Danfoss VLT AutomationDrive FC 360 Programming Manual page 327

Programming Guide | VLT® AutomationDrive FC 360
WARNING 89, HOIST BRAKE SLIDING
Cause
This warning occurs when the motor speed feedback is bigger than 10 RPM during torque building time before the brake is open
(parameter 2-27 Torque Ramp Up Time).
Troubleshooting
Check if the mechanical brake is broken or opened before start.
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Check that the feedback is not zero before opening the brake.
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WARNING/ALARM 90, Feedback Monitor
Cause
A feedback fault is detected by option B.
WARNING/ALARM 95, Broken Belt
Cause
Torque is below the torque level set for no load, indicating a broken belt. Parameter 22-60 Broken Belt Function is set for alarm.
Troubleshooting
Troubleshoot the system and reset the drive after clearing the fault.
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ALARM 99, Locked Rotor
Cause
The rotor is blocked. It is only enabled for PM motor control.
Troubleshooting
Check if the motor shaft is locked.
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Check if the start current triggers the current limit set in parameter 4-18 Current Limit.
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Check if it increases the value in parameter 30-23 Locked Rotor Detection Time [s].
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WARNING/ALARM 102, Speed Monitor
Cause
A speed fault is detected when the motor overspeeds. This is only available in flux control mode.
Troubleshooting
This function can be enabled/disabled in parameter 4-43 Speed Monitor Function.
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ALARM 120, Position Control Fault
Cause
When this alarm occurs, the reason is shown in parameter 37-18 Pos. Ctrl Fault Reason.
Troubleshooting
Refer to the option descriptions in parameter 37-18 Pos. Ctrl Fault Reason.
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