Troubleshooting & repair, Main transformer test (continued) – Lincoln Electric WIRE-MATIC 255 SVM 119-A Manuel d'utilisation
Page 63
F-12
TROUBLESHOOTING & REPAIR
F-12
WIRE-MATIC 255
MAIN TRANSFORMER TEST (CONTINUED)
Board.
a.
Turn the machine OFF between
each test.
b.
Carefully insert the meter
probes into the back of each
Molex Plug pin cavity to perform
the test.
G2803:
c.
If any of the voltages tested are
incorrect, check for loose or bro-
ken leads between the test
points and the main transformer.
d.
If ALL the voltages tested are
incorrect or missing, go to Step
12.
12. Test for correct nameplate input volt-
age between the H1 lead at the
ON/OFF POWER SWITCH to H2 or
H3 (H5 if connected for 575 VAC) at
the reconnect panel. Voltage tested
will vary depending on Input Voltage
Connection. See wiring diagram for
test point locations.
a.
If the voltage test is incorrect,
- check for loose or broken
leads between the reconnect
panel and the ON/OFF POWER
SWITCH.
- test the ON/OFF POWER
SWITCH for proper operation.
b.
If the correct nameplate voltage
is being applied to the main
transformer and one or more of
the secondary voltages are
missing or are incorrect, the
main transformer may be faulty.
Replace.
4.
Locate the following leads on Plug
J3:
G2803:
5.
Connect main input power to the
machine.
6.
Turn the Wire-Matic 255 ON/OFF
POWER SWITCH to ON.
7.
Make the following voltage tests at
Plug J3.
a.
Turn the machine OFF between
each test.
b.
Carefully insert the meter
probes into the back of each
Molex Plug pin cavity to perform
the test.
G2803:
8.
Turn OFF the machine
9.
Locate the following leads on Plug
J6 on the G2803 Control PC Board.
G2803:
PLUG
LOCATION
1J3
3J3
2J3
LEAD
#202
#203
#204 A
FROM
LEAD
#202
(1J3)
#202
(1J3)
#203
(3J3)
TO
LEAD
#203
(3J3)
#204 A
(2J3)
#204 A
(2J3)
EXPECTED
VOLTAGE
30 VAC
15 VAC
15 VAC
PLUG
LOCATION
4J6
16J6
7J6
LEAD
#206
#208
#209
FROM
LEAD
#208
(16J6)
#208
(16J6)
#209
(7J6)
TO
LEAD
#209
(7J6)
#206
(4J6)
#206
(4J6)
EXPECTED
VOLTAGE
60 VAC
30 VAC
30 VAC
10. Turn ON the machine.
11. Make the following voltage tests at
Plug J6 on the G2803 Control PC