FC 300 Operating Instructions
Troubleshooting
WARNING 1
10 Volts low:
The 10 V voltage from terminal 50 on the control
card is below 10 V.
Remove some of the load from terminal 50, as the
10 V supply is overloaded. Max. 15 mA or minimum
590 Ω.
WARNING/ALARM 2
Live zero error:
The signal on terminal 53 or 54 is less than 50%
of the value set in par. 6-10, 6-12, 6-20, or 6-22
respectively.
WARNING/ALARM 3
No motor:
No motor has been connected to the output of the
frequency converter.
WARNING/ALARM 4
Mains phase loss:
A phase is missing on the supply side, or the mains
voltage imbalance is too high.
This message also appears in case of a fault in the
input rectifier on the frequency converter.
Check the supply voltage and supply currents to
the frequency converter.
WARNING 5
DC link voltage high:
The intermediate circuit voltage (DC) is higher than
the overvoltage limit of the control system. The
frequency converter is still active.
WARNING 6:
DC link voltage low
The intermediate circuit voltage (DC) is below the
undervoltage limit of the control system. The
frequency converter is still active.
WARNING/ALARM 7
DC over voltage:
If the intermediate circuit voltage exceeds the limit,
the frequency converter trips after a time.
Possible corrections:
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
Connect a brake resistor. Extend the ramp time
Alarm/warning limits:
FC 300 Series
3 x 200 -
240 V
3 x 380 -
500 V
3 x 525 -
600 V
[VDC]
[VDC]
[VDC]
Undervoltage
185
373
532
Voltage
warning low
205
410
585
Voltage
warning high
(w/o brake -
w/brake)
390/405
810/840
943/965
Overvoltage
410
855
975
The voltages stated are the intermediate circuit
voltage of the FC 300 with a tolerance of ± 5 %. The
corresponding mains voltage is the intermediate
circuit voltage (DC-link) divided by 1.35
WARNING/ALARM 8
DC under voltage:
If the intermediate circuit voltage (DC) drops below
the “voltage warning low” limit (see table above),
the frequency converter checks if 24 V backup
supply is connected.
If no 24 V backup supply is connected, the frequency
converter trips after a given time depending on the
unit.
To check whether the supply voltage matches the
frequency converter, see
General Specifications
.
WARNING/ALARM 9
Inverter overloaded:
The frequency converter is about to cut out because
of an overload (too high current for too long). The
counter for electronic, thermal inverter protection
gives a warning at 98% and trips at 100%, while
giving an alarm. You cannot reset the frequency
converter until the counter is below 90%.
The fault is that the frequency converter is
overloaded by more than 100% for too long.
WARNING/ALARM 10
Motor ETR over temperature:
According to the electronic thermal protection
(ETR), the motor is too hot. You can choose if you
want the frequency converter to give a warning or
an alarm when the counter reaches 100% in par.
1-90. The fault is that the motor is overloaded by
more than 100% for too long. Check that the motor
par. 1-24 is set correctly.
WARNING/ALARM 11
Motor thermistor over temp:
The thermistor or the thermistor connection is
disconnected. You can choose if you want the
frequency converter to give a warning or an alarm
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MG.33.A2.02 - VLT is a registered Danfoss trademark