I
1
1.3
Checking method and
remedy of trouble
classification
B
(22) Alarm
No_46(OHM)
Motor Overheat
[This
alarm
occurs when the thermal protec-
tor which is installed in the motor exceeds
the temperature being set
(145"Cl.l
Item
1
I
Cause
The motor cooling fan
is
defective.
The motor cooling systen
is dirty.
Check that the air in-
take portion of the
motor cooling fan is
clogged with foreign
matter or machine com-
ponents.
The motor is overloaded.
The motor built-in
thermal protector is
defective.
The following cable con-
nections are defective.
Motor Amplifier
side
side
OHS1
-
CON2 pin 3
OHS2
-
CON2 pin 2
Check
o
Visually check that the fan
motor normally rotates.
0
Visually or by touching the
cooling system, check the
degree of dirt.
o
Visually check the position
of the foreign matter or
components.
0
Check the load of the motor
using a load meter or the
load display in the status
display mode
(see Section
1.1.1).
0
Check that the motor is fre-
quently started and stopped.
o
After stopping the motor and
turning the cooling fan to
fully cool the motor, check
that the motor leads
OHS1
and
OHS2 is shortcircuited.
(When they are shortcircuited
the thermal protector is
normal.)
o
Check the wire breakage or
connector imperfect contact
using a circuit tester.
Remedy
3
Replace the motor cooling
fan with a new one.
(See Section 2.8.)
D
Clean the cooling system
using the factory utility
air or vacuum cleaner.
D
Remove the foreign matter.
D
Change the position of the
machine components.
D
Review the cutting condition
and tool.
D
Decreas
the frequency of the
start and stop operations.
D
Shortcircuit
OHS1
and OHS2
of CON2 on the amplifier
side as a temporary repair
and continue the operation.
(See Appendixes l-4 and
l-5)
D
At a convenient time, re-
place the motor with a new
one.
D
Replace the signal cable
with a new one.
D
Repair the connector's
imperfect contact or re-
place the connector with a
new one.
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38
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