10
Service
Troubleshooting
Operating Instructions – Compact Extra-Low Voltage Drives
72
10.2
Troubleshooting
This chapter describes possible error messages/malfunctions, causes and remedies.
10.2.1
Error handling
State
Cause of error
Error details
Measure
Motor does not respond,
not ready
U
DC48V
Overvoltage
Adjust
Undervoltage
Adjust
U
DC24V
Supply with DC 24 V
Acknowledgment missing
Acknowledge
Incorrect parameter
Correct
Motor regulates to 0, set-
point speed cannot be
specified
Setpoint missing
Specify setpoint
Incorrect setpoint select-
ed
Rectify
Incorrect parameter
Correct
Motor judders
Control parameter is un-
suitable
Speed controller
Adjust
Position controller
Adjust
K_FF unsuitable
Adjust
U
DC48V
fluctuates
Stabilize
Motor judders when
switching to position hold
control
K_FF = 0
Set K_FF
Motor does not position
itself
Enable missing
IN A/IN B must be set to
1/1
KP_H missing
Adjust
Maximum positioning
speed = 0
Adjust
No distance set
Set or teach mode
Dynamics too weak
Motor overloaded
Configure motor
Ramp too flat
Set steeper
Current limiting
Open current limiting
Motor coasts to a halt
when braking
Overvoltage
No braking resistor
Use a feedback protected
power supply unit
Use braking resistor
10.3
Failures of the mechanical drive
The following table shows fault diagnostics options for failures of the mechanical drive:
Failure
Possible cause
Measure
Unusual, regular running noise
Meshing/grinding noise: Bearing
damage
Contact SEW‑EURODRIVE
Service
26718014/EN – 11/2020
