8.4.20 WARNING/ALARM 22, Hoist Mechanical Brake
Cause
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 was not received before timeout (parameter 2-23 Activate Brake Delay, parameter 2-25 Brake Release Time).
8.4.21 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.
8.4.22 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.
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 heat sink.
8.4.23 WARNING 25, Brake Resistor Short Circuit
Cause
The brake resistor is monitored during operation. If a short circuit occurs, the brake function is disabled and the warning appears. The
drive is still operational, but without the brake function.
Troubleshooting
• Remove the power to the drive and replace the brake resistor (refer to parameter 2-15 Brake Check).
Maintenance, Diagnostics, and
Troubleshooting
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707
106 | Danfoss A/S © 2020.01
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