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TROUBLESHOOTING & REPAIR
INPUT CONTACTOR TEST (continued)
FIGURE F.5 - INPUT CONTACTOR TEST POINTS
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243
244
TEST PROCEDURE
1.Remove input power to the machine.
2.With the 5/16" nut driver, remove the machine top and sides.
3.Locate the two leads, #243 and #244, con- nected to the input contactor coil. See Figure F5.
4.Connect the volt/ohmmeter to the leads.
WARNING
ELECTRIC SHOCK can kill.
•With input power ON, there are high voltages inside the machine. Do not reach into the machine or touch any internal part of the machine while power is on.
WARNING
ELECTRICAL ARCING can injure.
•Never mechanically close the contactor with input power (line voltage) applied and the machine contactor cover removed.
5.Turn on input power to the machine and press the Start button.
6.Check for 120 VAC at the contactor coil leads.
•If 120 VAC is NOT present when the Start button is pressed, check the normally closed (NC) secondary thermostat, the power Start/Stop pushbutton and associat- ed circuitry. See Figure F.6, Input Contactor (CR1) Simplified Control Circuit. Also per- form the Pilot Transformer Test.
•If 120 VAC is present and the contactor does not activate, the input contactor is faulty. Replace.
SQUARE WAVE TIG 355
