INSTRUCTIONS AND MAINTENANCE MANUAL
MAC R MOTORS
PAGE:
56
CODE: CTT12 EDITION: 01 DATE: MAY 2013
Subject to technical changes without prior notice
Fault
Probable cause
Corrective action
Overheating
during load-free
operation
Converter output voltage too high,
frequency too low
Check adjustments on frequency converter and
perform auto-tuning
Motor designed to be connected in star
format but is connected in triangle
format
Correct connection in terminal box
Fans stopped or turning in opposite
direction
Connect fan. Invert phase sequence in case of inverse
rotation.
Broken fan
Repair fan or replace it with a new kit
Cooling air is preheated
Ensure the entry of fresh air
Overheating with
load
Excessive load
Reduce load
Converter output voltage too high,
frequency too low
Check adjustments on frequency converter and
perform auto-tuning
Power connection problems
Check the frequency converter and power cables
Motor designed to be connected in star
format but is connected in triangle
format
Correct connection
Fan stopped
Connect fan
Broken fan
Repair fan or replace it with a new kit
Cooling air is preheated
Ensure the entry of fresh air
Overheating on
certain winding
sections
Short-circuit between turns or phase
short-circuit on stator winding.
Determine the winding elements and insulation
elements. Repair them after checking with
manufacturer
Table 24: Electrical faults (2)
NB:
Because the machine must be powered always from a converter, please also check the frequency
converter service instructions in the event of electrical faults.
