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F-14

TROUBLESHOOTING & REPAIR

F-14

 

 

 

INPUT CONTACTOR TEST (Continued)

FIGURE F.3. INPUT CONTACTOR CONNECTIONS

240

CONTACTOR

241COIL

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1.Disconnect the main input supply power to the machine.

2.With the 3/8” nut driver, remove the case top and the left case side.

3.Locate the two leads connected to the input contactor coil, #240 and #241. See Figure F.3 for location. Note: The discon- nects may be located inside the loom (lead covering).

4.Connect a DC ammeter to either lead #240 or #241.

WARNING

Electric Shock can kill.

With the 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 the power is on. High voltage is present at terminals.

5.Carefully apply the correct voltage to the machine and turn the power switch (S1) ON.

6.Check for approximately 1 amp of current flow at the contactor coil. This current is supplied by the Control Board. NOTE: The pull-in coil current is designed to be about 5 amps for 100ms occurring about one second after the power switch is closed. Without this current pulse, the contactor will not activate.

If the current is present and the contactor does NOT activate, then the input contac- tor coil may be faulty, or the contactor’s moving parts may be stuck. The normal coil resistance is approximately 4.0 ohms.

If the 1 amp DC current is NOT present, check the continuity of the leads between the contactor and the control board. See the Wiring Diagram.

The contactor may also be tested by dis- connecting leads #240 and #241 from the coil and applying an external 120VAC sup- ply to the contactor coil. The contactor should activate.

MULTI-SOURCE

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Lincoln Electric SVM155-A service manual Input Contactor Test, 241COIL

SVM155-A specifications

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