02.05
8 Status indicators and troubleshooting
© Siemens AG 1998 All Rights Reserved
FM-STEPDRIVE/SIMOSTEP (FB)
8-3
Malfunction Cause
Rectification
None of the LEDs
light
Mains voltage not
available
Check mains voltage
and mains connection
wiring.
Motor does not
rotate and does not
have a holding
torque
PWM signal input active
Set PWM input to
inactive.
Motor line(s) interrupted
With the mains voltage
disconnected, check the
motor wiring.
Motor does not
rotate but does
have a holding
torque
No clock signal present
on PULSE input
Supply clock signal to
PULSE input.
Motor turns in
incorrect direction
Motor phases
interchanged
Connect the motor
phases properly.
DIR signal input set
incorrectly
Invert signal on DIR
input.
Motor torque is too
low (motor slips)
Motor phase current set
too low
Set phase current
correctly.
Acceleration ramp too
steep
Reduce acceleration
ramp on control unit.
The drive is
mechanically blocked
Eliminate mechanical
blocking.
Other malfunctions
which are not
indicated
Connected motor's rating
is insufficient
Connect a more powerful
motor.
!
Caution
Before replacing the power controller, check motor and wiring for a
ground fault!
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