9.3 Cause and Remedy of Failure at Electrical Circuit Section
9-6
HW0480311
HW0480311
9.3 Cause and Remedy of Failure at Electrical Circuit
Section
Table. 13 Fault Analyses for Electrical Circuit Section
No. Failure Cause Remedy
1
Power supply indicator lamp does
not light even if the power supply
switch is turned ON.
Power supply indicator lamp
failure, improper contact
Check contacting sec-
tions. Replace the power
supply indicator lamp.
2
Cooling fan
does not
rotate even if
power sup-
ply switch is
turned ON.
Power supply
indicator lamp
lights.
Cooling fan or control circuit
failure
Check the cooling fan
and the printed board
(MB)-021 and (SD)-006.
Fuse F1, F2 (5A) blown Investigate the cause and
replace the fuse.
Fuse (10 A) on the board
Pr(SD)-006 blown
Investigate the cause and
replace the fuse (10 A)
on the board Pr(SD)-006.
Power supply
indicator lamp
does not light.
Power supply indicator lamp
failure, improper contact
Check contacting sec-
tions. Replace the power
supply indicator lamp.
3
The welding source does not
start although the start signal is
turned ON.
The start signal is not sent to
the welding source.
• Check for the welding
command cable.
• Check for insertion of
the connector (CR4) on
the printed board (CR)-
008.
3
Although the
start signal is
ON, only the
motor does
not operate.
Voltage is
applied to the
motor terminals
(between #A and
#B of the con-
nector CON4)
Motor failure Replace the motor.
The voltage is
not applied to the
motor terminals
(between #A and
#B of the con-
nector CON4).
Disconnection of the device
control cable, or improper
contact of the connector
Replace the device con-
trol cable or check con-
tacting sections.
Fuse (10A) on the board
Pr(SD)-006 blown
Upon investigating the
error cause, replace the
fuse (10A) on the printed
board Pr(SD)-006.
Printed board (SD)-006 fail-
ure
Check and replace the
printed board (SD)-006.
5
Welding current (welding current
command) cannot be changed
from the robot side.
The analog command sent
from the robot side is not nor-
mal.
Check the analog com-
mand output on the robot
side.
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