Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual page 85

®
VLT AutomationDrive FC 300 Operating
Instructions
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:
Alarm/warning limits:
FC 300 Series 3 x 200 -
Undervoltage
Voltage
warning low
Voltage
warning high
(w/o brake -
w/brake)
Overvoltage
The voltages stated are the intermediate circuit
voltage of the FC 300 with a tolerance of ± 5
%. The corresponding mains voltage is the in-
termediate 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 ta-
ble 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
cations
WARNING/ALARM 9, Inverter overloa-
ded:
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.
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
3 x 380 - 3 x 525 -
240 V 500 V
[VDC] [VDC]
185 373
205 410
390/405 810/840 943/965
410 855
General Specifi-
.
MG.33.A9.02 - VLT is a registered Danfoss trademark
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 rea-
ches 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 when the counter reaches 100% in par.
1-90. Check that the thermistor is connected
correctly between terminal 53 or 54 (analog
600 V
voltage input) and terminal 50 (+ 10 V sup-
[VDC]
532
ply), or between terminal 18 or 19 (digital
585
input PNP only) and terminal 50. If aKTY sen-
soris used, check for correct connection be-
tween terminal 54 and 55.
WARNING/ALARM 12, Torque limit:
The torque is higher than the value in par.
975
4-16 (in motor operation) or the torque is
higher than the value in par. 4-17 (in regen-
erative 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
converter trips and issues an alarm. Turn off
the frequency converter and check if the mo-
tor shaft can be turned and if the motor size
matches the frequency converter.
If extended mechanical brake control is selec-
ted, trip can be reset externally.
ALARM 14, Earth fault:
There is a discharge from the output phases
to earth, either in the cable between the fre-
quency converter and the motor or in the
motor itself.
Turn off the frequency converter and remove
the earth fault.
ALARM 15, Incomplete hardware:
A fitted option is not handled by the present
control 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.
6. Troubleshooting
6
85