Mitsubishi FREQROL-SFJ - Over Heat Motor or Resistor Unit

(14) OVER HEAT MOTOR OR RESISTOR UNIT
OHSl/OS2 discontinuous
Cause
24V power
supply
Wrong wiring
7
1 Overload
,Trouble with
j controller cooling
j fan
1 Motor air inlet
i
clogged
f Trouble with motor
I
1 thermosensor
j (thermoswitch)
L. _____ . . ._
-_ .-_.
Checkup
Check if the alarm disappears
when the power is turned on
with CONl,
CON5, CONC and
CONCA disengaged.
Voltage is not output across
terminals A and B (at top of
FR-SFJ).
1.
Check motor for load con-
dition.
2. Check frequency of start/
stop.
Fan does not run satisfac-
torily,
or remains stopped.
Check cooling air flow.
Check if the thermosensor
does not reset when the mo-
tor fan is operated for
15 -
16 min. with the motor
Remedy
Remedy the 24V
power supply wir-
ing.
Jumper pin (Pin 4,
5) settings should,
meet input inter-
face for speed re-
ference and posi-
tion reference 12-
bit signals.
(Refer to the
standard specifi-
cation)
Remedy the wiring.
1.
Lighten load.
2. Reduce start/
stop frequency.
Replace the fan.
Clean the air in-
let.'
-;
I
1. Shortcircuit
i
OHSl-OHS2 to
I
/
continue opera- !
tion (provi-
i
-104-