Lincoln Electric POWER WAVE SVM156-A Service Manual page 85

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STT CURRENT TRANSDUCER TEST (CONTINUED)
5. Turn on the Power Wave 455/R. Check for
the correct DC supply voltage to the current
transducer at plug J8.
A. Pin 8 (lead 812+) to pin 7 (lead 816-)
should read +15 VDC.
B. Pin 4 (lead 813-) to pin 7 (lead 816+)
should read -15 VDC.
If the DC supply voltages are not present,
the control board may be faulty.
6. If both of the supply voltages are low or
missing, check the associated leads
between plug J8 and current transducer plug
P90 and the Control Board.
TROUBLESHOOTING & REPAIR
FIGURE F.14 – RECEPTACLE S7 TRIGGERED
POWER WAVE 455/R
RECEPTACLE
S7
NOTE: The machine can be triggered by
jumpering pin 1 to pin 2 at receptacle
S7. See Figure F. 14.
7. With the Power Wave 455/R triggered,
check the feedback voltage from the current
transducer. The current feedback voltage
can be read at plug J8 on the Control Board.
A. Pin 5 (lead 811) to pin 7 (lead 816)
should read 2.0 VDC (machine loaded
to 50 amps).
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