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9.3.17 ALARM 16, Short Circuit
Cause
There is short-circuiting in the motor or motor wiring.
Troubleshooting
W A R N I N G
HIGH VOLTAGE
AC drives contain high voltage when connected to AC mains input, DC supply, or load sharing. Failure to perform installation,
start-up, and maintenance by qualified personnel can result in death or serious injury.
Only qualified personnel must perform installation, start-up, and maintenance.
Disconnect power before proceeding.
Remove the power to the drive and repair the short circuit.
9.3.18 WARNING/ALARM 17, Control Word Timeout
Cause
There is no communication to the drive. 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 drive ramps down to a stop and
shows an alarm.
Troubleshooting
Check the connections on the serial communication cable.
Increase
parameter 8-03 Control Word Timeout Time
.
Check the operation of the communication equipment.
Verify that proper EMC installation was performed.
9.3.19 WARNING/ALARM 20, Temp. Input Error
Cause
The temperature sensor is not connected.
9.3.20 WARNING/ALARM 21, Parameter Error
Cause
The parameter is out of range. The parameter number is shown in the display.
Troubleshooting
Set the affected parameter to a valid value.
9.3.21 WARNING 23, Internal Fan Fault
Cause
The fan warning function is a 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 drives with DC fans, a feedback sensor is mounted in the fan. If the fan is commanded to run and there is no feedback from the
sensor, this alarm appears. For drives with AC fans, the voltage to the fan is monitored.
Troubleshooting
Check for proper fan operation.
Cycle power to the drive and check that the fan operates briefly at start-up.
Check the sensors on the control card.
9.3.22 WARNING 24, External Fan Fault
Cause
The fan warning function is a 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 drives with DC fans, a feedback sensor is mounted in the fan. If the fan is commanded to run and there is no feedback from the
sensor, this warning appears. For drives with AC fans, the voltage to the fan is monitored.
AQ357954340588en-000201 / 130R0881
126 | Danfoss A/S © 2020.09
Maintenance, Diagnostics, and
Troubleshooting
VLT® Refrigeration Drive FC 103
Operating Guide
Summary of Contents for VLT FC 103
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