Troubleshooting
05/STM-48V/en/2011-04-01/CW
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13
Troubleshooting
13.1
SCHUNK Torque Motor STM
13.1.1
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 30)
No motion release
Check the controller settings (see operating manual for the
controller; for the MCS-12, see MotionControl.pdf on the DVD)
Controller defective
Check whether there is voltage at the controller's output. If there is
no voltage:
a) Check the connection pin assignment (see chapter 7.2,
page 30)
b) Consult the operating manual for the controller
Target value line or communi-
cation 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
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 30)
Incorrect controller settings
Check the parameters and setting values
(see operating manual for the controller)
Motor phases or encoder sig-
nals confused
Check the electrical connections (see chapter 7.2, page 30)
Check the encoder signals and the shielding of the encoder cable.
Table 33
