Troubleshooting & repair, Capacitor balance test (continued) – Lincoln Electric INVERTEC V250-S User Manual
Page 73
F-41
TROUBLESHOOTING & REPAIR
F-41
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.
CAPACITOR BALANCE TEST (continued)
INVERTEC V250-S
EXPECTED VOLTS
DC AT CAPACITOR
INPUT APPLIED
TERMINALS
460VAC
325VDC
440VAC
311VDC
415VAC
293VDC
380VAC
269VDC
TABLE F.6 Capacitor Voltages
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: