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Noisy operation
Faults During Operation
Deviations from conditions during normal operation, such as an increase in power consumption,
temperatures or vibrations, unusual noises or odours, tripping of monitoring devices, etc., indicate
that the motor is not functioning properly. This can cause faults which can result in eventual or
immediate death, severe injury, or material damage.
Immediately inform the maintenance personnel.
If you are in doubt, immediately switch off the motor, being sure to observe the system-
specific safety conditions.
INSPECTION
Safety Instructions
Before starting work on the motors, make sure that the plant or system has been
disconnected in a manner that is compliant with the appropriate specifications and
regulations.
In addition to the main currents, make sure that supplementary and auxiliary circuits,
particularly in heating devices, are also disconnected.
A motor with frequency converter supply may energize even if the motor is at standstill.
Certain parts of the motor may reach temperatures above 50°C. Physical contact with the
motor could result in burn injuries! Check the temperature of parts before touching them.
General Inspection
Inspect the motor at regular intervals, at least once a year. The frequency of checks depends on, for
example, the humidity level of the ambient air and on the local weather conditions. This can initially
be determined experimentally and must then be strictly adhered to.
Keep the motor clean and ensure free ventilation airflow. If the motor is used in a dusty
environment, the ventilation system must be regularly checked and cleaned.
Check the condition of shaft seals and replace if necessary.
Check the condition of connections and mounting and assembly bolts.
Check the bearing condition by listening for any unusual noise, vibration measurement,
bearing temperature, inspection of spent grease.
Check if the electrical parameters are maintained.
Check if the winding insulation resistances are sufficiently high.
Check if the cables and insulating parts and components are in a good condition and are not
discoloured.
Immediately correct any impermissible deviations that are determined in the inspection.
Short circuit in motor's
winding
One of the phases may be
open
Broken ventilator or lack of
ventilator
One of the phases may be
open
Air gap not uniform
Fan rubbing end shield or fan
cover
Broken ventilator
Incorrect coupling of the
motor with the driven
machine
Broken rotor bar
EN
Rewind the motor
Check the phases on the line
Check the ventilator
Check the phases on the line
Check the bearing fits
Check the fan mounting
Replace the ventilator
Adjust the motor orientation and belt tension
Replace the rotor
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