Troubleshooting & repair, Test procedure, Main transformer test (continued) – Lincoln Electric IDEALARC CV-300 User Manual
Page 51: Warning
F-12
TROUBLESHOOTING & REPAIR
F-12
IDEALARC CV-300
TEST PROCEDURE
The ON/OFF POWER SWITCH will be
"hot" during these tests.
__________________________
NOTE: Secondary voltages will vary pro-
portionably with the primary AC input
voltage.
1.
Disconnect the main input power to
the machine.
2.
Remove the case roof and case side
panels.
3.
Test for correct three-phase voltage
being applied to the main trans-
former.
a.
If the correct three-phase volt-
age is being applied to the main
transformer, continue test.
b.
If the incorrect three-phase volt-
age is not being applied to the
main transformer, correct before
proceeding with test.
4.
Locate plug J3 on the Control PC
Board.
5.
Locate the following leads on plug
J3: #200, #201, #202, and #203.
6.
Re-connect main input power to the
machine.
7.
Turn the ON/OFF POWER SWITCH
to ON.
8.
Test for 12 VAC
a.
Insert the meter probes careful-
ly into the back of each Molex
Plug pin cavity until electrical
contact is made to perform the
test.
9.
Locate lead # 33 connected to cir-
cuit breaker CB2 and pin "J" (lead
#31) on the 14 pin amphenol con-
nector located on the Case Front.
See Figure F.1.
FIGURE F.1 - Main Transformer Test
Points.
10. Test for 115 VAC between lead #33
at circuit breaker and pin "J" (lead
#31) on the amphenol connector.
a. If voltage is missing, check for
loose or broken wires between
test points and main trans-
former. See CV-300 wiring dia-
gram.
b.
If voltage is present, continue
test.
MAIN TRANSFORMER TEST (CONTINUED)
CIRCUIT BREAKER
CB2 (LEAD #33)
FRONT PANEL
14 PIN AMPHENOL
CONNECTOR (PIN J)
WARNING
FROM LEAD
#200
#202
TO LEAD
#201
#203