P
“.4
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IL:
0
(21)
Alarm
No.45(OHF)
Controller Overheat
[This alarm occurs when the thermal protect
which is installed in the controller exceeds
the temperature being set.]
(Ambient temperature:
6O='C
Fin temperature
:
1OO~C'
Item Cause
Check
Remedy
The fan which cools the
o
Check that the fan normally
0
Replace the cooling fan with
1
fin is defective. rotates.
a new one.
(See Section 2.3.)
The ambient temperature
D
Measure the ambient
temper-
o
Unless the cooling unit in
of the amplifier is high.
ature of the amplifier in the
the high voltage panel
cor-
high voltage panel.
rectly
works, replace it
.
with a new one.
2
o
If the ambient temperature
exceeds
55'C,
strengthen
the cooling power.
The equipment is
over-
o
Check the load condition
us-
D
Review the cutting condition
loaded.
ing a load meter or the load
and tool.
display (see Section
1.1.1)
in the status display mode.
o
Decrease the frequency of
3
start and stop operations.
o
Check that
the
equipment is
frequently started and
stopped.
The thermal protector
o
Check that electricity
o
Replace the thermal protec-
(THSZ)
which is
instal-
does not flow between the
tor
THSl
or
THSZ.
led on the fin is
ends of the thermal protec-
(See Section 2.2.)
defective.
tor by referencing Appendix
Alternatively, the
4,
"Main circuit block
dia-
thermal
protector(THS1)
gramn
and Appendix 5,
which detects the
"Spindle amplifier component
4
ambient temperature of
layout".
the amplifier is defec-
tive.
(Note) Separately check
THSl
and
THSZ.
THSl
setting tempera-
ture = 60°C
(Ambient temperature)
THS2
setting tempera-
ture =
100°C
(Fin temperature)
The alarm detection
cir-
o
Replace the SF-CA card with
o
Replace the printed circuit
5
cuit
in the printed
cir-
a new one and check that
board SF-CA card with a
cuit
board SF-CA card is
the equipment correctly
new one.
defective.
works.
(See Section
2.4.4.)
The cooling fan is dirty
0
visually or by touching the
o
Clean the cooling fan using
6
by dust and the cooling
cooling fan, check the
a factory utility air or
effect is degraded.
degree of dirt.
vacuum cleaner.
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37
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