Chapter 5 – Fault Tracing
5-6
ACS 501 Installation & Start-up Manual
21 MOT CONT
This fault is related to
components in the Motor
Control Card.
• Remove power, wait one
minute, then restore power.
• If the problem persists, call
ABB Technical Support.
Record the specific fault
code, you may be asked for
it.
22 PAR REST
Parameter restoring error.
Parameter checksum does not
match.
• Reset fault display (the
display is reset allowing the
scrolling of parameters, but
the fault is not reset).
• Check all parameter settings
or restore the factor settings.
• Remove power, wait one
minute, then restore power to
check that the fault has
disappeared.
23 UNDER V 2
DC bus voltage does not rise
over 93% of V
N
during five
seconds after connecting the
input power.
• Check supply voltage.
• Call ABB Technical Support.
24 GND FAULT
Ground Fault has been detected
in the motor or motor wiring.
• Check the motor and motor
wiring for grounds faults.
Fault Message
Possible Cause
Remedy
