User manual

115
Version 2.4 (10/2011) en
Original instructions
Drum Motor
Troubleshooting
Rotor pinion worn or broken teeth Excessive frequent stops/starts,
excessive start torque
Check if application meets Drum Motor's
specifications.
Check oil, maximum stops/starts and
starting torque allowed.
Geared rim worn or broken teeth /
bolts
Starting under excessive load and /
or shock loading or blockage
Check if application and loading meets
Drum Motor's specifications.
Check for blockage.
Intermediate gears and bearings
worn / failed
Lack of lubrication or worn gears or
bearings
Check oil level.
Check journal bearing fitting and pinion /
shaft tolerances and lifespan.
Total or intermittent failure of brake
and rectifier
Incorrect operating voltage
connected
Make sure that the correct rectifier has
been installed and the input voltage (V/
Ph/Hz) is correct.
Incorrect connection Make sure that the brake has been
connected according to the connection
diagram.
Insufficient screening from external
AC spikes from cables and external
devices
Make sure that all cables between the
brake, rectifier and supply are screened
and earthed according to IEC
recommendations.
Total or intermittent failure of brake
and rectifier
Voltage drop due to excessive cable
length
Check for voltage drop over long cables
and make sure the cable cross section
is sufficient according to IEC
regulations.
Excessive stops/starts Make sure brake and rectifier
specifications meet the application's
requirements.
Wrong rectifier connected Contact Interroll for information on
correct rectifier for brake and
application.
Overrun voltage generation / back
feed when the rectifier is connected
to motor star point
Decline conveyors may produce motor
overrun and generate high voltage back
feed if motor star point voltage is used.
Brake windings short circuit Check continuity of winding and
rectifier.
Slow brake and rectifier response Incorrect brake / rectifier chosen or
specified
Make sure the brake and rectifier
specifications meet the application's
requirements.
Low ambient temperature or oil
viscosity too high
Make sure oil viscosity is suitable for the
ambient temperature. If not, replace with
oil having the correct specification.
Install heating device or higher powered
motor. In this case, contact your local
Interroll distributor for further help and
advice.
Symptom Possible cause Help