Danfoss VLT AutomationDrive FC 301, Operating Instructions Manual, Page: 44 / 84

Troubleshooting
•
Remove the power and check if the motor shaft
can be turned.
•
Check that the motor size matches the frequency
converter.
•
Check that the motor data is correct in
parameters 1–20 to 1–25 .
ALARM 14, Earth (ground) fault
There is current from the output phase to ground, either in
the cable between the frequency converter and the motor,
or in the motor itself. Ground fault is detected by the
current transducers that measure current going out from
the frequency converter and current going into the
frequency converter from the motor. Ground fault is issued
if the deviation of the 2 currents is too large (the current
going out of the frequency converter should be the same
as the current going into the frequency converter).
Troubleshooting
•
Remove power to the frequency converter and
repair the ground fault.
•
Check for ground faults in the motor by
measuring the resistance to ground of the motor
cables and the motor with a megohmmeter.
•
Reset any potential individual offset in the 3
current transducers in FC 302. Perform the
manual initialisation or perform a complete AMA.
This method is most relevant after changing the
power card.
ALARM 15, Hardware mismatch
A fitted option is not operational with the present control
board hardware or software.
Record the value of the following parameters and contact
Danfoss:
•
Parameter 15-40 FC Type .
•
Parameter 15-41 Power Section .
•
Parameter 15-42 Voltage .
•
Parameter 15-43 Software Version .
•
Parameter 15-45 Actual Typecode String .
•
Parameter 15-49 SW ID Control Card .
•
Parameter 15-50 SW ID Power Card .
•
Parameter 15-60 Option Mounted .
•
Parameter 15-61 Option SW Version (for each
option slot).
ALARM 16, Short circuit
There is short-circuiting in the motor or motor wiring.
Troubleshooting
•
Remove the power to the frequency converter
and repair the short circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning is only active when
parameter 8-04 Control
Word Timeout Function is NOT set to [0] Off .
If parameter 8-04 Control Word Timeout Function is set to [5]
Stop and Trip , a warning appears, and the frequency
converter ramps down to a stop and shows an alarm.
Troubleshooting
•
Check the connections on the serial communi-
cation cable.
•
Increase parameter 8-03 Control Word Timeout
Time .
•
Check the operation of the communication
equipment.
•
Verify a proper installation based on EMC
requirements.
WARNING/ALARM 20, Temp. input error
The temperature sensor is not connected.
WARNING/ALARM 21, Parameter error
The parameter is out of range. The parameter number is
reported in the display.
Troubleshooting
•
Set the affected parameter to a valid value.
WARNING/ALARM 22, Hoist mechanical brake
The value of this warning/alarm shows the type of
warning/alarm.
0 = The torque reference was not reached before timeout
(
parameter 2-27 Torque Ramp Up Time ).
1 = Expected brake feedback not received before timeout
(
parameter 2-23 Activate Brake Delay , parameter 2-25 Brake
Release Time ).
WARNING 23, Internal fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in
parameter 14-53 Fan Monitor ( [0]
Disabled ).
For frequency converters with DC fans, there is a feedback
sensor mounted in the fan. If the fan is commanded to run
and there is no feedback from the sensor, this alarm
appears. For frequency converters with AC fans, the
voltage to the fan is monitored.
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
•
Check the sensors on the heat sink and control
card.
WARNING 24, External fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in
parameter 14-53 Fan Monitor ( [0]
Disabled ).
Maintenance, Diagnostics, a...
VLT
®
AutomationDrive FC 301/302
42 Danfoss A/S © 07/2015 All rights reserved. MG33AQ02
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