Danfoss VLT HVAC Drive FC 102 Operating Manual page 136

Operating Guide | VLT® HVAC Drive FC 102
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/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).
9.3.22 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.
136 | Danfoss A/S © 2018.10
Maintenance, Diagnostics, and
Troubleshooting
AQ262141314214en-000101 / 130R0880