Troubleshooting - ABB M2B Serie Manual De Instalación, Manejo Y Mantenimiento

5. Troubleshooting

Warning
1. Disconnect power before working on motor or
driven equipment. It is necessary to make sure
that the rotor of the motor can neither be
energized electrically nor start to rotate by any
other means. Apply this also for the driven
equipment.
2. Motors with automatic thermal protectors will
automatically restart when the protector
temperature drops suffi ciently. Do not use motors
with automatic thermal protectors in applications
where automatic restart will be hazardous to
personnel or equipment.
3. Motors with manual thermal protectors may start
unexpectedly after protector trips. If manual
protector trips, disconnect motor from power line.
After protector cools (fi ve minutes or more) it can
be reset and power may be applied to motor.
4. Discharge all capacitors before servicing motor.
5. Always keep hands and clothing away from
moving parts.
6. Never attempt to measure the temperature rise of
a motor by touch. Temperature rise must be
measured by thermometer, resistance, imbedded
detector, or thermocouple. The temperature of the
outlet surface of the motor may be too hot to the
touch during normal operation.
7. Electrical repairs should be performed by trained
and qualifi ed personnel only.
8. Failure to follow instructions and safe electrical
procedures could result in serious injury or death.
9. If safety guards are required, be sure the guards are in use.
ABB / Low Voltage NEMA Motors / Manual 03-2006
If trouble is experienced in the operation of the
motor, make sure that:
1. The bearings are in good condition and operating
properly.
2. There is no mechanical obstruction to prevent
rotation in the motor or in the driven load.
3. The air gap is uniform.
4. All bolts and nuts are tightened securely.
5. Proper connection to drive machine or load has
been made.
In checking for electrical troubles, be sure that:
1. The line voltage and frequency correspond to the
voltage and frequency stamped on the rating plate of
the motor.
2. The voltage is actually available at motor terminals.
3. The fuses and other protective devices are in proper
condition.
4. All connections and contacts are properly made in
the circuits between the control apparatus and
motor.
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