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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. conv. 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.
• Incorrect power supply to sensor.
• Check the power supply from the terminal box. If it is not 24 V ± 1 V,
replace the terminal box.
• Sensor defective.
• Replace the sensor.
• Sensor cable defective.
• Check the sensor cable.
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.
Fault code Fault reading in the R100
Fault reading in PC Tool E-products
Fault type
Explanation/cause
Remedy
