Excessive Temperature Of Motor Housing; High Motor Temperature Values, But Housing Temperature Is Normal - Bosch Rexroth MAD Project Planning Manual

MAD / MAF Asynchronous Housing Motors
12.6.2

Excessive temperature of motor housing

Possible causes
Measures for
12.6.3

High motor temperature values, but housing temperature is normal

Possible causes
Measures for
State The housing temperature of the motor rises to unusually high values.
NOTICE
● Liquid-cooled motors may not be restarted or supplied with cold coolant
immediately after a failure of the cooling system and an increased motor
temperature. Risk of damage!
● Before restarting the motor, wait until the motor temperature has drop‐
ped to approx. 40 °C.
1. Failure or fault in the fan or cooling system.
2. The original machining cycle has been changed.
3. The original motor parameters have been changed.
4. Motor bearings are worn or defective.
1. Check the fan of MAD motors for proper functioning. Clean as required.
Contact Bosch Rexroth Service in case of a failure.
Check the cooling system of MAF motors for proper functioning. Clean
or rinse the cooling circuit as required. Contact the machine manufactur‐
er in the case of a cooling system failure.
2. Check the sizing of the drive for changed requirements. Stop operation
in case of overload. Risk of damage!
3. Restore the original parameters. Check the sizing of the drive if require‐
ments have been changed.
4. Contact the machine manufacturer.
State The diagnostic system of the controller shows unusually high winding temper‐
ature values via display or operator software. However, the temperature of
the motor housing is normal.
1. Wiring error or cable break in sensor cable.
2. Diagnostic system defective.
3. Check the wiring and connection of the temperature sensor according to
the interconnection diagram.
4. Failure of the winding temperature sensor (PTC).
1. Check the diagnostic system at the controller or the control unit.
2. Check the resistance value of the temperature sensor using a multime‐
ter.
● Set the measuring device to resistance measurement mode.
● Shut down the system and wait until the discharging time has
elapsed. Disconnect the temperature sensor from the controller
and connect the wire pair to the measuring device (this also checks
the sensor line). Check the values according to
istic of temperature measurement sensor KTY84-130 (PTC)" on
page 204.
Operation of MAD/MAF motors
Damage to motor or machine by restarting af‐
ter excessive motor temperature!
R911295781_Edition 11 Bosch Rexroth AG
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fig. 9-8 "Character‐