Troubleshooting
Read and understand the following precautions before performing any maintenance.
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HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Failure to follow these instructions will result in death or serious injury.
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Use the troubleshooting information in the following tables to help determine and solve issues:
Motor Does Not Start, No Output to Load
Problem |
Cause |
Action |
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No start signal to motor |
Control devices |
Check the control devices and wiring. |
No power to line |
At least one phase of mains power is missing. |
Check the power system. |
Motor Rotates but Does Not Reach Full Speed
Problem |
Cause |
Action |
---|---|---|
Motor will not start |
Mechanical problems |
Check for stalled load. |
Check the motor. |
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Line voltage is too low |
Verify that the line voltage is sufficient and does not drop too low when starting the motor. |
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Current to motor is too low |
Check electronic protection relay settings. |
Motor Stops Unexpectedly While Running
Problem |
Cause |
Action |
---|---|---|
Motor stopped |
Motor received stop signal |
Check the control system. Check for loose connections. |
Other Issues
Problem |
Cause |
Action |
---|---|---|
Power metering not working |
Current Transformer (CT) installed incorrectly |
Install the CTs with the white polarity dot to the line/input side. Verify that the CT is on the correct phase. |
Motor current or voltage fluctuates with steady load |
Motor event |
Verify that the motor is operating correctly. |
Power connection |
Shut off all power and check the connections. |
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Erratic operation |
Loose connections |
Shut off all power and check all connections. |
Motor overheats |
Duty cycle |
Allow the motor to cool between starts. |
High ambient temperature |
Reduce the ambient temperature or provide better cooling. |
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Acceleration time too long |
Reduce motor load |
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Incorrect overload protection settings. |
Check and correct overload protection settings, if necessary. |
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Motor short circuit |
Wiring event |
Identify and correct the wiring issue. |
Power factor correction capacitors (PFCC) on starter output |
Move PFCC to line side of starter. |