Lincoln Electric DC-655 service manual Main Transformer T1 Voltage Test

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F-23 F-23

TROUBLESHOOTING & REPAIR

MAIN TRANSFORMER (T1) VOLTAGE TEST (continued)

FIGURE F.6 – INPUT CONTACTOR AND PRIMARY LEADS

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TEST PROCEDURE

1.Disconnect the main input power from the DC-655.

2.Inspect the input contactor, reconnect panel and primary leads to the main trans- former for loose or faulty connections. See Figure F.6. Remove the case sides.

3.Confirm that the reconnect panel is config- ured correctly for the three-phase AC input power supplied to the DC-655. See the connection diagram located on the inside of the input box assembly.

4.Connect the correct AC three-phase input power to the DC-655 machine.

WARNING

ELECTRIC SHOCK can kill.

• Do not touch electrically hot parts.

5.Turn the power switch (SW1) to the ON position.

6.Make sure the input contactor (CR1) ener- gizes.

7.Test with an AC voltmeter for the proper main AC input voltages applied to the line side of the input contactor (CR1). See the Wiring Diagram. If the correct voltages are not present at the line side of the input contactor, check the input fuses and leads.

a.L1 to L2

b.L2 to L3

c.L1 to L3

8.Test with an AC voltmeter for the proper AC input voltages at the output side of the input contactor (CR1). See the Wiring Diagram. If the correct voltages are not present, perform the Input Contactor

Test.

a.T1 to T2

b.T2 to T3

c.T1 to T3

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IDEALARC DC-655