Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 123)

Troubleshooting 9-5
Table 9.D – Motor Stops While Running
Display Possible Causes Possible Solutions
Fault displayed • See fault description • See Table 9.A addressing fault conditions
Display is blank • Control voltage is absent
• Failed control module • Check control wiring and correct if necessary
• Replace control module
Stopped
0.0 Amps • Pilot devices
• Failed control module • Check control wiring and correct if necessary
• Replace control module
Starting • Two or three power phases are
missing
• Failed control module
• Check power system
• Check voltage sensing module and connections
• Replace control module
Table 9.E – Miscellaneous Situations
Display Possible Causes Possible Solutions
Motor current and
voltage fluctuates with
steady load • Motor
• Erratic Load
• Verity type of motor as a standard squirrel cage induction
motor
• Check load conditions
Erratic operation • Loose connections • Shut off all power to controller and check for loose
connections
Accelerates too fast • Starting time
• Initial torque
• Current limit setting
• Kickstart • Increase starting time
• Lower initial torque setting
• Decrease current limit setting
• Lower kickstart time or turn off
Accelerates too slow • Starting time
• Initial torque
• Current limit setting
• Kickstart • Decrease starting time
• Increase initial torque setting
• Increase current limit setting
• Increase kickstart time or turn off
Fan does not operate • Wiring
• Failed fans(s) • Check wiring and correct if necessary
• Replace fan(s)
Motor stops too quickly
with Soft Stop option • Time setting • Verify the programmed stopping time and correct if
necessary
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 • Overload
• Blocked ventilation
• Duty cycle • Allow motor to cool and reduce load.
• Remove blockage and ensure motor is being adequately
cooled.
• 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
NOTE: For Pump Stop issues, please refer to “Pump Application Considerations” on page 1-20.