Vacon NX - Page 45

Fault codes and software
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4
F3 Earth fault
F3 displayed.
Check logged
data in
fault history.
Did fault occur
several times when
motor was running?
Did fault occur in
standby-mode?
NO
External fault.
Software trigged the sum of
motor phase current is not zero.
Damaged motor or motor
cable.
NO
Disconnect
motor cable
from drive and
give start
command.
YES
YES
Internal fault.
Check current
measurement circuit.
Did F3
appear
again?
YES
Measure output
currents in all
phases.
Are all phases
equal?
NO
YES
NO
FIGURE 5. Fault code F3