Danfoss VLT HVAC Drive FC 131 Programming Manual page 188

VLT® HVAC Drive FC 131
Programming Guide
5.5.39 WARNING/ALARM 95, Broken Belt
Cause
Torque is below the torque level set for no load, indicating a broken belt. See parameter group 22-6* Broken Belt Detection.
Troubleshooting
• Troubleshoot the system.
• Reset the drive after the fault is cleared.
5.5.40 ALARM 99, Locked Rotor
Cause
The rotor is blocked.
For 18–30 kW: If the protection is triggered more than 10 repeated times, auto reset transitions to require a manual operation to
clear the alarm.
Troubleshooting
• Ensure that the rotor can operate freely.
•
Check the settings in parameter group 1-1* Motor Selection.
•
Check the settings in parameter group 1-2* Motor Data.
5.5.41 ALARM 101, Flow/pressure Info Missing
Cause
Sensorless-pump table is missing or wrong.
Troubleshooting
• Download sensorless-pump table again.
5.5.42 ALARM 126, Motor Rotating
Cause
High back-EMF voltage.
Troubleshooting
• Stop the rotor of the PM motor.
5.5.43 WARNING 127, Back EMF Too High
Cause
This warning applies to PM motors only. When the back-EMF exceeds 90% x U
normal level within 5 s, this warning is reported. The warning remains until the back EMF returns to a normal level.
Troubleshooting
• Check the settings in parameter group 1-2* Motor Data.
5.5.44 WARNING 159, Check Valve Failure
When the drive is not in operation, a broken check valve leads to the motor runs in reverse.
Troubleshooting
• Troubleshoot the system.
• Reset the drive when the fault is cleared.
5.5.45 WARNING 200, Fire Mode
Cause
Fire mode has been activated.
Troubleshooting
• The warning clears when fire mode is removed.
• See the fire mode data in the alarm log.
188 | Danfoss A/S © 2022.05
(overvoltage threshold) and does not drop to
invmax
AU370727746889en-000101 / 130R0994
Troubleshooting