Grundfos MGE F Operating instructions

MGE model F
Service instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Service instructions
Original service instructions
CONTENTS
Page
1. General information
1.1 Hazard statements
The symbols and hazard statements below may appear in
Grundfos installation and operating instructions, safety
instructions and service instructions.
The hazard statements are structured in the following way:
1.2 Notes
The symbols and notes below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.
1. General information 2
1.1 Hazard statements 2
1.2 Notes 2
1.3 Scope of delivery 3
1.4 Safety details to be aware of when working on the
product 3
2. Identification 4
2.1 Nameplates 4
2.2 Type key 5
2.3 Configuration 6
3. General description 6
3.1 Wiring diagrams and signal terminals 7
3.2 Control panel 8
3.3 Indicator lights 8
4. Fault finding 9
4.1 Safety instructions 9
4.2 Fault finding procedure 9
4.3 Operating conditions 9
4.4 PC Tool E-products as service tool 10
4.5 Fault observations 10
4.6 Fault finding using the indicator lights on the control
panel 11
4.7 Fault finding using alarm and warning codes 15
5. Maintenance 19
5.1 Lubrication of motor bearings 19
5.2 Replacement of motor bearings 20
6. Emergency operation (bypass) 22
6.1 Establishing emergency operation 23
6.2 Re-establishment of frequency converter operation 24
7. Drawings and diagrams 25
8. Tightening torques and lubrication 28
8.1 Tightening torques 28
8.2 Lubricating intervals and grease 28
9. Service tools 29
Read this document before starting service work on
the product. Installation and service work must
comply with local regulations and accepted codes of
good practice.
Observe the safety instructions in the installation and
operating instructions for the product.
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning.
- Action to avoid the hazard.
Observe these instructions for explosion-proof
products.
A blue or grey circle with a white graphical symbol
indicates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with
a black graphical symbol, indicates that an action
must not be taken or must be stopped.
If these instructions are not observed, it may result in
malfunction or damage to the equipment.
Tips and advice that make the work easier.

English (GB)
3
1.3 Scope of delivery
These service instructions describe fault finding of pumps with
Grundfos motors, type MGE model F (hereafter called MGE-F).
If the fault cannot be remedied by means of these instructions, or
you require spare parts or technical assistance, contact your
nearest Grundfos partner or company. See the back of these
service instructions.
State the following information when you contact Grundfos to get
help for fault finding:
• nameplate data of the pump the MGE-F is fitted to
• nameplate data of the MGE-F
• status of indicator lights on the control panel
• any alarm or warning and the corresponding fault code read
with Grundfos GO Remote.
These service instructions are published on Grundfos Product
Center.
1.4 Safety details to be aware of when working on the
product
These service instructions apply only for the MGE-F
and its user interfaces (control panel, Grundfos GO
Remote and PC Tool E-products). If the application
includes other Grundfos products or systems, refer to
the service instructions of those products.
WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply is switched off and that
it cannot be accidentally switched on.
- Wait 30 minutes before doing any work inside the
product.
- Make sure that the mains cover is fitted in MGE-F
if you perform service work where fault finding with
power on and/or with connection to PC Tool Link is
needed. Turn off power and wait for the control box
to be de-energised before you check whether the
mains cover is fitted. If the mains cover is missing,
you can order it by part number 99926860.
- Installation, commissioning, service, and
maintenance of equipment, systems, and circuits
may only be performed by Grundfos service
technicians or a Grundfos Authorised Service
Partner (ASP) who have attended training
equivalent to Grundfos Electronics Service Expert
(GESE) or similar.
- Always observe local applicable safety regulation.
WARNING
Electric shock
Death or serious personal injury
- Due to the capacitors of MGE-F, touching live
electrical parts may be fatal, even after the mains
supply has been disconnected. Disconnect the
mains supply, and wait at least 30 minutes or the
amount of time stated on the warning label under
the terminal box cover before touching any live
parts.
- Note that the relay may be connected to an
external power supply and still be live after the
mains supply to the motor has been disconnected.

English (GB)
4
2. Identification
2.1 Nameplates
The MGE-F nameplate (fig. 1) is fitted on the side of the terminal
box (fig. 2).
Fig. 1 Nameplate for MGE-F, efficiency 1 motor
Fig. 2 Position of nameplate
TM04 2002 1808TM04 2399 2508
96 348831
Type
Env.Type: 3R
P.N.
Serial No:
P.C.
PF :
U
in
I
in 1/1
f in
OUTPUT
U
out
P
2
f out
Wgt
V
kW
V
A
Hz
:
0 -
:kg
3 ~
:
Made in Hungary
INPUT
:
:
Hz
:
:
:
:
:
CL
TP 211
TAmb
IP
:C
:
:
0 -
12 3 45 6 7 8 910
11 12 13 14 15 16 17 19 20 21
22
18
Pos. Description Pos. Description
1 Type designation 12 Max. supply current at min. and max. supply voltage
2 Product number 13 Supply voltage
3 Power factor 14 Rated power
4 Production code, year/week 15 Output frequency
5 Serial number 16 Output voltage
6 Weight 17 CE mark
7 Enclosure class according to IEC 34-5 18 VDE mark
8 Maximum ambient temperature 19 Standard motor efficiency according to CEMEP
9 Motor protection according to IEC 34-11 20 C-Tick mark
10 Insulation class according to IEC 62114 21 Country of manufacture
11 Frequency 22 Bar code

English (GB)
5
The motor nameplates (fig. 3) are fitted under the terminal box (fig. 4).
Fig. 3 Nameplates for standard motors with CE and UL approvals
Fig. 4 Position of motor nameplates
2.2 Type key
TM04 3051 3508
MG180MB2-48FF300-F1
22,0 85903419
D/Y 380-415/660-690
41,5-38,5/23,8-22,8
91,9-92,8 45,5-42,5/26,0-25,0
0,91-0,89 2930-2940
D/Y 380-480/660-690
42,0-33,5/24,2-22,8
46,0-37,0/26,6-25,0
3500-3550
90,0-92,5
0,92-0,89
MG180MB2-48FF300-F1
4000
85903419
1000
40
60
UNIREX N3 ESSO
6310.C4
7310BE
15
Protector type PTC 160°C TP211
114 55 F
0931
TM04 2843 3208
Example MG E 160 M D 2- 42 FF 300 -F 1
Motor Grundfos
Electronically controlled
Frame size according to IEC
(centre line height of shaft of foot motor) [mm]
160
180
Size of foot
M
L
Length of stator core
B
D
Number of poles
2
4
Diameter of shaft end [mm]
Flange version
FF (free-hole flange)
Pitch circle diameter, flange version [mm]
Model designation for motor
F
Efficiency class for standard motor
[ ] = not stated
1 = IE2 motor
2 = IE3 motor

English (GB)
6
2.3 Configuration
The terminal box is configured from factory for the application and
the pump type the motor is to be used for. The configuration file
number appears from the terminal box configuration label which
is placed inside the terminal box on the frame of the control
panel. See figs 5 and 6.
Fig. 5 Configuration label
Fig. 6 Position of configuration label
If the terminal box is replaced or mounted on another motor, it
must be reconfigured. Contact Grundfos Service.
3. General description
Fig. 7 Block diagram showing the functional blocks of the frequency converter
TM04 2305 2308
TM04 2400 2508TM00 8679 4206
Inrush circuit
RFI
filter
Rectifier Intermediate circuit Inverter
Driver circuit
Control circuit

English (GB)
7
3.1 Wiring diagrams and signal terminals
The wiring diagram and the signal terminals depend on the pump
application. Figures 8 to 11 are examples of the different
functional modules available. Refer to the figure corresponding to
the functional module fitted.
TM04 2071 1908 TM04 2072 1908
Fig. 8 I/O module and GENIbus Fig. 9 Extended I/O module and GENIbus
TM04 2073 1908 TM04 2074 1908
Fig. 10 TPED module Fig. 11 Multi-E module
96 34 88 32
NC1
C1
NO1
SIGNAL RELAY :
M AX : 250 V /2A AC 1
MIN: 5V/10mA
CONNECTION
FOR PC- TOOL
NC2
C2
NO2
SIGNAL RELAY :
M AX : 250 V/2 A AC1
MIN: 5V/10mA
STATUS L ED
OPTIO NAL
7: SENSOR I N PUT
8: +24V
9: GND
1: DIGITAL INPUT
0- 10 V
0/4-20mA
A: RS485 A
Y: RS485 GND
B: RS485 B
0 - 10V
+
2: RUN/STOP
3: GN D
4: SETPOINT
5: +10V
6: GN D
10k
0/4 - 20mA
SUPPLY :
SEE NAMEPLATE :
FOR FURTHER DATA: L1
L2
L3
PE
OP TI ON AL
96348833
CONNECTION
FOR PC-TOOL
NC1
C1
NO1
SIGNAL RELAY :
M AX: 250 V/2 A AC1
MIN: 5V/10mA
NC2
C2
NO2
SIGNAL RELAY :
M AX : 250 V /2A AC 1
MIN: 5V/10mA
L3
L2
L1
SUPPLY :
SEE NAMEPLATE :
FOR FURTHER DATA:
17: PT100 A
18: PT100 A
19: PT100 B
20: PT100 B
STATUS L ED
7: SENSOR I NPUT
8: +24V
9: GND
0-10V
0/ 4 -2 0 mA
1: DIGITAL INPUT 2
10: DIGITAL INPUT 3
11: DIGITAL INPUT 4
12: ANALOG OUTPUT
13: GND
14: SENSOR INPUT 2
15: +24V (2)
16: GND
0- 10 V
0/4-20mA
A: RS485 A
Y: RS485 GN D
B: RS485 B
+
0-10V
0/4 - 20 mA
2: RUN/STOP
3: GND
4: SETPOINT
5: +10V
6: GND
10k
PE
96348945
NC1
C1
NO1
SIGNAL RELAY :
M AX: 250 V/2 A AC1
MIN: 5V/10mA
CONNECTION
FOR PC -TOOL
NC2
C2
NO2
SIGNAL RELAY :
MAX: 250V/2A AC 1
MIN: 5V/10mA
TPE D
0 - 1 0 V
+
2: RUN/STOP
3: GND
4: SETPOINT
5: +10V
6: GN D
10k
0/ 4 - 2 0m A
SUPPLY :
SEE NAMEPLATE
FOR FURTHER DATA L1
L2
L3
PE
A: RS485A
Y: RS485 GND
B: RS485B
7: SENSOR I NPU T
8: +24V
9: GND
1: DIGITAL INPUT 1
0- 10 V
0/4-20mA
CONNECTION FOR
TWIN PUMP
TWIN PUMP
SWITCH
STATUS L ED
96348946
NC1
C1
NO1
SIGNAL RELAY :
MAX: 250 V/2A AC1
MIN: 5V/10mA
CONNECTION
FOR PC- TOOL
NC2
C2
NO2
SIGNAL RELAY :
MAX: 250 V/2A AC1
MIN: 5V/10mA
Multi-E
0 - 10V
+
2: RUN/STOP
3: GND
4: SETPOI NT
5: +10V
6: GN D
10k
0/4 - 20mA
SUPPLY :
SEE NAMEPLATE
FOR FURTHER DATA L1
L2
L3
PE
A: RS485A (ext. bus)
Y: RS485 GND (ext. bus)
B: RS485B (ext. bus)
A1: RS485A (int. bus)
Y: RS485 GND (int. bus)
B1: RS485B (int. bus)
7: SENSOR I NPU T
8: +24V
9: GND
1: DIGITAL INPUT 1
0-10V
0/4-20mA
STATUS L ED

English (GB)
8
3.2 Control panel
Fig. 12 CRE and TPE, TPED
Fig. 13 TPE, TPED Series 2000
3.2.1 Operation
The motor control panel has the following buttons and indicator
lights:
• Buttons and for setting of setpoint.
• Light fields, yellow, for indication of setpoint.
• Indicator lights, green (operation) and red (fault).
Switch control mode by pressing in this sequence:
• constant pressure,
• proportional pressure, .
Set the pump head by pressing or .
The light fields of the control panel will indicate the set head
(setpoint).
3.3 Indicator lights
3.3.1 Indicator lights on the control panel
The indicator lights on the control panel show the MGE-F motor's
operating and alarm condition.
See section 4.6 Fault finding using the indicator lights on the
control panel to get an overview of the meaning of the indicator
lights.
3.3.2 Indicator lights inside the terminal box
The indicator lights beside the terminal block on the control board
normally have the same functions as the indicator lights on the
control panel. See fig. 14.
Fig. 14 Indicator lights inside the terminal box
See section 4.6 Fault finding using the indicator lights on the
control panel to get an overview of the meaning of the indicator
lights.
TM02 8513 0304
TM03 0126 4104
WARNING
Electric shock
Death or serious personal injury
- Make sure that the mains cover is fitted in MGE-F
if you perform service work where fault finding with
power on and/or with connection to PC Tool Link is
needed. Turn off power and wait for the control box
to be de-energised before you check whether the
mains cover is fitted. If the mains cover is missing,
you can order it by part number 99926860.
In case of certain faults in the electronics, the
indicator lights on the control panel may indicate
differently from the indicator lights on the control
board. In these cases, the indicator lights on the
control board indicate the current operating and
alarm condition.
TM04 2569 4620
Indicator lights for operation and alarm on the
control panel

English (GB)
9
4. Fault finding
4.1 Safety instructions
4.2 Fault finding procedure
Fault finding is based on these sections in this order:
•4.3 Operating conditions
•4.5 Fault observations
•4.6 Fault finding using the indicator lights on the control panel
•4.7 Fault finding using alarm and warning codes
•8. Tightening torques and lubrication.
The necessary tools for the fault finding can be seen in section
9. Service tools.
4.3 Operating conditions
Correct functioning of the MGE-F depends on these points:
Mains supply
• Check nameplate data, and measure the actual supply voltage
with a digital voltmeter (true RMS).
• Check the earth leakage circuit breaker and the backup fuses.
The MGE-F has no internal fuses.
Pump and motor load
• Check nameplate data, and measure the actual current
consumption with a digital amperemeter (true RMS). Do the
pump and the MGE-F match?
External signals, for instance from another controller
• Check that the external signals are suitable for the MGE-F.
See section 3.1 Wiring diagrams and signal terminals and
installation and operating instructions for MGE 160 and MGE
180.
• Check that terminals 2 and 3 are connected and that the MGE-
F has been started via the control panel.
Sensors connected
• Check that the sensor measuring range matches the pump
application.
• Check that the settings of the MGE-F match the sensors
(current, voltage, minimum and maximum values).
Condensation
• Check whether condensation occurs in the terminal box. This
may happen if the ambient temperature becomes very low.
The problem may be overcome by enabling the standstill
heating function and by removing the drain plug in the motor.
See installation and operating instructions for MGE 160 and
MGE 180.
Electromagnetic disturbances
• Check that the wiring complies with the EMC Directive. See
installation and operating instructions for MGE 160 and MGE
180.
Start-up, installation and operating settings via the control
panel or Grundfos GO Remote
• Check that the green indicator light on the control panel (or
inside the terminal box) is on.
• Check that the settings in Grundfos GO Remote match the
pump application.
The menu displays are described in detail in the installation
and operating instructions for MGE 160 and MGE 180.
If the above points are according to the installation and operating
instructions for MGE 160 and MGE 180 and the pump application,
but a fault still exists and the red indicator light is on, continue the
fault finding in sections 4.6 Fault finding using the indicator lights
on the control panel and 4.7 Fault finding using alarm and
warning codes.
WARNING
Electric shock
Death or serious personal injury
- Due to the capacitors of MGE-F, touching live
electrical parts may be fatal, even after the mains
supply has been disconnected. Disconnect the
mains supply, and wait at least 30 minutes or the
amount of time stated on the warning label under
the terminal box cover before touching any live
parts.
- Make sure that the mains cover is fitted in MGE-F
if you perform service work where fault finding with
power on and/or with connection to PC Tool Link is
needed. Turn off power and wait for the control box
to be de-energised before you check whether the
mains cover is fitted. If the mains cover is missing,
you can order it by part number 99926860.
- Note that the relay may be connected to an
external power supply and still be live after the
mains supply to the motor has been disconnected.
- Installation, commissioning, service, and
maintenance of equipment, systems, and circuits
may only be performed by Grundfos service
technicians or a Grundfos Authorised Service
Partner (ASP) who have attended training
equivalent to Grundfos Electronics Service Expert
(GESE) or similar.
- Always observe local applicable safety regulation.
CAUTION
Hot surface
Minor or moderate personal injury
- MGE-F may be hot.

English (GB)
10
4.4 PC Tool E-products as service tool
PC Tool E-products is a software tool which enables
communication with GENIbus products from a PC using Microsoft
Windows.
PC Tool E-products can be used for fault correction of E-products,
including the MGE-F.
4.4.1 Acquisition of PC Tool E-products
PC Tool E-products can be acquired via the Grundfos GTI
database.
4.4.2 Connecting the PC Tool Link to the MGE-F
PC Tool Link is used for the physical connection between the PC and the MGE-F. PC Tool Link converts RS-485 used by the MGE-F to
USB used by the PC. PC Tool Link also provides galvanic separation between the MGE-F and the PC.
Fig. 15 Example of connection of a PC to the MGE-F
4.5 Fault observations
4.5.1 Condensation in the terminal box
WARNING
Electric shock
Death or serious personal injury
- When making the wiring connections for PC-Tool
Link, make sure that the power is switched off and
wait 30 minutes. Connect the cable through the
cable glands, and mount the cover before
switching on the power.
- Make sure that the mains cover is fitted in MGE-F
if you perform service work where fault finding with
power on and/or with connection to PC Tool Link is
needed. Turn off power and wait for the control box
to be de-energised before you check whether the
mains cover is fitted. If the mains cover is missing,
you can order it by part number 99926860.
USB-A / USB-B cable
PC Tool Link
TTL cable
Description Condensation in the terminal box.
Explanation
During standstill, the motor temperature will
fall below the dew point of the surrounding
air. Then the humidity in the air may
condensate and settle on the surface of the
terminal box.
Check/remedy Activate Standstill heating.

English (GB)
11
4.6 Fault finding using the indicator lights on the control panel
The operational state of the motor incl. possible faults can be
read via the indicator lights on the control panel.
If Grundfos GO Remote is available, we recommend you to start
fault finding via the fault codes.
See section 4.7 Fault finding using alarm and warning codes.
In case of certain faults in the electronics, the
indicator lights on the control panel may indicate
differently from the indicator lights on the control
board. In these cases, the indicator lights on the
control board indicate the current operating and
alarm condition.
Indicator lights
Condition/cause Remedy
Green Red
On On
Normal operation + indication of previous fault
1. The pump is running at
normal performance.
– The pump's duty/standby
function has been
activated, but there is no
communication with the
standby pump.
a) Has the power supply to the standby pump been switched off?
YES:
NO:
Re-establish the power supply.
Proceed to point b).
b) Has the communication cable been disconnected?
YES:
NO:
Check the communication cable.
Contact Grundfos Service.
2. The pump is running at
maximum speed.
– The sensor signal is
outside the set signal
range.
a) Does the sensor setting correspond to the sensor type installed? (0-10
V, 0-20 mA, 4-20 mA)
NO:
YES:
Correct the setting using Grundfos GO Remote or PC-Tool
E-Products.
Proceed to point b).
b) Is the voltage to the sensor connection 24 VDC?
TM02 1606 4720TM04 2072 4720
NO Replace the I/O module.
YES Proceed to point c).
c) Is the sensor signal
– below 10 V (type 0-10 V sensor)?
– below 20 mA (type 0-20 mA sensor)?
– between 4 and 20 mA (type 4-20 mA sensor)?
TM02 1604 1601TM04 2072 1908
NO:
YES:
Replace the sensor.
Proceed to point d).
d) Has the sensor been connected correctly, and does the sensor signal
correspond to the system pressure?
NO:
YES:
Connect the sensor signal correctly.
Replace the I/O module or the terminal box.
If the sensor is defective, replace it.
8: +24V
9: GND
A: RS4 8 5
Y:RS485
14: SENSOR IN
15: +24V (2)
16: GND
7: SENSOR INPUT
8: +24V
9: GND
4-20mA
+
OUT
0-10V
0/4-20mA
- +OUT
GU
12: ANALOG OUTPUT
13: GND
14: SENSOR INPUT 2
15: +24V (2)
16: GND
0- 10 V
0/4-20mA

English (GB)
12
On On
3. The pump is running at
minimum speed.
– The setpoint signal is
outside the set signal
range.
a) Set the pump to "open loop" operation, and connect 10 V supply to the
setpoint input.
Does the pump switch to maximum speed?
NO:
YES:
Proceed to point b).
The pump is OK.
b) Does the setpoint setting correspond to the setpoint type installed? (0-
10 V, 0-20 mA, 4-20 mA)
NO:
YES:
Correct the setting using Grundfos GO Remote or PC-Tool
E-products.
Proceed to point c).
c) Is the voltage to the setpoint connection 10 VDC?
TM02 1607 4720
NO:
YES:
Replace the terminal box.
Proceed to point d).
d) Is the setpoint signal
– below 10 V (type 0-10 V sensor)?
– below 20 mA (type 0-20 mA sensor)?
– between 4 and 20 mA (type 4-20 mA sensor)?
NO:
YES:
Check for fault in the external setpoint signal.
Re-establish the correct setpoint signal, if necessary.
If the pump still does not run correctly, replace the terminal
box.
On Off
Normal operation
1. The pump is running.
– Normal operational state.
2. The pump is not running.
Operational stop which may
be caused by
– the flow switch connected
– the pump stop function.
a) The flow switch is closed.
Is there 5 VDC across terminals 1-9?
(If an extended I/O module is installed, the flow switch may be
connected to DI3 (terminals 9-10) or DI4 (terminals 9-11)).
NO:
YES:
Flow switch closed = Pump is not supposed to run.
Flow switch open = Pump must be running.
If the flow switch is defective, replace it.
The connection of a flow switch depends on the MGE functional
modules. See the wiring diagrams in figs 8 to 11.
Does the pump start when the connection between the flow switch
terminals is cut?
NO:
YES:
Replace the I/O module.
The digital input is OK.
The flow switch is defective. Replace it.
b) The stop function has stopped the pump.
Does the pump start when you increase the flow and/or reduce the
pressure in the system?
NO:
YES:
If the sensor is OK, replace the terminal box.
The input is OK.
Indicator lights
Condition/cause Remedy
Green Red
0-10V
+
-
0/4-20mA 10K
4: SETPOINT
5: +10V
6: GND

English (GB)
13
On Off
3. The pump is running at
unexpectedly high or low
speed.
– Can be caused by fault in
installation, setting or
signal from setpoint/sensor
or that the sensor input
has been set to "active".
a) Has the correct setpoint type been set in the motor? (0-10 V, 0-20 mA,
4-20 mA).
NO:
YES:
Correct the setting using Grundfos GO Remote or PC-Tool
E-products.
Proceed to point b).
b) Has the external setpoint signal from potentiometer or external
controller been connected correctly?
TM02 1606 1601
NO:
YES:
Connect the setpoint signal correctly.
Proceed to point c).
c) Has the correct sensor type been set in the motor? (0-10 V, 0-20 mA,
4-20 mA)
NO:
YES:
Correct the setting using Grundfos GO Remote or PC-Tool
E-products.
Proceed to point d).
d) Has the sensor been connected correctly, and does the sensor signal
correspond to the system pressure?
TM02 1604 0601TM04 2072 1908
NO:
YES:
Connect the sensor signal correctly.
If the pump does not run correctly, replace the I/O module
or the terminal box.
If the sensor is defective, replace it.
Off Off
The pump is not running
1. The power supply to the
motor has been cut. Re-establish correct power supply.
2. The control panel or one of
the functional modules is
defective.
Switch off the power supply. Then remove the control panel and the
functional modules, one at a time, and switch on the power supply every
time a component has been removed. When the fault has disappeared
after switching on the power supply, the defective component has been
localised and can be replaced.
3. The terminal box is
defective. Replace the terminal box, or contact Grundfos Service.
Indicator lights
Condition/cause Remedy
Green Red
0-10V
+
-
0/4-20mA 10K
4: SETPOINT
5: +10V
6: GND
7: SENSOR INPUT
8: +24V
9: GND
4-20mA
+
OUT
0-10V
0/4-20mA
- +OUT
GU
12: ANALOG OUTPUT
13: GND
14: SENSOR INPUT 2
15: +24V (2)
16: GND
0- 10 V
0/4-20mA

English (GB)
14
Off On
The pump has stopped due to a fault
The pump has been stopped
due to one of the following
causes:
See the fault indication on Grundfos GO Remote or PC Tool E-products.
1. The pump is blocked or
overloaded. Remove the blockage, or reduce the load.
2. The ambient temperature is
too high, or the cooling is
insufficient.
Re-establish sufficient cooling.
3. Power supply fault:
– undervoltage
– overvoltage
– phase failure
– mains supply failure.
Check that the supply voltage at the source is within the stated voltage
range.
If not, re-establish correct power supply.
4. External fault. a) Has the digital input been set to external fault?
NO: Correct the setting using Grundfos GO Remote or PC-Tool
E-products.
YES: Proceed to point b).
b) Check the external contactor for continuity when closed across
terminals 1-9.
TM02 1605 0601
NO: Contact between terminals 1 and 9 is closed.
Seek the cause of fault in external signal transmitter.
YES: Contact between terminals 1 and 9 is open.
The E-pump is OK. Proceed to the next fault possibility.
5. Other faults:
– wrong terminal box
– wrong configuration
– fatal fault.
• Replace the terminal box.
• Reconfigure the terminal box.
• Replace the terminal box.
Flashing,
1 Hz Off
Normal operational stop
The pump has been stopped
• with the button
• with Grundfos GO Remote
• using the Grundfos GENIbus
• by the motor start/stop function. (Input on terminal 2-3 is open).
Flashing,
1 Hz On
Normal operational stop + indication of previous fault
The pump has been stopped
• with the button
• with Grundfos GO Remote
• using the Grundfos GENIbus
• by the motor start/stop function, but was previously stopped due to a fault which has now disappeared.
Flashing,
5 Hz On
The pump has been stopped due to a fault in the product
Pump is not running and
• communication with
Grundfos GO Remote is not
possible
• no reaction when you press
or
• fatal internal communication
fault in the pump.
Try resetting the fault by
• disconnecting the power supply
• waiting until all diodes are off
• re-establishing the power supply.
If this does not remedy the fault, the terminal box is defective. Replace the
terminal box.
Indicator lights
Condition/cause Remedy
Green Red
9: GND
1: DIGITAL INPUT
0/1

English (GB)
15
4.7 Fault finding using alarm and warning codes
Apart from being indicated by the indicator lights on the control
panel, alarms, warnings and their fault codes can be read using
Grundfos GO Remote or PC-Tool E-Products.
4.7.1 Alarm and warning list
The list below gives you an overview of the possible alarms and
warnings and a description of their causes and suggestions for
remedy.
These abbreviations are used in the column "Fault type":
W: Warning.
A: Alarm.
1): The alarm can be configured to Warn/Max/Min/Stop/User
using the PC Tool E-products.
Fault code Fault reading in Grundfos GO Remote Fault reading in PC Tool E-products Fault type
Explanation/cause Remedy
3 External fault External fault signal A
The digital input set for "External fault" was or is closed
(terminal 1, 10 or 11).
When the digital input is no longer closed, the fault indication can be reset with
Grundfos GO Remote, PC-Tool E-Products or by pressing or .
4 Too many restarts Too many restarts (from standby mode per 24) A
• The number of attempted restarts at 10-second
intervals after a fault has exceeded four within one
minute.
• The number of attempted restarts at five-minute
intervals after a fault has exceeded 16 within 24
hours.
Seek the cause under the fault log code numbers in Grundfos GO Remote or
PC-Tool E-Products.
The pump will automatically attempt to restart after 24 hours.
The fault indication can be reset with Grundfos GO remote, PC-Tool E-
Products or by pressing or .
30 Replace motor bearings Motor bearings need change (service information) W
The motor has reached the number of operating hours
for the bearing service life that is stated in the
configuration.
Replace the bearings. See section 5.2 Replacement of motor bearings.
31 Replace varistor Motor varistor(s) need change (service information) W
The varistor has been exposed to the allowable number
of transients and needs replacing. Contact Grundfos Service.
32 Overvoltage Overvoltage A
The supply voltage has been or is too high. Reduce the voltage to the specified level (see the nameplate).
40 Undervoltage Undervoltage A
The supply voltage has been or is too low. Increase the voltage to the specified level (see the nameplate).
41 Undervoltage Undervoltage transient A
There has been a voltage drop in the supply voltage
caused by one of the following:
• Supply cable too small.
• Another big user is supplied from the same panel.
45 Mains voltage asymmetry Voltage asymmetry A
The supply voltage has been or is asymmetric. Check the supply voltage at the source while the motor is loaded.
49 Overload Overcurrent (i_line, i_dc, i_mo) A
The terminal box or the motor is heavily overloaded.
Cause:
• Blocked pump. • Remove the blockage.
• Blocked rotor. • Remove the blockage.
• Continued overload. • Reduce the load.
• Incorrect configuration of the terminal box. • Contact Grundfos Service.
• Wrong terminal box. • Contact Grundfos Service.
• Fault in stator windings. • Contact Grundfos Service.
• Power supply failure (phase failure). • Re-establish correct power supply.
51 Overload Blocked motor/pump A
The pump is blocked during start-up which causes a
heavy overload. The input current is very high; the
motor P > 120 % for 60 seconds.
Remove the blockage.

English (GB)
16
55 Overload Motor current protection activated (MCP) A
The built-in motor-current protection function has
registered a continued overload of more than 125 % of
rated current for 60 seconds.
Cause:
• Continued overload. • Reduce the load by limiting the pump flow.
• Incorrect configuration of the terminal box. • Contact Grundfos Service.
• Fault in stator windings. • Contact Grundfos Service.
56 Underload Underload A
The motor is underloaded.
Cause:
• Incorrect configuration of the terminal box. • Check the settings of the terminal box.
• The pump has run dry. • Make sure that all valves in the piping system are open and that there is
water in the piping system.
57 Dry running Dry running A
The pump has run dry. Make sure that all valves in the piping system are open and that there is water
in the piping system.
65 Too high motor temperature Motor temperature A
The temperature sensor in the motor has measured a
too high winding temperature.
Cause:
• Dust and dirt in the cooling fins. • Clean the cooling fins.
• Too high ambient temperature. • Improve the cooling.
• Fault in stator windings. • Contact Grundfos Service.
73 Undervoltage Hardware shutdown (HSD) A
The current limit of the electronic module has been
exceeded.
Cause:
• Incorrect configuration of the terminal box. • Contact Grundfos Service.
• Fault in stator windings. • Contact Grundfos Service.
• Terminal box defective. • Contact Grundfos Service.
77 Duty/standby, Communication fault Twin pump communication fault W
Communication between the two pumps which have
been set to duty/standby function has been interrupted.
Cause:
• Power supply to standby pump has been cut. • Re-establish the power supply.
• Communication cable has been cut. • Check the communication cable.
• Communication module defective. • Replace communication module.
85 Other fault Freq. converter parameter verification error (EEPROM) A
The EEPROM has lost its contents. Contact Grundfos Service.
88 Sensor 1 signal outside signal range General sensor signal fault / feedback sensor signal
fault 1)
Sensor signal type 4-20 mA: signal below 2 mA or
above 22 mA.
Sensor signal type 0-20 mA: signal above 22 mA.
Sensor signal type 0-10 V: signal above 11 V.
• Signal range set incorrectly. • Correct the signal range setting.
• Sensor incorrectly connected. • Connect the sensor correctly.
• Sensor defective. • Replace the sensor.
• Sensor cable defective. • Check the sensor cable.
• Incorrect power supply to sensor. • Replace the functional module.
91 Temperature sensor 1 signal outside
signal range Temperature sensor 1 signal fault 1)
The sensor signal has been short-circuited or cut. Replace the temperature sensor.
Before doing any work, turn off the mains switch or power off.
Fault code Fault reading in Grundfos GO Remote Fault reading in PC Tool E-products Fault type
Explanation/cause Remedy

English (GB)
17
93 Sensor 2 signal outside signal range Sensor 2 signal fault 1)
Same as fault 88. Same as fault 88.
96 Setpoint signal outside signal range Reference input signal fault 1)
Sensor signal type 4-20 mA: signal below 2 mA or
above 22 mA.
Sensor signal type 0-20 mA: signal above 22 mA.
Sensor signal type 0-10 V: signal above 11 V.
• Signal range set incorrectly. • Correct the signal range setting.
• Setpoint signal incorrectly connected. • Connect the setpoint signal correctly.
• Incorrect supply voltage to the setpoint. • Replace the functional module.
105 Overload Electronic rectifier protection activated (ERP) A
The electronic module/motor is heavily overloaded, and
the temperature of the electronics is above 100 °C.
The measured temperature can be read via PC Tool E-
products.
Cause:
• Temperature sensor defective. • Contact Grundfos Service.
• Continued overload. • Reduce the load.
• The ambient temperature is too high, or the cooling is
insufficient.
• Improve the cooling.
• Incorrect configuration of the terminal box. • Contact Grundfos Service.
106 Overload Electronic inverter protection activated (EIP) A
The electronic module/motor is heavily overloaded, and
the temperature of the electronics is above 100 °C.
The measured temperature can be read via PC Tool E-
products.
Cause:
• Temperature sensor defective. • Contact Grundfos Service.
• Continued overload. • Reduce the load.
• The ambient temperature is too high, or the cooling is
insufficient.
• Improve the cooling.
• Incorrect configuration of the terminal box. • Contact Grundfos Service.
148 DE bearing temperature high Motor drive-end (DE) bearing temp. warning limit
Motor drive-end (DE) bearing temp. alarm limit
W
A
The drive-end motor bearing has become too hot.
Cause:
• The bearing is worn. • Replace the bearing. See section 5.2 Replacement of motor bearings.
• The motor is dirty. • Check and clean, if necessary,
– the fan
– the motor cooling fins.
149 NDE bearing temperature high Motor non-drive-end (NDE) bearing temp. warning limit
Motor non-drive-end (NDE) bearing temp. alarm limit
W
A
The non-drive-end motor bearing has become too hot.
Cause:
• The bearing is worn. • Replace the bearing. See section 5.2 Replacement of motor bearings.
• The motor is dirty. • Check and clean, if necessary,
– the fan
– the motor cooling fins.
155 Undervoltage Inrush fault A
The terminal box voltage is outside the alarm limit.
Cause:
• Fault in the voltage supply. • Re-establish the voltage supply.
• Transients in the voltage supply during operation. • Contact Grundfos Service.
Fault code Fault reading in Grundfos GO Remote Fault reading in PC Tool E-products Fault type
Explanation/cause Remedy

English (GB)
18
156 Other fault Internal communication failure in frequency converter A
Internal communication fault in the pump due to defect
in the terminal box. Contact Grundfos Service.
175 Temperature sensor 2 signal outside
signal range Temperature sensor 2 signal fault 1)
Same as fault 91. Same as fault 91.
190
191
Limit 1 exceeded
Limit 2 exceeded
Limit 1 exceeded
Limit 2 exceeded 1)
This is a monitoring function offering information, alarm
or warning if a low or high limit is exceeded.
The function can only be set with the PC Tool E-
products.
The function can be set to monitor
• sensor 1 or 2
• Pt100 sensor 1 or 2
• external setpoint
• the feedback signal.
The limit set has been exceeded either upwards or
downwards.
Procedure:
1. Using PC Tool E-products, check which function is being monitored.
2. Check in the pump system whether the alarm or warning is real. If it is real,
remedy the fault.
3. If the alarm or warning seems to be wrong for the pump system,
troubleshoot according to the selected sensor using these service
instructions.
240 Relubricate motor bearings Motor bearings need lubrication (service information) W
The motor has reached the number of operating hours
stated in the configuration for the bearing lubrication. Lubricate the bearings. See section 5.1 Lubrication of motor bearings.
Fault code Fault reading in Grundfos GO Remote Fault reading in PC Tool E-products Fault type
Explanation/cause Remedy

English (GB)
19
5. Maintenance
Follow these instructions when it is necessary to maintain the
motor or the terminal box.
Position numbers of components (numbers in brackets) refer to
section 7. Drawings and diagrams.
Position letters of tools (letters in brackets) refer to section
9. Service tools.
Prior to dismantling
Disconnect the mains supply in accordance with local regulations.
During assembly
Tighten screws and nuts to the correct torque. See section
8.1 Tightening torques.
5.1 Lubrication of motor bearings
5.1.1 Grease and lubrication intervals
The recommended grease type and quantity and the
recommended lubrication intervals in hours appear from the
lubricating plate fitted to the motor. When the MGE-F has reached
the prescribed number of operating hours, it will give a lubrication
warning that will appear on Grundfos GO Remote or PC Tool E-
products. See section 4. Fault finding.
5.1.2 Lubrication procedure
Connect the grease gun to the lubricating nipples, and apply the
prescribed quantity of grease.
Confirm the lubrication in Grundfos GO Remote. Confirmation
can also be made via PC Tool E-products.
WARNING
Electric shock
Death or serious personal injury
- Installation, commissioning, service, and
maintenance of equipment, systems, and circuits
may only be performed by Grundfos service
technicians or a Grundfos Authorised Service
Partner (ASP) who have attended training
equivalent to Grundfos Electronics Service Expert
(GESE) or similar.
- Always observe local applicable safety regulation.
WARNING
Electric shock
Death or serious personal injury
- Due to the capacitors of MGE-F, touching live
electrical parts may be fatal, even after the mains
supply has been disconnected. Disconnect the
mains supply, and wait at least 30 minutes or the
amount of time stated on the warning label under
the terminal box cover before touching any live
parts.
- Note that the relay may be connected to an
external power supply and still be live after the
mains supply to the motor has been disconnected.
- Make sure that the mains cover is fitted in MGE-F
if you perform service work where fault finding with
power on and/or with connection to PC Tool Link is
needed. Turn off power and wait for the control box
to be de-energised before you check whether the
mains cover is fitted. If the mains cover is missing,
you can order it by part number 99926860.
CAUTION
Hot surface
Minor or moderate personal injury
- MGE-F may be hot.
The motor must be running during the lubrication.
This ensures that the new grease is distributed
evenly and that the old grease is pressed out of the
bearing.

English (GB)
20
5.2 Replacement of motor bearings
When the MGE-F has reached the prescribed number of
operating hours, it will give a warning about replacement of
bearings that will appear on Grundfos GO Remote or PC Tool E-
products. See section 4. Fault finding.
5.2.1 Removing the bearings
1. Remove the screws (pos. 152) holding the fan cover (pos.
151), and remove the fan cover.
2. Remove the retaining ring (pos. 156c) holding the fan (pos.
156).
3. Pull off the fan.
4. Remove the three screws (pos. 182a) holding the bearing
cover (pos. 155d).
5. Remove the screws (pos. 185a) holding the bearing end
shield in the non-drive end (pos. 156a).
6. Remove the bearing end shield in the non-drive end and the
spring (pos. 158).
7. Remove the screws (pos. 185) holding the bearing end shield
in the drive end (pos. 156b).
8. Carefully pull the bearing end shield in the drive end and the
shaft/rotor (pos. 172) out of the stator housing. Take care not
to damage the stator windings.
9. Remove the three screws (pos. 182) holding the bearing
cover (pos. 155a).
10. Remove the bearing end shield in the drive end using a puller
(pos. B).
11. Pull bearings (pos. 153 and 154) off the shaft using a puller. If
the drive end bearing is stuck in the bearing end shield, heat
up the bearing end shield, and press the bearing out by
pushing at it through the shaft hole.
12. Clean and check the bearing journals of the shaft and the
bearing seats of the bearing end shields.
Fig. 16 Detail from fig. 24, exploded view of the MGE-F
TM04 2443 2508