BECKHOFF AM2000 - Manual (Page 33)

IV.2 Fault-finding
The following table is to be seen as a “First Aid” box. There can be a large number of dif-
ferent reasons for a fault, depending on the particular conditions in your system. The fault
causes described below are mostly those which directly influence the motor. Peculiarities
which show up in the control loop behaviour can usually be traced back to an error in the
parameterization of the servoamplifier. The documentation for the servoamplifier and the
operator software provides information on these matters.
For multi-axis systems there may be further hidden reasons for faults.
Our applications department can give you further help with your problems.
Fault Possible cause
Measures to remove the cause of
the fault
Motor doesn’t
rotate
— servoamplifier not enabled
— Break in setpoint lead
— Motor phases in wrong sequence
— Brake not released
— Drive is mechanically blocked
— Supply ENABLE signal
— Check setpoint lead
— Correct the phase sequence
— Check brake controls
— Check mechanism
Motor runs away — Motor phases in wrong sequence — Correct the phase sequence
Motor oscillates
— Break in the shielding of the resolver cable
— amplifier gain to high
— Replace resolver cable
— use motor default values
Error message:
brake
— Short-circuit in the supply voltage lead to
the motor holding brake
— Faulty motor holding brake
— Remove the short-circuit
— Replace motor
Error message:
output stage fault — Motor cable has short-circuit or earth short
— Motor has short-circuit or earth short — Replace cable
— Replace motor
Error message:
resolver
— Resolver connector is not properly plugged in
— Break in resolver cable, cable crushed or
similar
— Check connector
— Check cables
Error message:
motor temperature
— Motor thermostat has switched
— Loose resolver connector or break in
resolver cable
— Wait until the motor has cooled
down. Then investigate why the
motor becomes so hot.
— Check connector, replace resolver
cable if necessary
Brake does not
grip
— Required holding torque too high
— Brake faulty
— Motor shaft axially overloaded
— Check the dimensioning
— Replace motor
— Check the axial load, reduce it.
Replace motor, since the bearings
have been damaged
Motor series AM227..297 33
BECKHOFF
12/2001
Appendix