Motor Controllers AC Variable Frequency Drives Type VariFlex
3
RVLF
Specications are subject to change without notice. Pictures are just an example. For special features and/or customization, please ask to our sales network. 13/12/2017 123
5.3. Troubleshooting of the Inverter
5.3.1. Quick troubleshooting of the Inverter
INV Fault
Visually check controller
and Drive boards
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Check burnt and
damaged parts
Consult with the supplier
Replace fuse
Consult with the supplier
Consult with the supplier
Check according to
displayed fault messages
Replace the pre-charge
resistor
Check terminals and
wiring
Consult with the supplier
Perform detailed check and
consult with the supplier
Is fault known?
Symptoms other than burn
out, damage, or fuse
meltdown in the inverter?
Any Symptoms of burn
out and damage?
Is the main circuit DM
intact?
Fault signal?
Is the fuse intact？
Is the main circuit
I.G.B.T intact?
Any visual
abnormalities?
Are displays and
indicators of the
operating unit working
normally?
Is +5V control voltage
correct?
Is the DC input voltage
controlling the power
correct
Any fault display?
What’s the message?
Is LED lit?
Replace control board
and digital operating unit
Is the error eliminated
after replacing control
board?
YES
NO
NO YES
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
Apply the power
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