Danfoss FC 300 Instruction Manual page 63

FC 300 Instruction Manual
WARNING 5
DC link voltage high:
The intermediate circuit voltage (DC) is higher than
the overvoltage limit of the control system. The
adjustable frequency drive is still active.
WARNING 6
DC link voltage low
The intermediate circuit voltage (DC) is below
the undervoltage limit of the control system. The
adjustable frequency drive is still active.
WARNING/ALARM 7
DC overvoltage:
If the intermediate circuit voltage exceeds the limit,
the adjustable frequency drive 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
[VDC]
Undervoltage 185
Voltage 205
warning low
Voltage 390/405
warning high
(w/o brake -
w/brake)
Overvoltage 410
The voltages stated are the intermediate circuit
voltage of the FC 300 with a tolerance of ± 5%.
The corresponding line voltage is the intermediate
circuit voltage (DC-link) divided by 1.35
WARNING/ALARM 8
DC undervoltage:
If the intermediate circuit voltage (DC) drops
below the "voltage warning low" limit (see table
above), the adjustable frequency drive checks
if 24 V backup supply is connected.
Warnings and Alarms
3 x 380 - 3 x 525 -
500 V 600 V
[VDC] [VDC]
373 532
410 585
810/840 943/965
855 975
MG.33.A6.22 - VLT is a registered Danfoss trademark
If no 24 V backup supply is connected, the
adjustable frequency drive trips after a given
time depending on the unit.
To check whether the supply voltage matches
the adjustable frequency drive, see the
General Specifications.
WARNING/ALARM 9
Inverter overloaded:
The adjustable frequency drive 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 adjustable frequency drive
until the counter is below 90%.
The fault is that the adjustable frequency drive is
overloaded by more than 100% for too long.
WARNING/ALARM 10
Motor ETR overtemperature:
According to the electronic thermal protection
(ETR), the motor is too hot. You can choose
whether the adjustable frequency drive should 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 overtemp:
The thermistor or the thermistor connection
is disconnected. You can choose whether the
adjustable frequency drive should give a warning
or an alarm when the counter reaches 100% in
par. 1-90. Make sure the thermistor is connected
correctly between terminal 53 or 54 (analog voltage
input) and terminal 50 (+ 10 V supply), or between
terminal 18 or 19 (digital input PNP only) and
terminal 50. If a KTY sensor is used, make sure the
connection between terminal 54 and 55 is correct.
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).
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