Lincoln Electric SVM135-B service manual 48TROUBLESHOOTING and REPAIRF-48, Current Transducer, P90

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F-48TROUBLESHOOTING AND REPAIRF-48

CURRENT TRANSDUCER TEST (continued)

FIGURE F.11 — CURRENT TRANSDUCER TEST.

NOTE: On later codes the transducer is located on left side of the machine near the output choke.

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CURRENT

TRANSDUCER

TEST PROCEDURE

1.Remove input power to the Power Wave 455.

2.Using the 3/8 in. nutdriver remove the right side case cover.

3.Perform the Capacitor Discharge

Procedure.

4.Locate the current transducer at the lower right front of the machine.

5.Apply the correct input power to the Power Wave 455.

6.Locate plug P90 at the current trans- ducer. Do not remove the plug. Refer to Figure F.11.

1 2 3 4

P90

7.Check for the correct DC supply volt- ages to the current transducer at plug P90.

A.Pin 1 (lead 212+) to pin 4 (lead 216-) should read +15 VDC.

B.Pin 2 (lead 213-) to pin 4 (lead 216+) should read -15 VDC.

8.If either of the supply voltages are low or missing, check the associated leads between the current transducer and the control board. If the leads are OK and the DC supply voltages are not present, the control board may be faulty.

POWER WAVE 455/POWER FEED 10