Troubleshooting & repair, Stt current transducer test (continued) – Lincoln Electric POWER WAVE SVM173-A User Manual
Page 92
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TROUBLESHOOTING & REPAIR
F-46
F-46
POWER WAVE 455M/MSTT
STT CURRENT TRANSDUCER TEST (CONTINUED)
8. If for any reason the machine cannot be
loaded to 50 amps, Table F.6 shows what
feedback voltage is produced at various cur-
rent loads. S.T.T. stud is limited to 325
amps.
9. 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 811 (plug
J8 pin 5) 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.
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