Fault Finding Using Alarm And Warning Codes - Grundfos MGE F Service Instructions Manual

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
Explanation/cause
3 External fault
The digital input set for "External fault" was or is closed
(terminal 1, 10 or 11).
4 Too many restarts
• 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.
30 Replace motor bearings
The motor has reached the number of operating hours
for the bearing service life that is stated in the
configuration.
31 Replace varistor
The varistor has been exposed to the allowable number
of transients and needs replacing.
32 Overvoltage
The supply voltage has been or is too high.
40 Undervoltage
The supply voltage has been or is too low.
41 Undervoltage
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
The supply voltage has been or is asymmetric.
49 Overload
The terminal box or the motor is heavily overloaded.
Cause:
• Blocked pump.
• Blocked rotor.
• Continued overload.
• Incorrect configuration of the terminal box.
• Wrong terminal box.
• Fault in stator windings.
• Power supply failure (phase failure).
51 Overload
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.
Fault reading in PC Tool E-products
Remedy
External fault signal
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
Too many restarts (from standby mode per 24)
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
Motor bearings need change (service information)
Replace the bearings. See section
Motor varistor(s) need change (service information)
Contact Grundfos Service.
Overvoltage
Reduce the voltage to the specified level (see the nameplate).
Undervoltage
Increase the voltage to the specified level (see the nameplate).
Undervoltage transient
Voltage asymmetry
Check the supply voltage at the source while the motor is loaded.
Overcurrent (i_line, i_dc, i_mo)
• Remove the blockage.
• Remove the blockage.
• Reduce the load.
• Contact Grundfos Service.
• Contact Grundfos Service.
• Contact Grundfos Service.
• Re-establish correct power supply.
Blocked motor/pump
Remove the blockage.
or
.
5.2 Replacement of motor bearings.
Fault type
A
.
A
W
W
A
A
A
A
A
A
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