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F-41

TROUBLESHOOTING & REPAIR

F-41

 

 

CAPACITOR BALANCE TEST (continued)

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8.Check for the appropriate voltages outlined in Table F.6. Note: Voltages may vary with the input line voltage.

In the event the capacitor voltage is too high or not balanced (within 20VDC) the protection circuit will pre- vent output. The overvoltage trip set- ting is nominal line voltage (230/460) +15%. Reset occurs about 3% lower (230/460) +12%.

9.If the capacitor voltages are NOT balanced within 20VDC the capaci- tors may be need “conditioning” . See maintenance section.

The capacitors or other components on the power board may be faulty. Replace power board.

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TABLE F.6 Capacitor Voltages

 

EXPECTED VOLTS

 

DC AT CAPACITOR

INPUT APPLIED

TERMINALS

 

 

460VAC

325VDC

440VAC

311VDC

415VAC

293VDC

380VAC

269VDC

 

 

NOTE

The following machine parts must be replaced in matched sets If Capacitor C1 is found to be defective, both Capacitors C1 and C2 must be replaced at the same time:

INVERTEC V250-S

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Lincoln Electric V250-S service manual Table F.6 Capacitor Voltages