Main Circuit Fault - Mitsubishi FREQROL-SFJ Maintenance Manual

Cause
Overload
Trouble with CON2
cable or motor
built-in encoder
Trouble with card
SFJ-CA1
Trouble with con-
trol unit
This alarm occurs if the main circuit is not in good con-
dition.
Cause
Trouble with card
Trouble with con-
trol unit
Checkup
Load (read on load meter)
is larger than 120%.
Rotate the motor shaft with
"READY" signal turned off
with hand and check speed
indication by the LED read-
After making sure this alarm
is reproducible, replace the
card SFJ-CA1 in use with
a new card SFJ-CA1 to check.
Check that speed can be in-
creased to desired speed in
open loop control mode.
Check speed indication by
the LED readout.
Checkup
Replace the card SFJ-CA1 with Replace the card
; a new card SFJ-DA1 to check.
If the same alarm occurs
again with a new card SFJ-
CAL, the control unit is
likely to be defective.
Remedy
/Replace the CON2
Replace the card
Replace the con-
trol unit.
Remedy
with a new one.
Replace the con-