Lincoln Electric 10372 Service Manual page 113

F-49
9. Check the feedback voltage from the
current transducer. With the Power
Wave system in a constant current
mode and the machine loaded to 250
amps, the current feedback voltage
can be read at plug P90.
A. Pin 3 (lead 211) to pin 4 (lead
216) should read 2.0 VDC (machine
loaded to 250 amps).
10. If for any reason the machine cannot
be loaded to 250 amps, Table F.5
shows what feedback voltage is pro-
duced at various current loads.
TROUBLESHOOTING ND REP IR
CURRENT TR NSDUCER TEST ( ontinued)
T BLE F.5 — CURRENT FEEDB CK
OUTPUT LO D CURRENT
500
450
400
350
300
250
200
150
100
POWER W VE 455/POWER FEED 10
T V RIOUS OUTPUT LO DS.
EXPECTED TR NSDUCER FEEDB CK
VOLT GE
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
11. If the correct supply voltages are
applied to the current transducer, and
with the machine loaded, the feedback
voltage is missing or not correct, the
current transducer may be faulty. Also
make certain that lead #211 has conti-
nuity (zero ohms) between the current
transducer and the control board. See
wiring diagram.
12. Install the right side case cover using
the 3/8 in. nutdriver.
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