Mitsubishi FREQROL-SFJ - Alarm;Warning Display by LED Readout; Under Voltage

8.5
"Alarm/warning"
display by LED readout
(1) UNDER VOLTAGE
This alarm appears if voltage under 170V lasts for longer
than 15ms.
Cause
Checkup Remedy
Tower supply
This alarm appears when speed Increase capacity of
capacity
is changed or load is exces- input power supply.
insufficient sive.
Interval bet- AC power supply should be Prolong AC power sup-
ween turning turned on in minimum 1 sec.
ply off time.
off and on after turned off.
AC power sup-
ply short
Card SFJ-CA1 It should be checked if this Replace the card SFJ-
not in good
alarm is reproducible.
CAl.
condition Replace the card SFJ-CA1 in
use with a new card SFJ-CA1
to check if the same alarm
occurs again.
Use the previous card SFJ-
CA1 again to check if the
same alarm occurs again.
IM-PW power After making sure this alarm
/Replace the IM-PW
unit not in
is reproducible, replace the
/power unit.
good condi-
card SFJ-CA1 in use with
tion
a new card SFJ-CA1 to.check.
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