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F-20

TROUBLESHOOTING AND REPAIR

F-20

 

MAIN SWITCH BOARD TEST PROCEDURE (continued)

FIGURE F.2 - CAPACITOR TERMINAL LOCATIONS

RESISTOR

 

 

RESISTOR

CAPACITOR

 

TERMINALS

CAPACITOR

 

TERMINALS

TEST PROCEDURE

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1.Remove input power to the INVERTEC® V450-PRO.

2.Perform the Capacitor Discharge Procedure.

3.Use a DC voltmeter to check that the voltage is not present across the terminals on three capacitors.

4.Locate label and remove leads 19C and 19D from the reconnect switches with the 3/8” wrench. Note lead placement for reassembly. Clear leads. See Figure F.2.

5.Using the Analog ohmmeter, perform the following resistance tests. See Figure F.2 for the test points. Any readings below 100 ohms can be considered a short circuit. However, readings usually are below 30 ohms. A short on any of the following points indicates a possible failed switch board.

Check 11/12 to -20 and 11/12 to +19

Check 15/16 to -20 and 15/16 to +19

Check 13/14 to -20 and +19 to 13/14

Check 17/18 to -20 and +19 to 17/18

6.If any test fails (measures a short) isolate the PC board and retest, if board still fails, replace switch board. See Switch Board Removal and Replacement.

7.If the switch board tests are OK, check the molex pin connections and associated wiring from the switch boards to the control board. See the Wiring Diagram.

8.Reconnect leads 19C and 19D to the reconnect switches. Ensure that the leads are installed in the same location they were removed from.

9.Install the right and left case sides and top using the 3/8” nut driver.

INVERTEC® V450-PRO

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Lincoln Electric SVM199-A service manual Main Switch Board Test Procedure

SVM199-A specifications

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