Rockwell Automation SMC-Flex, User Manual, Page: 124 / 160

9-6 Troubleshooting
Motor stops too
slowly with
Soft Stop option • Stopping time
setting
• Misapplication
• Verify the programmed stopping
time and correct if necessary
• The Soft Stop option is intended to
extend the stopping time for loads
that stop suddenly when power is
removed from the motor.
Fluid surges with
pumps still occur
with the Soft Stop
option • Misapplication • Soft Stop ramps voltage down over
a set period of time. In the case of
pumps, the voltage may drop too
rapidly to prevent surges. A closed
loop system such as Pump Control
would be more appropriately
suited.
• Refer to Publication 150-911
Motor overheats • Duty cycle • Preset Slow Speed and Accu-Stop
options: Extended operation at slow
speeds reduces motor cooling
efficiency. Consult motor
manufacturer for motor limitations.
• Smart Motor Braking option:
Check duty cycle. Consult motor
manufacturer for motor limitations.
Motor short circuit • Winding fault • Identify fault and correct.
• Check for shorted SCR; replace if
necessary.
• Ensure power terminals are secure.