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Bosch Rexroth AG | Electric Drives
Operating Torque Motors
12.12.2
Excess Temperature of Motor Housing
CAUTION
Possible Causes
Measures
12.12.3
High Motor Temperature Values, but Housing Temperature is Normal
Possible Causes
Measures
12.12.4
Motor or Machine generates Vibrations
and Controls
Some sample faults are in the following, along with potential causes. This list
does not lay claim to completeness.
Status
The housing temperature of the motor rises to unusually high values.
Damage to motor or machine by restarting after excessive motor tem‐
perature!
⇒ Liquid-cooled motors should not be restarted or supplied with cold coolant
immediately after failure of the coolant system and an increased motor tem‐
perature. Risk of damage!
⇒ Wait until the motor temperature has dropped under +40°C C before restart‐
ing.
1.
Malfunction in the coolant system.
2.
The original operating cycle has been changed.
3.
The original motor parameters have been changed.
4.
Motor bearings worn or defective.
1.
Check the coolant system Clean or rinse the cooling circuit if required.
Contact the machine manufacturer if the coolant system malfunctions.
2.
Check the layout of the drive for changed requirements. If overloading
occurs, stop operation. Risk of damage!
3.
Reset to the original parameters. Check the layout of the drive in the case
of changed requirements.
4.
Contact the machine manufacturer.
Status
The diagnostics system of the machine indicates unusually high values for the
winding temperature via the display or control software. However, the temper‐
ature of the motor housing is normal.
1.
Wiring error or cable break in sensor cable.
2.
Diagnostics system defective.
3.
Winding temperature sensor malfunction (PTC).
1.
Check the wiring and connection of the temperature sensor according to
the terminal diagram.
2.
Check the diagnostics system on the drive device or the control unit.
3.
Check the resistance value of the temperature sensor using a multimeter.
●
Shut down the system and wait for the discharging time to elapse.
●
Disconnect the connection of the temperature sensor on the control-
device. Set the measuring instrument on resistor measuring and
connect the strand pair with the measuring instrument (therewith, the
sensor cable is also checked). Check values according to the char‐
acteristic curves in
page
206.
Status
Audible or tactile vibrations occur on the motor or on the machine.
Rexroth IndraDyn T | Project Planning Manual
chapter 9.6 "Motor Temperature Monitoring" on
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