Grundfos MP 204 User manual

GRUNDFOS INSTRUCTIONS
Control MP 204 cabinet range
Installation and operating instructions

English (US)
2
English (US) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
Page
1. Limited warranty
Products manufactured by GRUNDFOS PUMPS CORPORATION
(Grundfos) are warranted to the original user only to be free of
defects in material and workmanship for a period of 24 months
from date of installation, but not more than 30 months from date
of manufacture. Grundfos' liability under this warranty shall be
limited to repairing or replacing at Grundfos' option, without
charge, F.O.B. Grundfos' factory or authorized service station,
any product of Grundfos' manufacture. Grundfos will not be liable
for any costs of removal, installation, transportation, or any other
charges which may arise in connection with a warranty claim.
Products which are sold but not manufactured by Grundfos are
subject to the warranty provided by the manufacturer of said
products and not by Grundfos' warranty. Grundfos will not be
liable for damage or wear to products caused by abnormal
operating conditions, accident, abuse, misuse, unauthorized
alteration or repair, or if the product was not installed in
accordance with Grundfos' printed installation and operating
instructions.
To obtain service under this warranty, the defective product must
be returned to the distributor or dealer of Grundfos' products from
which it was purchased together with proof of purchase and
installation date, failure date, and supporting installation data.
Unless otherwise provided, the distributor or dealer will contact
Grundfos or an authorized service station for instructions.
Any defective product to be returned to Grundfos or a service
station must be sent freight prepaid; documentation supporting
the warranty claim and/or a Return Material Authorization must
be included if so instructed.
GRUNDFOS WILL NOT BE LIABLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES, LOSSES, OR EXPENSES
ARISING FROM INSTALLATION, USE, OR ANY OTHER
CAUSES. THERE ARE NO EXPRESS OR IMPLIED
WARRANTIES, INCLUDING MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE, WHICH EXTEND BEYOND
THOSE WARRANTIES DESCRIBED OR REFERRED TO
ABOVE.
Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages and some jurisdictions do
not allow limit actions on how long implied warranties may last.
Therefore, the above limitations or exclusions may not apply to
you. This warranty gives you specific legal rights and you may
also have other rights which vary from jurisdiction to jurisdiction.
2. Symbols used in this document
1. Limited warranty 2
2. Symbols used in this document 2
3. Scope of these instructions 3
4. Product introduction 3
5. Applications 3
6. Identification 4
6.1 Nameplate 4
6.2 Type key 4
7. Product overview 5
7.1 Product range 5
7.2 Options 5
8. Operating conditions 5
8.1 Ambient temperature and altitude 5
9. Installation 5
9.1 Mechanical installation 5
10. Electrical installation 6
10.1 Electrical connection 6
10.2 Input for Pt100/Pt1000 7
10.3 Input for PTC/thermal switch 7
10.4 Back-up fuses 7
10.5 Wiring diagrams 8
10.6 External current transformers 11
11. Function 12
11.1 Factory settings 12
12. Operation 13
12.1 Startup 13
12.2 Setting on control panel 14
12.3 Learning function 15
12.4 Submersible pumps 16
12.5 Wastewater pumps 16
13. Curves 17
13.1 Trip class "P" 17
13.2 IEC trip curves 18
14. Fault finding 19
14.1 Warning and trip codes 19
15. Technical data 20
15.1 Electrical data 20
15.2 Approvals and standards 20
15.3 Outputs 20
15.4 Inputs 20
15.5 Insulation measurement method 20
15.6 Measuring ranges 21
15.7 Setting ranges 21
16. Disposal 21
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
Warning
If these safety instructions are not observed,
it may result in personal injury.
Caution
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Note
Note
Notes or instructions that make the job easier
and ensure safe operation.

3
English (US)
3. Scope of these instructions
These installation and operating instructions apply to applications
where the motor protection cabinet with Grundfos MP 204 is
used.
The subcomponents in the control cabinet are only described in
these instructions when they are important for the operation of
the MP 204 motor protection unit.
Further documentation supplied with the Control MP 204 cabinet
range
– Safety instructions for MP 204
– installation and operating manual for MP 204
– additional instructions (CIU 252, CIU 902, CIU 272)
– functional profile for MP 204
– circuit diagram for the Control MP 204
– Grundfos GO manual.
4. Product introduction
The MP 204 motor protection unit is designed to protect electrical
motors in the most efficient way. The cabinet range
Control MP 204 is designed to provide motor protection for a
single pump installation.
The MP 204 cabinet range is suitable for any type of pump that
works with across the line start, star delta start. The motor
protection MP 204 will not work together with a variable
frequency drive of any kind.
The MP 204 pump motor protection unit is designed to protect
especially Grundfos submersible pumps and waste water pumps
but in general the motor protection unit MP 204 will be able to
work with any motor where protection is required, except variable
frequency drives.
Industrial pumps
Industrial pumps may incorporate a PTC/thermal switch to be
connected direct to the MP 204.
Industrial pumps mainly apply IEC trip classes 20 to 30,
depending on the liquid viscosity.
5. Applications
The MP 204 can be used as a stand-alone motor protector.
The MP 204 panel range is a perfect match for groundwater,
irrigation applications where submersible pumps are used and
where motor characteristics are essential to monitor. The MP 204
unit may also be connected to external monitoring devices
provided by Grundfos. Monitoring of the MP 204 is possible via a
Grundfos GENIbus.
The power supply to the MP 204 is in parallel with the supply to
the motor. Motor currents up to 120 A are passed directly through
the MP 204. The MP 204 protects the motor primarily by
measuring the motor current by means of a true RMS
measurement. The MP 204 disconnects the contactor, if for
example, the curent exceeds the preset value.
The pump is protected secondarily by measuring the temperature
with a Tempcon sensor, a Pt100/Pt10000 sensor and a PTC
sensor/thermal switch.
The MP 204 is designed for single- and three-phase motors.
In single-phase motors, the starting and run capacitors are also
measured. Cos (φ) is measured in both single- and three-phase
systems.
Note
Note
The Control MP 204 cabinet range shall not be
used in connection with a variable frequency
drive.

English (US)
4
6. Identification
6.1 Nameplate
Fig. 1 Control MP 204 electrical cabinet nameplate
6.2 Type key
TM04 9121 3510
1
3
9
10
11
14
2
4
5
6
8
7
12
13
15
Type:
151 DOL
Model: Pc:
Serial no.:
Main supply:
In:
Ambient temperature:
Main
IP:
Weight:
Made in
pump:
Imin
Number: [A] [A] method
Imax Starting
XXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXX XXXXXX
XXX
XXXXXXXXXXXXXXXXXXX
XX
XXXXXXX
XX
XXXX
Pos. Description
1 Type designation
2 Model
3 Serial number
4 Mains supply
5Power consumption for the complete electrical
cabinet
6 Fuse size
7 Ambient temperature for the electrical cabinet
8 Maximum allowed connection voltage
9 Maximum allowed connection current
10 Maximum relay output current and voltage
11 Order number
12 List of options such as: Alarm beacon, CIU
communication unit
13 Type UL enclosure rating (Standard is UL Type 3R
enclosure rating)
14 Weight in pounds
15 Approval
Example Control MP 204 1x 1-1.6 ACL IEC 3 x 460 Type 3R OPT
Type range
Number of pumps
Current range of pumps [A]
Starting method
ACL: Across the line IEC starters
SST: Soft starter
Supply voltage
Panel type
Type 3R: Outdoor cabinet
OPT
Options (if any; see nameplate for details)

5
English (US)
7. Product overview
7.1 Product range
7.1.1 Electrical cabinet range
7.2 Options
Options to be selected for the electrical cabinet range:
8. Operating conditions
8.1 Ambient temperature and altitude
Max altitude
6.561 ft (2000 m).
Ambient temperature
– During operation: -4 °F to +140 °F (-20 °C to +60 °C)
(panel should not be exposed to direct sunlight).
– In stock: -13 °F to +185 °F (-25 °C to +85 °C).
– During transportation: -13 °F to +185 °F (-25 °C to +85 °C).
Relative air humidity
5 to 95 %.
UL Type enclosure rating
UL Type 3R.
9. Installation
Before installation the following shall be confirmed:
– Do the specifications of the Control MP 204 cabinet
correspond to the order specification?
– Are all visible parts intact?
9.1 Mechanical installation
This section describes the mechanical installation of the Control
MP 204 electrical cabinet and also provides general
recommendations on how to position sensors in order to achieve
stable measured values.
The MP 204 unit is the central unit in the electrical cabinet and
this is the unit that provides the motor protection for the given
motor.
The electrical cabinet is mounted either on a pole with a mounting
bracket or is wall mounted with screws. Refer to cabinet
dimensional drawing for wall mounting holes.
Direct online / ACL, NEMA 3R
Control MP 204
1x3-5A ACL IEC 3x 230 3R
1x5-8A ACL IEC 3x 230 3R
1x8-13A ACL IEC 3x 230 3R
1x13-21A ACL IEC 3x 230 3R
1x21-28A ACL IEC 3x 230 3R
1x28-34A ACL IEC 3x 230 3R
1x34-43A ACL IEC 3x 230 3R
1x43-53A ACL IEC 3x 230 3R
1x53-68A ACL IEC 3x 230 3R
1x68-85A ACL IEC 3x 230 3R
1x85-103A ACL IEC 3x 230 3R
Soft starter, NEMA 3R
Control MP 204
1x8-13A SST IEC 3 x 460
1x13-21A SST IEC 3 x 460
1x21-28A SST IEC 3 x 460
1x28-34A SST IEC 3 x 460
1x34-43A SST IEC 3 x 460
1x43-53A SST IEC 3 x 460
1x53-68A SST IEC 3 x 460
1x68-85A SST IEC 3 x 460
CIU 200 MODBUS RTU
CIU 500 with modem, Kit
Lightning protection
Surge protection
MP 204 Disconnect 200-240 VAC
MP 204 Disconnect 440-408 VAC

English (US)
6
10. Electrical installation
10.1 Electrical connection
10.1.1 Overview
Fig. 2 Cable entries Fig. 3 Terminals
1) 10 mm2with cable terminal
2) 4 mm2with cable terminal
TM03 0181 4404
Pos. 1
TM03 0181 4505
MP 204
Pos. 2 Pos. 3
Pos. 6Pos. 4 Pos. 5
Pos. 7
Pos. Designation Three-phase connection Single-phase connection Cable
1I1 Entry for phase L1 to motor Entry for neutral Max. ∅16 mmI2 Entry for phase L2 to motor Entry for phase
I3 Entry for phase L3 to motor Entry for auxiliary winding
2
L1/N Supply: L1 Supply: Neutral
Max. 61) mm2
L2/L Supply: L2 Supply: Phase
L3/A Supply: L3 Auxiliary winding
FE Functional ground (earth)
5 Insulation measurement
3T1 PTC/thermal switch
Max. 2.52) mm2
T2
4A GENIbus data A Y Reference/screen
B GENIbus data B
5
+Pt100/Pt1000 sensorC
C
SH Screen
695 Trip relay NC
96
797 Signal relay NO
98
UL requirement:
For field wiring terminals, min. 140/167 °F (60/75 °C) stranded copper conductors must be used.

7
English (US)
10.2 Input for Pt100/Pt1000
See fig. 3, pos. 5.
For examples of Pt100/Pt1000 connection, see fig. 4and fig. 5.
Fig. 4 Two-core Pt100/Pt1000 connection
10.3 Input for PTC/thermal switch
See fig. 3, pos. 3.
If not used, short-circuit the PTC input using a wire, or deactivate
it with the R100 or Grundfos GO.
10.4 Back-up fuses
Maximum back-up fuse sizes which may be used for the MP 204
appear from the table below:
At motor currents up to and including 120 A, the cables to the
motor can be taken direct through the I1-I2-I3 of the MP 204.
At motor currents above 120 A, current transformers must be
used. See fig. 2, pos. 1.
If current transformers are used, the L1-L2-L3 and "5" to the MP
204 must be protected with max. 10 A fuses.
For installation examples, see fig. 5through fig. 9.
Terminal
designation Description
+ Resistance input.
C
Correction for lead resistance.
To be connected by means of a three-core
Pt100/Pt1000 connection, otherwise the two
"C" terminals are to be short-circuited.
C
Correction for lead resistance.
To be connected by means of a three-core
Pt100/Pt1000 connection, otherwise the two
"C" terminals are to be short-circuited.
SH 0 V (screen).
TM03 1397 2205
Terminal
designation Description
T1 Connection of PTC/thermal switch
T2
Pt100
E1
L1 L2 L3
+
C C
I1 I2 I3
T1 T2
FE
5
A Y B
MP 204
Pt100/Pt1000
MP 204 Max. size
[A] Type
Without external current
transformer 120 RK5
With 200/5 external current
transformer 200 RK5
With 300/5 external current
transformer 300 RK5
With 500/5 external current
transformer 500 RK5
With 750/5 external current
transformer 750 RK5
With 1000/5 external current
transformer 1000 RK5
Note
Note
If back-up fuses above 50 A are used, the
L1-L2-L3 and "5" to the MP 204 must be protected
separately with max. 10 A fuses. See fig. 5.

English (US)
8
10.5 Wiring diagrams
10.5.1 Three-phase system
The wiring diagram, fig. 5, shows an example of a three-phase
pump with insulation measurement.
The connections to L1, L2, L3 and "5" can be made with a cable
of up to 10 mm2. A special fuse unit up to approx. 50 A is
therefore not required.
If larger back-up fuses are used, the voltage to the L1, L2 and L3
must be protected separately. A maximum of 10 A or less is
recommended.
Fig. 5 Three-phase connection
TM03 0122 2205
1
2
35
46
13
14
S1
K1
S0
22
21
13
14
K1
96
95
E1
K1
A1
A2
L
1
L
2
L
3
3~
Pt100
E1
L1 L2 L3
+
C C
I1 I2 I3
T1 T2
FE
5
A Y B
Max. 10 A
MP 204
Pt100/Pt1000

9
English (US)
10.5.2 Three-phase system with external current transformers
Fig. 6 Three-phase connection with current transformers
Fig. 7 Five windings per phase through the MP 204
TM03 0123 2205
1
2
35
46
K1
13
14
S1
K1
S0
22
21
13
14
R1
96
95
E1
A1
A2
+
C C
T1 T2
FE
Pt100
E1
L1 L2 L3
I1 I2 I3
5
A Y B
L
1
L
2
L
3
3~
Max. 10 A
MP 204
Pt100/Pt1000
TM03 1398 1905

English (US)
10
10.5.3 Single-phase system with starting and run capacitors
Fig. 8 Single-phase connection
TM03 0124 2205
1
2
3
4
13
14
S1
K1
S0
22
21
13
14
K1
96
95
E1
K1
E1
L1 L2 L3
+
C C
I1 I2 I3
T1 T2
FE
5
A
Y
B
A1
A2
MA
Pt100
CC
L
1
N
1~
run start
MP 204
Pt100/Pt1000

11
English (US)
10.6 External current transformers
At motor currents above 120 A, external current transformers
must be used. Fit the transformers as shown in fig. 9.
Fig. 9 Current transformers
Fig. 10 Five windings per phase through the MP 204
Note
Note
Take the three measuring cables through the
three holes in the MP 204 five times per phase.
See fig. 10.
Note
Note
The three current transformers must be fitted in
the same direction, and the measuring cables
must be connected in the same way.
TM03 0172 4304
x5 x5
x5
L
1
L
2
L
3
TM03 1398 1905
Product
number Current transformer ratio Imax. Pmax.
96095274 200:5 200 A 5 VA
96095275 300:5 300 A 5 VA
96095276 500:5 500 A 5 VA
96095277 750:5 750 A 5 VA
96095278 1000:5 1000 A 5 VA

English (US)
12
11. Function
• Phase-sequence monitoring
• Indication of current or temperature
• (user selection)
• Input for PTC/thermal switch
• Indication of temperature in °F or °C (user selection)
• 4-digit, 7-segment display
• Setting and status reading with the R100 or Grundfos GO
• Setting and status reading via the GENIbus.
Tripping conditions
•Overload
• Underload (dry running)
• Temperature (Tempcon sensor, PTC/thermal switch and Pt
sensor)
• Missing phase
• Phase sequence
•Overvoltage
• Undervoltage
• Power factor (cos (φ))
• Current unbalance.
Warnings
•Overload
• Underload
• Temperature (Tempcon, see section 12.2 Setting on control
panel, and Pt sensor)
•Overvoltage
• Undervoltage
• Power factor (cos (φ))
• Run capacitor (single-phase operation)
• Starting capacitor (single-phase operation)
• Loss of communication in network
• Harmonic distortion.
Learning function
• Phase sequence (three-phase operation)
• Run capacitor (single-phase operation)
• Starting capacitor (single-phase operation)
• Identification and measurement of Pt100/Pt1000 sensor
circuit.
11.1 Factory settings
Current limit: 0 A
Nominal voltage: 400 V
Class: P (trip delay: 5 seconds)
Trip delay: 5 seconds
Number of phases: 3, non-grounded (non-earthed)
Power-on delay: 5 seconds.
Learning function: Active.
Active trip limits
Overload according to class
Underload: - 40 %
Overvoltage: + 20 %
Undervoltage: - 20 %
Phase-sequence monitoring
Current unbalance: 10 %
PTC/thermal switch.
Active warnings
Run capacitor, low: - 50 %
Starting capacitor, low: - 50 %.
Note
Note
In connection with single- and three-phase
connection.
Note
Note
The overvoltage and undervoltage trip limits will
be deactivated automatically if the temperature
monitoring with Tempcon or Pt100/Pt1000 has
been set to active.

13
English (US)
12. Operation
12.1 Startup
A basic setting of the MP 204 can be made on the control panel.
Additional functions must be set with the R100 remote control,
Grundfos GO or PC Tool Water Utility.
12.1.1 General information
Fig. 11 Control panel
12.1.2 Button (Test)
Press [ ] button to open trip relay connection 95-96 and close
signal relay connection 97-98. The red "Trip" indicator light is on.
The function is identical to the overload trip.
12.1.3 Button (Reset)
Press [ ] button to change the tripped state to normal state with
trip relay connection 95-96 closed and signal relay connection
97-98 open. The red "Trip" indicator light is off. This implies that
the tripped state has actually ceased. The [ ] button also resets
warnings, if any.
12.1.4 Button (+)
Normally the actual current or temperature appears in the display.
Press [ ] button to show information in the display, according to
the following sequence:
Fig. 12 Sequence in display
• The trip code only appears if the MP 204 is tripped.
Switches between "trip" and trip code.
• The warning code only appears if the limit value of one or
more warnings has been exceeded, and if warning code
indication has been activated.
• Temperatures only appear if the matching sensors have been
connected and activated. If no Tempcon signal is received,
"----" appears in the MP 204 display.
•Cos(φ) only appears if this indication has been activated with
the R100 or Grundfos GO.
When the motor is operating, the display shows the actual value.
When the motor stops, the display shows the last measured
value.
12.1.5 Button (-)
Only used in connection with the basic setting of the MP 204.
TM03 0181 4404
Pos. Description Explanation
1"Power" indicator
light
• Flashes green until the
MP 204 is ready for
operation (power-on delay).
• Is permanently green when
the MP 204 is ready for
operation.
• Flashes red when
communicating with the
R100 or Grundfos GO.
2 "Trip" indicator light Is red when the trip relay is
activated.
3 Display 4 digits, for basic setting and
data reading.
4IRfield R100 or Grundfos GO
communication.
5 Operating buttons
Setting and operation.
MP 204
Pos. 1
Pos. 2
Pos. 3
Pos. 4
Pos. 5
R
R
R
TM06 1752 2714
Trip code (flashing)
Warning code no. 1-n
Current
Voltage
Temperature
Tempcon
Temperature
Pt sensor
Phase angle
cos (φ)

English (US)
14
12.2 Setting on control panel
Press [ ] and [ ] buttons simultaneously for a minimum of
5 seconds to place the MP 204 in the programming mode.
When the display shows "....", the buttons can be released.
The set value, e.g. "4.9 A", appears. The unit symbol "A" is
flashing.
Enter the values of
• rated current
• nominal voltage
• trip class
• number of phases.
If no buttons are activated, the voltage appears after 10 seconds.
After a further 10 seconds, the set voltage is stored automatically,
and the programming mode ends. See fig. 13.
12.2.1 Rated current
Set the rated motor current with [ ] and [ ] buttons. (See motor
nameplate.)
• Press [ ] to store the setting and continue, or
• press [ ] to cancel the change and finish.
The programming mode ends automatically after 10 seconds, and
the change is cancelled. See fig. 13.
12.2.2 Nominal voltage
Set the nominal voltage with [ ] and [ ] buttons.
• Press [ ] to store the setting and continue, or
• press [ ] to store the setting and finish.
The programming mode ends automatically after 10 seconds, and
the change is stored. See fig. 13.
12.2.3 Trip class
Set the trip class with [ ] and [ ] buttons.
For submersible pumps, manual setting of the trip delay, class
"P", is normally selected. The time is factory-set to 10 seconds.
It can be changed with the R100 or Grundfos GO.
For other pumps, the required IEC trip class (1-45) is to be set.
Normally class 10 is selected. For trip curves, see page 18.
• Press [ ] to store the setting and continue, or
• press [ ] to store the setting and finish.
The programming mode ends automatically after 10 seconds, and
the change is stored. See fig. 13.
12.2.4 Number of phases
Set the number of phases with [ ] and [ ] buttons (1 phase,
3 phases (non-grounded (non-earthed)) or 3 phases w.
FE (functional ground (earth)).
• Press [ ] to store the setting and continue, or
• press [ ] to store the setting and finish.
The programming mode ends automatically after 10 seconds, and
the change is stored. See fig. 13.
Note
Note
Insulation measurement is only possible of
grounded (earthed) three-phase systems.
Note
Note
Changes in rated current must be finished by
pressing [ ] to store the change.
R
R
R
R

15
English (US)
Fig. 13 Example of basic setting
12.3 Learning function
The learning function is factory-set to "Enable".
After two minutes of continuous motor operation, "LRN" appears
in the display for approx. 5 seconds, while the values are being
stored in the MP 204. See fig. 11, pos. 3.
If, for instance, a Pt sensor or capacitor has been replaced,
reactivate the learning function by pressing [ ] and [ ] buttons
for a minimum of 10 seconds.
The dot in the right side of the display is flashing. The MP 204 is
waiting for current to pass through the unit for a minimum of
120 seconds. Then the phase sequence is measured and stored.
In single-phase systems, the MP 204 measures the capacity of
the starting and run capacitors and stores the values as
reference.
If a Pt100/Pt1000 sensor is installed, the cable impedances to the
sensor are measured and stored as reference.
TM06 17153 2714
Status display
Press for approx. 5 seconds.
+
Set rated current
10 seconds
The value is not stored
The value is not stored
Set nominal voltage
10 seconds
The value is stored
Set trip class
10 seconds
The value is stored
Set number of phases
10 seconds
The value is stored
The value is stored
The value is stored
The value is stored
R
R
R
R
R

English (US)
16
12.4 Submersible pumps
Submersible pumps normally have a short start-up time.
Trip class "P" can therefore be applied with advantage for these
pumps. It is possible to set very short times down to for example
900 ms, used for certain specific applications.
To prevent the Tempcon signal from one submersible pump from
interfering with the signal from another, cabling must be carefully
made to allow measurements to be made of both pumps at the
same time. The motor cables must be kept apart and not installed
in the same cable tray. To avoid interference, it may be necessary
to fit a filter on the supply cables. See fig. 14.
Fig. 14 Submersible pump installation with Tempcon
12.5 Wastewater pumps
Wastewater pumps may incorporate a PTC/thermal switch to be
connected direct to the MP 204.
Wastewater pumps may also be connected to a Pt100/Pt1000
sensor. The sensor can also be connected direct to the MP 204.
The Pt100/Pt1000 can be activated with the R100, Grundfos GO,
or the PC Tool Water Utility.
A high IEC trip class is to be applied for wastewater pumps,
especially grinder-type pumps. Classes 25 to 35 are the optimum
choice. Apply IEC trip class 45 for the pumping of liquids of
extremely high viscosity or liquids containing many solid particles.
TM03 1356 1805
L
1
L
2
L
3
"
""
"
""
Fuses
MP 204 MP 204
Filter
Tempcon circuit
Cables are installed in separate
conduits and cable trays

17
English (US)
13. Curves
13.1 Trip class "P"
Fig. 15 Curves for trip class "P"
The trip delay indicates the maximum period of time during which
the overload condition is allowed to exist, for example 5 seconds.
Example:
A pump is to cut out after 900 ms because the rated current has
been exceeded.
• Select trip class "P".
• Set the overload limit to 10 A (the rated motor current is stated
on the nameplate).
• Set the trip delay to 900 ms.
Figure 15, curve 1:
The pump has an abnormal start-up time, and the current
exceeds 10 A. The MP 204 trips after 900 ms.
Figure 15, curve 2:
The pump has a normal start-up time, and the current exceeds
10 A only briefly (< 900 ms). The MP 204 does not trip.
TM03 0812 1205
Trip delay
2. Curve without tripping
Rated
motor
current
1. Curve with tripping
Time
Current
Note
Note
The curves are examples and cannot be used for
readings.

English (US)
18
13.2 IEC trip curves
Fig. 16 IEC trip curves
Example:
• Set the MP 204 to IEC trip class 20.
• Set the overload limit to 10 A (the rated motor current is stated
on the nameplate).
At a motor current of 22.5 A (10 x 2.25), the MP 204 trips after
approximately 170 seconds.
TM03 0806 0605
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0
1
5
1010
50
100100
500
10001000
5000
10000
MP 204
Class 5
Class 10
Class 20
Class 30
Class 45
Class "p"
Time [s]
x Irated
Irated
170
2.25 x Irated

19
English (US)
14. Fault finding
14.1 Warning and trip codes
MP 204 display A 32
A = Trip
E = Warning
Fault code
Fault code Trip Warning Cause of trip/warning
2 A - Missing phase
3 A - PTC/thermal switch
4 A - Too many automatic restarts per 24 hours
9 A - Wrong phase sequence
12 - E Service warning
15 A - Communication alarm for main system
18 A - Commanded trip (not in alarm log)
20 A E Low insulation resistance
21 - E Too many starts per hour
26 - E The motor is operating even if the MP 204 is tripped
32 A E Overvoltage
40 A E Undervoltage
48 A E Overload
56 A E Underload
64 A E Overtemperature, Tempcon measurement
71 A E Overtemperature, Pt100/Pt1000 measurement
91 - E Signal fault, Tempcon sensor
111 A E Current unbalance
112 A E Cos (φ), max.
113 A E Cos (φ), min.
120 A - Auxiliary winding fault
123 A E Starting capacitor, low
124 A E Run capacitor, low
175 - E Signal fault, Pt100/Pt1000 sensor

English (US)
20
15. Technical data
Max altitude
6.561 ft (2000 m).
Ambient temperature
– During operation: -4 °F to +140 °F (-20 °C to +60 °C)
(panel should not be exposed to direct sunlight).
– In stock: -13 °F to +185 °F (-25 °C to +85 °C).
– During transportation: -13 °F to +185 °F (-25 °C to +85 °C).
Relative air humidity
5 to 95 %.
UL Type enclosure rating
UL Type 3R.
15.1 Electrical data
Refer to the electrical cabinet wiring diagram.
For MP 204 electrical data refer to the manual for the MP 204
unit.
15.2 Approvals and standards
The MP 204 conforms to:
• UL 508
•IEC947
• IEC/EN 60335-1
• IEC 61000-5-1
• IEC 61000-6-3
• IEC 61000-6-2
• EN 61000-6-3
• EN 61000-4-5
• EN 61000-4-4
• EN 61000-4-6.
15.3 Outputs
Trip relay
Signal relay
15.4 Inputs
Input for PTC/thermal switch
Input for Pt100/Pt1000 sensor
15.5 Insulation measurement method
The insulation resistance is measured applying a rectified
alternating voltage. The test voltage can therefore not be
measured using an ordinary voltmeter.
The open-circuit test voltage is calculated as follows:
Example:
The MP 204 is connected to 3 x 400 V.
Voltage category III
Insulation voltage 400 V (to all other terminals)
Insulation test voltage 4 kVAC
Max. load 400 VAC, 2 A, AC-15/24 VDC,
2 A, DC-13, L/R = 40 ms
Min. load 5 V / 10 mA
Max. load power AC/DC 400 VA / 48 W
Contact type NC (normally closed contact)
Voltage category III
Insulation voltage 400 V (to all other terminals)
Insulation test voltage 4 kVAC
Max. load 400 VAC, 2 A, AC-15/24 VDC,
2 A, DC-13, L/R = 40 ms
Min. load 5 V / 10 mA
Max. load power AC/DC 400 VA / 48 W
Contact type NO (normally open contact)
Voltage category IIl
Insulation voltage 400 V (to all other terminals)
Insulation test voltage 4 kVAC
Output voltage
(open contact) 5 V
Output current
(closed contact) 2 mA
Voltage step from
high to low 2.0 V
Equivalent external load 1.5 kΩ
Voltage step from
low to high 2.5 V
Equivalent external load 2.2 kΩ
Input filter time 41 ± 7 ms
Voltage category II
Insulation voltage 50 V
(to system ground (earth))
Insulation test voltage 700 VDC
Temperature range 32-392 °F (0-200 °C)
Sensor type Screened 2- or 3-core cable
Sensor current (Pt100) 2.5 mA
Sensor current (Pt1000) 0.25 mA
Mains frequency suppression 50-60 Hz
Filter times
Integration time 100 ms
Reading interval 400 ms
Utest ×Umains [W]
Utest ×400 =327 [V]
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2
3
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2
3
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