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F-18F-18

TROUBLESHOOTING & REPAIR

MAIN TRANSFORMER (T1) VOLTAGE TEST (continued)

FIGURE F.5. Input Contactor, Reconnect Panel, and Primary Leads to Main Transformer

Locations

Reconnect Panel

Assembly

T3 W

T2 V

Input Contactor

T1 U

 

 

TOP VIEW

 

INPUT CONTACTOR

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TEST PROCEDURE

1.Disconnect main AC input power to the machine.

2.Using a 3/8” nutdriver, remove roof and sides of case cover.

3.Inspect the input contactor, reconnect panel, and primary leads to the main trans- former for loose or faulty connections. See Figure F.5.

4.Carefully apply input power, turn on and make sure the input contactor (1CR) ener- gizes.

5.Carefully test with an AC voltmeter for the proper main AC input voltage to the line side of the input contactor (1CR). See Wiring Diagram. See Figure F.5.

U to V

V to W

U to W

NOTE: If proper voltage is not present in any or all of the three phases, check input fuses and leads.

5.Test with an AC voltmeter for proper main AC input voltage from the output side of

the input contactor (1CR). See Wiring Diagram. See Figure F.5.

T1 to T2

T2 to T3

T1 to T3

a.If the correct voltage is present, the contactor is working properly.

b.If the correct voltage is not present for any or all of the three phases, the con- tactor may be faulty. See Input

Contactor Test.

6.Test with an AC voltmeter for approximate- ly 97 VAC from each of the six main trans- former secondary leads to the common buss connected to the negative output ter- minal. See Figure F.6.

a.If one or more of the above voltage tests are incorrect, check for loose or faulty wiring. If the wiring is good, then the main transformer may be faulty.

NOTE: A long wire with a clip or a long probe may be required to reach the lower middle lead.

MULTI-SOURCE

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Lincoln Electric SVM155-A service manual Main Transformer T1 Voltage Test, Contactor Test

SVM155-A specifications

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