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TROUBLESHOOTING GUIDE
Table 9 Troubleshooting Guide
Note :
If the reading is not
W ,
accurate measurement with a 500 V megger is required .
Reading must be 3 megohms or above.
Trouble
Possible Cause
Check Methoc
What to do
OCI, lamp
Control
Too low setting of
Is setting dial at the positiois indicated
Set the setting dial to the
ON
circuit
"OL%," "OLT".
by lock paint?
position of lock paint .
board
Too high setting; of
_
"L1MI I .,
Refer
Table 6 and 7 .
to
-
Incorrect Setting of
Readjust .
Thyristor
Defective (deterio
Check thyristor (Fig . 25).
Replace thyristor. (See Main
rated)
Circuit Th ristor on page 10 .)
Motor and
Overloaded
Check load current.
Adjust load .
Reset .
driven
Locking.
Run motor without load, anc see if it locks . Re air motor.
machine
Check load for locking .
Repair driven machine.
Layer shorting in
Run motor with terminals (P) and
N) dis-
. Repair motor.
motor .
connected .
If OCL lamp does not light,
the motor and its circuit are defective .
Grounding of motor
Measure resistance between terminal P)
" Repair motor.
circtut.
(or N) and ground (E) with a multitester .
" Correct wiring .
If the reading is nearly - on the largest
scale of the tester, the circuit is normal .
FU lamp
Thyristor
Defective (deterio-
Check thyristor (Fig . 25).
Replace thyristor.
See Main Circuit
ON
rated).
Th ristor on page 10 .)
Motor
Layer shorting in
Operate only board with (P) and N) dis-
. Repair motor.
motor.
connected .
If fuse is not blown, motor
. Correct wiring .
circuit is defective.
Grounding of motor
Measure resistance across terminal P) (or
" Repair motor.
To replace
c
circuit .
N) and ground (E) with a multitester, and
" Correct wiring .
fuses (1FL,
a
if the reading is nearly - on the largest
2FU, 517U) .
s.
scale of the tester, the circuit is normal .
refer to
°
(See Note .)
Replacement
u,
Control
Defective (phase
if the motor is normal, replace of ThYristor
o
circuit
control circuit) .
control circuit board .
Protection
v
board
Refer to Replacement of Control Fuse .
o
Circuit Board on page 11 .
o
Fuse
Defective (deterio-
rated) .
FL lamp
Motor-
Layer shorting in
Disconnect terminals (J) and (K), and
" Repair motor.
ON
field winding .
measure resistance between terminal (J)
" Replace fuse . (3rU or 4FU) .
and (K) of motor- with a multitester .
If the reading is
co,
field circuit is
disconnected .
Grounding of field
Measure resistance across terminal (.I or K
circuit .
and ground (E) with a multitester, and if
the reading is nearly - on the largest
scale of the te ster, the circ uit is normal .
Control
Defective
I the motor is normal, replace contro'
circuit
board .
See Replacement of Control
CO- CUi1
board
Board on page 11 .
THG lamp
Motor
Over
circuit
!Main
Field circuit
Check l oad current .
Adjust load.
ON
- loading.
Check field current.
Read ust . See Adjustment on Nape 6 .
Locking.
Run motor without load, anc see if it locks. Repair motor .
Check load for locking.
Adjust load .
Blocked air filter .
Refer to the instructions for Industrial
DC Motors (TOE-C435-3) .
Insufficient cooling
Check the blower for correct running
Correct wiring .
with blower .
direction .
MCF lamp
Motor
Cooling blower stop .
Check fan for locking or overloading .
Repair or replace fan.
ON
Check thermal relay for tri pin,, .
TCF lamp
Thyristor cooling fan stop .
Check fan for locking or overloading .
Replace the thyristor cooling an .
See
ON
Where the fan is provided with
Replacement of Thyristor Cooling Fan .
failure senser .
on ", a :,e 11 .
Surge
Main CKT
Excessive surge.
Check fuses (3FU, VU) .
Eliminate cause of surge .
Replace surge
absorber
and fuse .
See Replacement of Surge of
fuse blown
Absorber Fuse and Replacement of
Sur e~ e Absorber .
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