Bosch rexroth MBT, Manual

Page: 409 / 422

considerably, an inter-phase short circuit, an interturn fault or a short circuit
occurred.
In case of considerable deviations in resistance, please contact
the Bosch Rexroth customer service.
Insulation resistance The insulation resistance - measured between the motor connection wires
and ground - should be at least 1 MΩ (MegaOhm).
If the resistance too low, please contact the Bosch Rexroth cus‐
tomer service.
13.13 Troubleshooting
13.13.1 General information
Risk of injury due to moving elements! Risk of
injury due to hot surfaces!
DANGER
⇒ Do not carry out any maintenance work while the machine is running
⇒ Switch off the controller and the machine and wait until the discharging
time of the electrical systems has elapsed before starting troubleshooting
⇒ Secure the machine against start-up and unauthorized operation during
maintenance work
⇒ Do not work on hot surfaces
The rotor is magnetic! Risk of injury and dan‐
ger of crushing body parts by magnetic
forces!
WARNING
⇒ Remove or secure any movable metal objects.
⇒ Handle all magnetic components with care.
⇒ Wear protecting clothes and use installation aids
Possible causes for failures of motors can be restricted to the following areas:
●
Motor cooling circuit and temperature curve
● Internal temperature sensor
● Mechanical damage of the motor
● Mechanical connection to machine
Encoder and temperature sensor are controlled by the controller or the con‐
trol unit; corresponding diagnostic messages are displayed. Comply with the
instructions in the corresponding documentation.
The sections below describe examples of some fault states along with possi‐
ble causes. This list is not exhaustive.
MBT High Synchronous Torque Motors 397/409
Commissioning, operation and maintenance
R911298798_Edition 08 Bosch Rexroth AG