YASKAWA YWE-EH500-6N0 Instruction Manual page 78

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