Lincoln Electric POWER WAVE SVM156-A Service Manual page 82

F-36
POWER WAVE CURRENT TRANSDUCER TEST (CONTINUED)
8. If for any reason the machine cannot be
loaded to 250 amps, Table F.6 shows what
feedback voltage is produced at various cur-
rent loads.
9. If the correct supply voltages are applied to
the current transducer, and with the machine
loaded, the feedback voltage is missing or
TABLE F.6 - CURRENT FEEDBACK AT VARIOUS OUTPUT LOADS
OUTPUT LOAD CURRENT
TROUBLESHOOTING & REPAIR
500
450
400
350
300
250
200
150
100
50
POWER WAVE 455/R
not correct, the current transducer may be
faulty. Also make certain that lead 211
(plug J8 pin 1) has continuity (zero ohms)
between the current transducer and the
control board. See the Wiring Diagram.
10. Install the right side case cover using the
3/8" nut driver.
EXPECTED TRANSDUCER FEEDBACK
VOLTAGE
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
F-36