Chapter 6 Fault Code Information_VFD-B Series
Revision 10/2005, BE13, SW V4.08 6-5
Fault Name Fault Descriptions Corrective Actions
Ground fault
When (one of) the output terminal(s) is grounded, short
circuit current is more than 50% of AC motor drive rated
current, the AC motor drive power module may be
damaged.
NOTE: The short circuit protection is provided for AC
motor drive protection, not for protection of the user.
1. Check whether the IGBT power module is damaged.
2. Check for possible poor insulation at the output line.
External Base Block.
(Refer to Pr. 08-06)
1. When the external input terminal (B.B) is active, the AC
motor drive output will be turned off.
2. Deactivate the external input terminal (B.B) to operate
the AC motor drive again.
Analog feedback error or ACI
open circuit
1. Check parameter settings and wiring of Analog
feedback (Pr.10-00).
2. Check for possible fault between system response time
and the feedback signal detection time (Pr.10-08).
PG feedback signal error
1. Check parameter settings and signal type of PG
feedback (Pr.10-10 and Pr.10-11).
2. Check if the wiring of PG card is correct.
Auto Tuning Error
1. Check cabling between drive and motor
2. Retry again
EF when preliminary count
value attained
1. Check counter trigger signal
2. Check Pr.03-09, Pr.03-11setting
Under Current
1. Check Load current
2. Check Pr.06-12 to Pr.06-15 setting
Phase Loss
Check Power Source Input if all 3 input phases are
connected without loose contacts.
6.2 Reset
There are three methods to reset the AC motor drive after solving the fault:
1. Press
RESET
STOP
key on PU01.
2. Set external terminal to “RESET” (set one of Pr.04-04~Pr.04-09 to 05) and then set to be ON.
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