Excess Temperature Of Motor Housing; High Motor Temperature Values, But Housing Temperature Is Normal - Bosch Rexroth IndraDyn A Series Project Planning Manual

Rexroth IndraDyn A

Excess Temperature of Motor Housing

Possible causes
Measures

High Motor Temperature Values, but Housing Temperature is Normal

Possible causes
Measures
DOK-MOTOR*-MAD/MAF****-PR03-EN-P
The housing temperature of the motor climbs to unusually high values.
Status
CAUTION
1. Loss or malfunction in the fan or cooling system.
2. Original operating cycle has been changed.
3. Original motor parameters have been changed.
4. Motor bearings worn or defective.
1. With MAD,
In the case of a malfunction, contact Bosch Rexroth Service.
With MAF, check the cooling 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. Danger 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.
The diagnostics system of the drive controller shows unusually high
Status
values for the winding temperature via the display or control software.
However, the motor housing has a normal temperature.
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.
• Set the measuring instrument to resistance measurement.
• Shut down the system and wait for the discharging time to elapse.
Separate the temperature sensor connection from the drive device
and connect the wire pair with the measuring instrument (this
includes the sensor cable in the test). Check values according to
the characteristic curve in Fig. 9-18.
Operating IndraDyn A Motors
Damage of motor or machine by restarting after
increased motor temperature!
⇒ Liquid-cooled motors should not be restarted or
supplied with cold coolant immediately after failure of
the coolant system and an increased motor
temperature. Danger of damage!
⇒ Wait until the motor temperature has dropped to
approx. 40° C before restarting.
check fan function.
12-7
Clean if necessary.