appears in the display.
07/25/03 -14-

ELECTRICAL
Input Voltage 475 - 600 VAC, 3∅
Nominal
Frequency 50 / 60 Hz
Motor Full Load Amp Range
2-25 amps 3∅ (loops required)
25-90 amps 3∅ (direct)
80-800 amps 3∅ (External CTs)
Power Consumption 10 W (Maximum)
Output Contact Rating SPDT (Form C) Pilot Duty Rating: 480 VA @ 240 VAC
General Purpose: 10 A @ 240 VAC
Expected Life
Mechanical 1 x 106 Operations
Electrical 1 x 105 Operations at rated load
Accuracy at 25o C (77oF)
Voltage ±1%
Current ±3% plus CT accuracy
GF Current ±15%
Timing 5% ±1 second
Repeatability
Voltage ±0.5% of nominal voltage
Current ±1% of nominal current
TRIP TIMES (Those not shown have user selectable trip times)
Ground Fault Trip Time
101-200% of Setpoint 8 Seconds ±1 Second
201-300% of Setpoint 4 Seconds ±1 Second
301-400% of Setpoint 3 Seconds ±1 Second
401% or Greater of Setpoint 2 Seconds ±1 Second
Current Unbalance Trip Time
1% Over Setpoint 30 Seconds
2% Over Setpoint 15 Seconds
3% Over Setpoint 10 Seconds
4% Over Setpoint 7.5 Seconds
5% Over Setpoint 6 Seconds
6% Over Setpoint 5 Seconds
10% Over Setpoint 3 Seconds
15% Over Setpoint 2 Seconds
SAFETY MARKS
UL UL508, UL1053
-15- 07/25/03
SPECIFICATIONS

Standards Passed
Electrostatic Discharge (ESD) IEC 1000-4-2, Level 3, 6 KV Contact, 8 KV Air
Radio Frequency Immunity (RFI),
Conducted IEC 1000-4-6, Level 3 10 V/M
Radio Frequency Immunity (RFI), Radiated IEC 1000-4-3, Level 3 10 V/M
Fast Transient Burst IEC 1000-4-4, Level 3, 3.5 KV Input Power
Surge
IEC
1000-4-5
Level 3, 2 KV Line-to-Line
Level 4, 4 KV Line-to-Ground
ANSI / IEEE C62.41 Surge and Ring Wave Compliance to a
Level of 6 KV Line-to-Line
Hi-Potential Test Meets UL508 (2 x Rated Voltage + 1000 Volts for
1 Minute
Vibration IEC 68-2-6, 10-55 Hz, 1 mm Peak-to-Peak, 2
Hours, 3 Axis
Shock IEC 68-2-27, 30 G, 3 Axis, 11 mS Duration, Half
Sine Pulse
MECHANICAL
Dimensions 3.0” H x 5.1” D x 3.6” W
Terminal Torque 7 inch/pounds
Enclosure Material Polycarbonate
Weight 1.2 pounds
Maximum Conductor Size Through Unit 0.65” with insulation
ENVIRONMENTAL
Temperature Range Ambient Operating: -20o - 70o C (-4o - 158o F)
Ambient Storage: -40o - 80o C (-40o - 176o F)
Pollution Degree 3
Class of Protection IP20, NEMA 1
07/25/03 -16-

PROGRAMMABLE OPERATING POINTS
LV- Low Voltage Threshold 450V - HV Setting
HV - High Voltage Threshold LV Setting - 660V
VUB - Voltage Unbalance Threshold 2 - 15% or 999 (OFF)
MULT - # conductors or CT Ratio (xxx:5) 1-10 conductors or 100-800 Ratio
OC - Overcurrent Threshold (20 to 100 A) ÷ MULT or 80 to 120% of CT Ratio
UC - Undercurrent Threshold (0, 10 to 98 A) ÷ MULT or 40 to 100% of CT Primary
CUB - Current Unbalance Threshold 2 - 25% or 999 (OFF)
TC - Overcurrent Trip Class** 5, J5, 10, J10, 15, J15, 20, J20, 30, J30, or J00
RD1 - Rapid Cycle Timer 0, 2 - 500 Seconds (x 0.5 if TC = J00)
MA - Motor Acceleration Timer 0 - 250 x (0.158 through 0.315) Seconds
RD2 - Motor Cool Down Timer 2 - 500 Minutes (x 0.5 if TC = J00)
OCTD - Overcurrent Trip Delay (Linear) 2-250 x (0.158 - 0.315) Seconds
RD3 - Dry Well Recovery Timer 2 - 500 Minutes (x 0.5 if TC = J00)
#RU - Number of Restarts After UC Fault 0, 1, 2, 3, 4, or A (Automatic)
ADDR - RS-485 Address A01 - A99
#RF - Number of Restarts After All Faults
Except UC*** 0, 1, oc1, 2, oc2, 3, oc3, 4, oc4, A, or ocA
UCTD - Undercurrent Trip Delay 2 - 60 Seconds
GF - Ground Fault Current Threshold
(3-20 A) ÷ MULT or 10 - 30% of CT Primary or
OFF
-17- 07/25/03
** If J Prex is displayed in trip class setting, jam protection is enabled.
*** If “oc” is displayed in the #RF setting, then Over Current will be included as a
normal
fault and the relay will automatically restart after RD2 expires, otherwise, manual
reset is required after an Over Current fault.

DISPLAY MESSAGE
RESET/
PROGRAM 800-843-8848SYMCOM, INC. RAPID CITY, SD
 
 
 
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  
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DIMENSIONS
07/25/03 -18-

Clear Last Fault 14
Communications Port 13
Connections 1
Dimensions 18
Fast Linear Trip Mode 5
Multi-Function System Display 11
Operation 2
Programmable Operationg Points 17
Programming Examples 9
Programmable Parameters 5
Programming 4
Remote Reset 13
Specications 15
Tamper Guard 14
Troubleshooting 12
Warranty 14
INDEX

2880 North Plaza Drive, Rapid City, SD 57702
Phone: [phone] or [phone]
FAX: [phone]
Visit our website at www.symcom.com
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