11. In case
of
electrical malfunctions, be sure
to
investigate
the
following
discrepancies: (Refer to malfunctions and corrective
measures for
complete
details)
No.
Malfunctions
Causes
Corrective
measures
1
Does
not
run
at
low
speed
1.
Defective
L.SW
switch.
2. Motor cord is pulled
out
(does
not
stop at upper
stop
position).
3. Inadequate plug-in
of
bi-directional-
triode
thyristor
printed
board.
4. Wire
of
auxiliary
motor
is dis
connected.
5. Inadequate returning
of
MB
clutch
part..
6. Low speed function changing pin is
connected to the low speed (ofO side.
(Inside
the
control
box).
* Exchange the L.SW switch.
* Plug-in
correctly.
* Plug-in correctly.
*
Connector
inside
the
motor
(end
cover)
is
disconnected.
* Repair
the
clutch
part
with oil stone.
* Replug-in the pin to the
"on"
side.
2
Main
motor
is
over-heated
1. No
clearance
at
clutch
part.
2. One phase
of
3 phases is disconnected
(single phase running).
* Adjust
the
clearance
of
clutch part.
* Inspect the plug-in condition
of
the
power
source cord.
(Verify
the
fuse
of
the
power
source
of
the
plant)
3
Auxiliary
motor
is
over-heated
1. Inadequate returning
of
the MB part.
2. Inadequate lead relay (contact point)
3. One phase
of
3 phases is disconnected.
* Repair the clutch part with oil stone.
* Exchange
the
lead relay.
*
Connector
inside
the
motor
(end
cover)
is
disconnected.
4
Enters
into
low
speed
running
with
the
power
source
"ON".
1. Inadequate position
of
L.SW switch.
2.
Defective
L.SW
switch.
3. 12P
connector
of
head
is
pulled
out
4. Inadequate adjustment of the adjust
ing
knob
of
stopping position.
5. Pedal cord is pulled
out
(make it to
upper
stopping
position).
* Adjust the position
of
L.SWswitch.
* Exchange
the
L.SW switch.
* Re-plug-in
the
connector.
*
Rotate
the
knob
toward
the
"FAST"
direction.
* Re-plug-in
the
connector.
5
Machine
does
not
stop
(keeps
on
running
at low
speed)
1.
Defective
L.SW
switch.
2.
Too
much
clearance
of
magnet
brake.
3.
6A
fuse
is
blown
out.
4. Pressure of returning spring
of
motor
lever
is
too
weak.
5. 12P
connector
of
head
is
pulled
out.
* Exchange
the
L.SW switch.
* Re-adjust the clearance.
* Exchange the 6A fuse.
* Tighten the adjusting screw.
* Re-plug-in correctly.
6
Does
not
rotate
at
low speed.
Thread
trimming
not
performed
and
stops
at
any
position.
1.
lA
fuse
is
blown
out.
* Exchange
the
lA
fuse.
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24
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