SCHUNK STM 560V Series, Assembly And Operating Manual

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Troubleshooting
60 04/STM-560V/en/2010-12-10/SW
10 Troubleshooting
10.1 SCHUNK torque motor STM
10.1.1 STM is not turning
Possible cause Corrective action
Interruption in the supply lines
 Check the supply lines for defects
 Check the electrical connections
(see chapter 7.2, page 29)
No motion release
 Check the converter settings
(see manual pertaining to the converter)
Converter is defective
 Check whether there is voltage at the converter's output. If
there is no voltage:
a) Check the connection pin assignment
(see chapter 7.2, page 29)
b) see manual pertaining to the converter
Target value line or communication
between master and controller is
interrupted

Check the target value line and communication.
Rotor is blocked mechanically
 Check the mechanical components.
 Check the evenness at the mounting surface (see chapter
7.1, page 26)
Shaft encoder defective

Check shaft encoder and its connection. If a defect is
detected, the STM must be sent to SCHUNK with a repair
order.
Short-circuit between turns in the
motor
 Check the difference of the winding resistance values. Do
not exceed the difference.
 If the difference between the individual motor phases
exceeds 0.1 Ohm, the STM must be sent to SCHUNK with
a repair order.
Short-circuit to ground due to moisture
short-circuit to ground due to electrical
defect
 Check the protective conductor.
 Check the electrical connection and connectors for ground
leakage.
 If the STM has a ground leak while the power cable is
disconnected, the STM must be sent to SCHUNK with a
repair order.
Incorrect phase connections
 Check the electrical connections
(see chapter 7.2, page 29)
Incorrect controller settings
 Check the parameters and setting values
(see operating manual for the controller)