Dc Link Voltage High; Dc Link Voltage Low; Dc Overvoltage; Dc Under Voltage - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
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 mini-
mum 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 fre-
quency 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
Troubleshooting
WARNING/ALARM 8

DC under voltage:

If the intermediate circuit voltage (DC) drops be-
low 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 fre-
quency converter trips after a given time depend-
ing 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 be-
cause 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 over-
loaded 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 mo-
tor par. 1-24 is set correctly.
WARNING/ALARM 11
Motor thermistor over temp:
The thermistor or the thermistor connection is dis-
connected. You can choose if you want the fre-
quency converter to give a warning or an alarm
when the counter reaches 100% in par. 1-90.
®
MG.33.B8.02 - VLT is a registered Danfoss trademark
Alarm/warning limits:
FC 300 Series 3 x 200 -
240 V
[VDC]
Undervoltage 185
Voltage warn- 205
ing low
Voltage warn- 390/405
ing high (w/o
brake - w/
brake)
Overvoltage 410
The voltages stated are the intermediate circuit volt-
age of the FC 300 with a tolerance of ± 5 %. The
corresponding mains voltage is the intermediate cir-
cuit voltage (DC-link) divided by 1.35
3 x 380 - 3 x 525 -
500 V 600 V
[VDC] [VDC]
373 532
410 585
810/840 943/965
855 975
153