Vascat MAC-HS Series Operation And Maintenance Manual page 61

OPERATION AND MAINTENANCE MANUAL
MAC-HS MOTORS
Fault
Overheating
during load-free
operation
Overheating with
load
Overheating on
certain winding
sections
NB: Because the machine is powered from a frequency converter, please also check the frequency converter service
instructions in the event of electrical faults.
CODE: CTT32 EDITION: 04 RELEASE: SEPTEMBER 2020
Subject to technical changes without prior notice
Probable cause
Converter output voltage too high,
frequency too low
Motor designed to be connected in star
format but is connected in triangle
format
Fans stopped or turning in opposite
direction
Excessive harmonic distortion of
current waves
Fan broken down or airflow insufficient
due to blocked channels
Cooling air is preheated
Excessive load
Converter output voltage too high,
frequency too low
Power connection problems
Excessive harmonic distortion of
current waves
Motor designed to be connected in star
format but is connected in triangle
format
Fan stopped
Fan broken down or airflow insufficient
due to blocked channels
Cooling air is preheated
Short-circuit between turns or phase
short-circuit on stator winding.
Table 30: Electrical faults (2)
Corrective action
Check adjustments on frequency converter and
perform auto-tuning
Correct connection in terminal box
Connect fan. Invert phase sequence in case of inverse
rotation.
Increase drive switch frequency
Repair fan or clean filter
Ensure the entry of fresh air
Reduce load
Check adjustments on frequency converter and
perform auto-tuning
Check the frequency converter and power cables
Increase drive switch frequency
Correct connection
Connect fan
Repair fan or clean filter
Ensure the entry of fresh air
Determine the winding elements and insulation
elements. Repair them after checking with
manufacturer
PAGE: 61