Troubleshooting

Read and understand the following precautions before performing any maintenance.

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462 or local equivalent. Only qualified personnel familiar with medium voltage equipment are to perform work described in this set of instructions. Workers must understand the hazards involved in working with or near medium voltage circuits. Perform such work only after reading and understanding all of the instructions contained in this bulletin. Turn off all power supplying this equipment before working on or inside the equipment. Always use a properly rated voltage sensing device to confirm power is off. Before performing visual inspections, tests, or maintenance on the equipment, disconnect all sources of electric power. Assume that all circuits are live until they have been completely de-energized, tested, grounded, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding. More than one disconnector switch may be required to de-energize the equipment before servicing. Disconnect the equipment and enable a lockout command prior to performing maintenance on the equipment. Ensure that any stored energy in the capacitors has dissipated before energizing or de-energizing the equipment. Disconnect the controller from the load before measuring insulation resistance (IR). Carefully inspect your work area and remove any tools and objects left inside the equipment. Replace all devices, doors, and covers before turning on power to  this equipment. All instructions in this manual are written with the assumption that the customer has taken these measures before performing installation, maintenance  or testing. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462 or local equivalent.
Only qualified personnel familiar with medium voltage equipment are to perform work described in this set of instructions. Workers must understand the hazards involved in working with or near medium voltage circuits.
Perform such work only after reading and understanding all of the instructions contained in this bulletin.
Turn off all power supplying this equipment before working on or inside the equipment.
Always use a properly rated voltage sensing device to confirm power is off.
Before performing visual inspections, tests, or maintenance on the equipment, disconnect all sources of electric power. Assume that all circuits are live until they have been completely de-energized, tested, grounded, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding. More than one disconnector switch may be required to de-energize the equipment before servicing.
Disconnect the equipment and enable a lockout command prior to performing maintenance on the equipment.
Ensure that any stored energy in the capacitors has dissipated before energizing or de-energizing the equipment.
Disconnect the controller from the load before measuring insulation resistance (IR).
Carefully inspect your work area and remove any tools and objects left inside the equipment.
Replace all devices, doors, and covers before turning on power to  this equipment.
All instructions in this manual are written with the assumption that the customer has taken these measures before performing installation, maintenance  or testing.

Failure to follow these instructions will result in death or serious injury.

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
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.
	Mechanical problems	Check the motor.
	Line voltage is too low	Verify that the line voltage is sufficient and does not drop too low when starting the motor.
	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.
Motor current or voltage fluctuates with steady load	Power connection	Shut off all power and check the connections.
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.
	Acceleration time too long	Reduce motor load
	Incorrect overload protection settings.	Check and correct overload protection settings, if necessary.
Motor short circuit	Wiring event	Identify and correct the wiring issue.
Motor short circuit	Power factor correction capacitors (PFCC) on starter output	Move PFCC to line side of starter.

NOTE: Additional troubleshooting information can be found in instruction bulletin BRU3897001 for ATL configurations using the MotorSeT advanced motor control system.