Lenze MDxMA-MHxMA-MFxMA-MDERA-MHERA Three-phase AC motors - Manual (Page 58)

Troubleshooting and fault elimination 9
l
58 BA 33.0005−EN 2.0
Remedy Cause Fault
Incorrect direction of
rotation of the motor,
correct display on the
controller
Motor cable polarity is reversed Check and correct polarity
Encoder cable polarity is reversed
Motor rotates normally
but does not generates the
expected torque Motor cable interchanged cyclically Connect the phases at the motor cable connection correctly
Motor rotates in one
direction at maximum
speed in an uncontrolled
manner Motor cable interchanged cyclically Check motor connection and, if necessary, correct it
Polarity of encoder cable reversed Check encoder connection and, if necessary, correct it
Motor rotates slowly in
one direction and cannot
be influenced by the drive
controller Polarity of motor cable and encoder
cable reversed Check the polarity and correct it
Unsteady running Shielding of motor cable or resolve
cable inadequate Check shielding and earth connection
Gain of the drive controller too high Adapt gain of the controller (see operating instructions for
drive controller)
Vibrations Insufficiently balancing of coupling
elements or machine Rebalance
Inadequate alignment of drive train Realign machine, if necessary, check foundation
Loose fixing screws Check screwed connections and tighten them if necessary
Running noises Foreign particles inside the motor Repair by manufacturer if necessary
Bearing damage
Surface
temperature > 140°C Overload of the drive l Check overload and reduce through longer acceleration
times, if necessary
l Check winding temperature
Heat dissipation impeded by dirt
deposits Clean surface and cooling ribs of the drives