Pilz PMCtendo SZ.41/0/1/2/7/K/H/60/00 - Manual (Page 35)

Operating Manual PMCtendo SZ 
1002405-EN-03
35
7 Commissioning
Fault Possible cause of fault Measure
Motor shaft not 
rotating
Servo amplifier not enabled • Connect enable signal for the servo
amplifier
Reference value cable interrupted • Check reference value cable
Motor phases incorrectly connected (rota-
ry field incorrect) • Connect motor phases correctly
Motor brake not released • Check brake controller
• Check voltage supply to the motor
brake
Drive is blocked mechanically • Check mechanical parts
Torque too low • Check current limit in the servo ampli-
fier
• Install stronger motor or servo amplifi-
er
Motor shaft rotates 
uncontrolled (positive
feedback)
Wrong feedback offset • Check feedback offset and correct, if
necessary
Motor phases incorrectly connected (re-
versed cycle, rotary field correct) • Reverse direction of rotation in servo
amplifier
• Connect motor phases correctly
Motor oscillates Screen of feedback cable interrupted • Reconnect screen of feedback cable
interrupted
• Replace cable, if necessary
Control parameters incorrect • Correct control parameters in servo
amplifier
Output stage fault 
signalled (at servo
amplifier)
Motor cable has short-circuit or earth fault • Replace cable
Motor has short-circuit or earth fault • Replace motor
Feedback fault 
signalled (at servo
amplifier)
Feedback plug is not correctly connected • Check plug connectors
Feedback cable is interrupted, pinched,
etc. • Inspect cable
Motor temperature
fault signalled (at ser-
vo amplifier) Connection to motor thermal protection in-
terrupted • Check plug connectors
• Check leads
Motor thermal protection has tripped • Check thermal situation at installation
location
• Use external fan, if necessary
Motor brake does not
engage Demanded holding torque too high • Check dimensioning of the motor
brake
Motor brake defective • Replace motor
Motor shaft with axial overload • Check axial load and reduce, if neces-
sary; also replace motor because the
bearings are damaged