Defect rotor / broken rotor bars Check the broken bars and end
rings.
Winding / phase short circuit
Motor overhaul is needed
Overheating of the machinery
during operation with load
Overload
Reduce the load
Cooling is prevented by dust
accumulation
Ensure proper cooling and
cleanliness
Interruption of one phase
Check connection and switches
Short circuit on the ground
Repair in workshop needed
Imbalance of the power supply Check
the
cables
and
transformer for faults
Motor vibrations
Wrong allignment
Allign the motor
Substrucutre is unstable
Reinforce substructure
Imbalance in clutch / gearbox
Balance clutch / gearbox
Imbalance in driven machinery
Re-balance the machinery
system
Defect bearing
Exchange the bearing
Multi-phase motor runs single-
phase
Check the circuit
Operation noise
Circulating parts grinding
Correct the mounting
Winding / phase short circuit
Motor overhaul
Interruption of one phase
Check connection and switches
High bearing temperature
Motor shaft bent or damaged
Straighten or replace the shaft
Wrong belt drive
Reduce belt tension, arrange
pulley closer to the bearing
Wrong allignment
Allign the machinery
Inadequate / excess grease
Note the amount of re-grease
Table 9
. Troubleshooting
SEVA-tec GmbH - Lether Gerwerbestrasse 10 - 26197 Ahlhorn - www.seva-tec.de
14
Failure
Cause
Actions
The machinery doesn’t start
Overload
Reduce the load
Wrong stator connection
Check the connection
Fault power supply
Check that power supply
complies with information on
nameplate
Interruption of one phase
Check connection and switches
Mechanical fault
Check that motor rotates
freely. Check the bearing and
lubrication.
Rotor defect
Check the broken bars and end
rings.
Fuses burnt
Use suitable fuses
The machinery is accelerating
slow / doesn’t accelerate
Load inertia at start to high
Reduce the load
Under-voltage
at
motor
terminals due to the voltage
drop
Use higher voltage or higher
transformer stage or reduce
the load. Use appropriate cable
cross-section.
9. Troubleshooting
Table 9
addresses the causes of errors that may occur and the action to be taken. All procedures are
only allowed to be carried out by qualified personnel using suitable tools and instruments.
For further information please contact SEVA-tec GmbH.
