Danfoss FC 300 Design Manual page 296

FC 300 Design Guide
Select Over Voltage Control function in
par. 2-17
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
Selecting OVC function will extend the ramp
times.
Alarm/warning limits:
FC 300 Series 3 x 200-240 V
AC
Undervoltage
Voltage warning low
Voltage warning
high (w/o brake - w/
brake)
Overvoltage
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
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 nominal current 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.
296
Troubleshooting
3 x 380-500 V
AC
[VDC] [VDC]
185 373
205 410
390/405 810/840
410 855
MG.33.B7.02 - VLT is a registered Danfoss trademark
1-90. The fault is that the motor is overloaded by
more than nominal current 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 dis-
connected. You can choose if you want the fre-
quency converter to give a warning or an alarm in
par. 1-90. Check that the thermistor is connected
correctly between terminal 53 or 54 (analog volt-
age input) and terminal 50 (+ 10 Volts supply), or
between terminal 18 or 19 (digital input PNP only)
and terminal 50. If a KTY sensor is used, check
for correct connection between terminal 54 and
55.
WARNING/ALARM 12
Torque limit:
The torque is higher than the value in par. 4-16
(in motor operation) or the torque is higher than
the value in par. 4-17 (in regenerative operation).
WARNING/ALARM 13
Over Current:
The inverter peak current limit (approx. 200% of
the rated current) is exceeded. The warning will
last approx. 8-12 sec., then the frequency con-
verter trips and issues an alarm. Turn off the fre-
quency converter and check if the motor shaft can
be turned and if the motor size matches the fre-
quency converter.
ALARM 14
Earth fault:
There is a discharge from the output phases to
earth, either in the cable between the frequency
converter and the motor or in the motor itself.
Turn off the frequency converter and remove the
earth fault.
ALARM 15
In-complete hardware:
A fitted option is not handled by the present con-
trol board (hardware or software).
ALARM 16
Short-circuit:
There is short-circuiting in the motor or on the
motor terminals.
Turn off the frequency converter and remove the
short-circuit.
WARNING/ALARM 17
Control word timeout:
There is no communication to the frequency con-
verter.