Mitsubishi FREQROL-SF Troubleshooting Manual page 42

[This alarm occurs when the thermal protect
which is installed in the controller exceeds
the temperature being set.]
(Ambient temperature:
Fin temperature
Item Cause
The fan which cools the
fin is defective.
1
The ambient temperature
of the amplifier is high.
2
The equipment is over-
loaded.
3
The thermal protector
led on the fin is
defective.
Alternatively, the
thermal protector(THS1)
which detects the
ambient temperature of
4
the amplifier is defec-
ture = 60°C
(Ambient temperature)
ture = 100°C
(Fin temperature)
The alarm detection cir- o Replace the SF-CA card with
5
defective.
The cooling fan is dirty 0 visually or by touching the
6 by dust and the cooling
effect is degraded.
Check
rotates.
ature of the amplifier in the
high voltage panel.
ing a load meter or the load
display (see Section 1.1.1)
in the status display mode.
equipment is
the
frequently started and
stopped.
does not flow between the
ends of the thermal protec-
tor by referencing Appendix
4, "Main circuit block dia-
"Spindle amplifier component
layout".
(Note)
Separately check THSl
and THSZ.
a new one and check that
the equipment correctly
works.
cooling fan, check the
degree of dirt.
Remedy
a new one.
(See Section 2.3.)
the high voltage panel cor-
with a new one.
exceeds 55'C, strengthen
the cooling power.
and tool.
start and stop operations.
tor THSl or THSZ.
(See Section 2.2.)
board SF-CA card with a
new one.
(See Section 2.4.4.)
a factory utility air or
vacuum cleaner.