Lincoln Electric SVM140-A service manual Capacitor Voltage Test, Test Procedure

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F-21 F-21

TROUBLESHOOTING & REPAIR

PRIMARY POWER BOARD RESISTANCE TEST AND

CAPACITOR VOLTAGE TEST (continued)

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CAPACITOR VOLTAGE TEST

This test will help the technician to determine if the input filter capacitors are being charged equally to the correct voltage levels.

NOTE: This test should only be conducted with the Pro-Cut 55 connected for 400 VAC and above, and with the appropriate input voltage applied.

TEST PROCEDURE

1.Remove main input power to the Pro-Cut 55.

2.Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section.

3.Locate and familiarize yourself with the capacitor test locations on the primary power board. See Figure F.3.

4.The following tests will be performed with the input power applied to the Pro-Cut 55.

BE CAREFUL. ALWAYS REMOVE THE INPUT POWER AND PERFORM THE INPUT FILTER CAPACITOR DISCHARGE PROCEDURE BEFORE TOUCHING ANY MACHINE COMPONENT.

WARNING

ELECTRIC SHOCK can kill.

• Have an electrician install and service this equipment.

•Turn the input power off at the fuse box before working on equipment.

•Do not touch electrically hot parts.

5.Apply the correct input power† and turn ON the Pro-Cut 55.

†NOTE: This test should only be conducted with the Pro-Cut 55 reconnect switch and “A” jumper configured for 400 VAC and above.

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PRO-CUT 55