Lenze MDFQA Operating Instructions - Manual (Page 46)

Troubleshooting and fault elimination 10
EN
46 Lenze ¯ BA 33.0006 ¯ 3.0
Fault Cause Remedy
Motor too hot
Can only be evaluated by
measuring the surface
temperature:
¯
Non−ventilated motors
> 140 °C
¯ Externally ventilated or
self−ventilated motors
> 110 °C
Insufficient cooling air, blocked air
ducts. Ensure unimpeded circulation of cooling air
Preheated cooling air Ensure a sufficient supply of fresh cooling air
Overload, with normal mains voltage
the current is too high and the speed
too low Use larger drive (determined by power measurement)
Rated operating mode exceeded (S1 to
S8 IEC/EN 60034−1) Adjust rated operating mode to the specified operating conditions.
Determination of correct drive by expert or Lenze customer service
Loose contact in supply cable
(temporary single−phase operation!) Tighten loose contact
Fuse has blown (single−phasing!) Replace fuse
Overload of the drive ¯ Check load and, if necessary, reduce by means of longer
ramp−up times
¯ Check winding temperature
Heat dissipation impeded by deposits Clean surface and cooling fins of the drives
Motor too hot
Can only be evaluated by
measuring the surface
temperature:
¯
Non−ventilated motors
> 140 °C
¯ Externally ventilated or
self−ventilated motors
> 110 °C
Insufficient cooling air, blocked air
ducts. Ensure unimpeded circulation of cooling air
Preheated cooling air Ensure a sufficient supply of fresh cooling air
Overload, with normal mains voltage
the current is too high and the speed
too low Use larger drive (determined by power measurement)
Rated operating mode exceeded (S1 to
S8 IEC/EN 60034−1) Adjust rated operating mode to the specified operating conditions.
Determination of correct drive by expert or Lenze customer service
Loose contact in supply cable
(temporary single−phase operation!) Tighten loose contact
Fuse has blown (single−phasing!) Replace fuse
Overload of the drive ¯ Check load and, if necessary, reduce by means of longer
ramp−up times
¯ Check winding temperature
Heat dissipation impeded by deposits Clean surface and cooling fins of the drives
Motor suddenly stops and
does not restart Overload monitoring of the inverter is
activated ¯ Check controller settings
¯ Reduce load caused by longer acceleration times
Incorrect direction of
rotation of the motor,
correct display on the
controller Motor cable polarity is reversed Check the polarity and correct
Polarity of encoder cable reversed
Motor rotates normally but
does not reach the expected
torque Motor cable interchanged cyclically Connect the phases at the motor cable connection correctly
Motor turns in one direction
at maximum speed in an
uncontrolled manner Motor cable interchanged cyclically Check motor connector and, if necessary, correct
Polarity of encoder cable reversed Check encoder connection and, if necessary, correct
Motor rotates slowly in one
direction and cannot be
influenced by the controller Polarity of motor cable and encoder
cable reversed Check the polarity and correct
Irregular running Insufficient shielding of motor or
resolver cable Checking shielding and earth connection
Drive controller gain too large Adjust the gains of the controllers (see Drive controller operating
instructions)
Vibrations Insufficiently balanced coupling
elements or machine Rebalance
Inadequate alignment of drive train Realign machine unit, check foundation if necessary
Loose fixing screws Check and tighten screw connections
Running noises Foreign particles inside the motor Repair by manufacturer if necessary
Bearing damage
Surface temperature > 140°C Overload of the drive ¯ Check load and, if necessary, reduce by means of longer
ramp−up times
¯ Check winding temperature
Heat dissipation impeded by deposits Clean surface and cooling fins of the drives