OPERATION AND MAINTENANCE MANUAL
MAC QM MOTORS
PAGE: 53
CODE: CTT42 EDITION: 01 RELEASE: JULY 2016
Subject to technical changes without prior notice
6.4
Operating faults
If faults appear during the operation of the motor, first of all check the possibility of the errors given in the following tables. If the
fault cannot be eliminated with any of the following measures, please contact the technical service at VASCAT.
VOLTAGE
All the work must be carried out with no voltage connected.
HOT SURFACE
Hot motor surfaces. Therefore, cooling times must be observed.
6.4.1
Electrical faults
Fault
Probable cause
Corrective action
Motor doesn't start
Excessive load
Reduce load
Power connection problems
Check the frequency converter, power cables and phase
sequence.
Problems with encoder connections
Check encoder cables and converter alarms
Converter disabled
Check message on converter
Motor starts up
with difficulty
Excessive load
Reduce load
Power connection problems
Check the frequency converter, power cables and phase
sequence.
Short-circuit between turns or phase short-
circuit on stator winding.
Check the elements of each winding phase (milliohmmeter)
and the insulation elements (between phases and between
phases and earth using a megaohmmeter at 250 V). Repair the
winding after consulting VASCAT.
Incorrect motor
rotation direction.
Change of motor power cable polarity
Swap two motor connection phases
Buzzing noise on
start-up
Interruption of a phase in the power cable
after connection
Check the frequency converter and power cables
Short-circuit between turns or phase short-
circuit on stator winding.
Check the elements of each winding phase (milliohmmeter)
and the insulation elements (between phases and between
phases and earth using a megaohmmeter at 250 V). Repair the
winding after consulting VASCAT.
Buzzing noise
during operation
Overload
Reduce load
Interruption of a phase in the power cable
after connection
Check the frequency converter and power cables
Short-circuit between turns or phase short-
circuit on stator winding.
Check the elements of each winding phase (milliohmmeter)
and the insulation elements (between phases and between
phases and earth using a megaohmmeter at 250 V). Repair the
winding after consulting VASCAT.
Table 25: Electrical faults (1)
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