Troubleshooting & repair, Main transformer test (continued) – Lincoln Electric IDEALARC CV-300 User Manual
Page 52
F-13
TROUBLESHOOTING & REPAIR
F-13
IDEALARC CV-300
b.
If voltage is present, continue
test.
13. Locate the following heavy leads
connected to output rectifier bridge:
#221, #222, and #223. See Figure
F.3.
FIGURE F.3 - Location of leads #221,
#222, and #223.
14. Test for 36 VAC.
15. If the correct three-phase input volt-
age is being applied to the main
transformer and some or all of the
secondary voltages are incorrect or
missing, the transformer may be
faulty. Replace.
MAIN TRANSFORMER TEST (CONTINUED)
11. Locate lead #42A (lead #33 on
machine codes below 9900) con-
nected to circuit breaker CB1 and
pin "I" on the 14 pin amphenol con-
nector on the Case Front. See
Figure F.2.
FIGURE F.2 - Main Transformer Test
Points.
12. Test for 42 VAC between lead #42A
at the circuit breaker (lead #33 on
machine codes below 9900) and pin
"I" on the on the amphenol connec-
tor.
a.
If voltage is missing, check for
loose or broken wires between
the test points and the main
transformer. See wiring dia-
gram.
FROM LEAD
#221
#223
#222
TO LEAD
#222
#221
#223
CIRCUIT BREAKER
CB1 (LEAD #42A)
FRONT PANEL
14 PIN AMPHENOL
CONNECTOR (PIN I)
LEAD #222
LEAD #221
LEAD #223
MAIN TRANSFORMER