Test Procedures - Lincoln Electric INVERTEC V275-S Service Manual

F-14
CAPACITOR BALANCE TEST
FIGURE F.2 - Capacitor Terminal Locations on the Main Switch Board
TEST PROCEDURE
1. Remove input power to the V275-S.
2. Using a 5/16" nut driver, remove the case wrap-
around.
3. Perform the Input Filter Capacitor Discharge
Procedure detailed earlier in this section.
4. Put the mode switch in the SMAW position and
put the Local/Remote switch in the LOCAL
position.
5. Put the output control R1 at the minimum posi-
tion.
6. Locate and familiarize yourself with the capaci-
tor test locations on the main switch board.
See Figure F.2.
TROUBLESHOOTING & REPAIR
Capacitor (C2) Terminals
207A
206A
Capacitor (C1) Terminals
V275-S
(continued)
202A
- +
203A
7. The following tests will be performed with the
input power applied to the V275-S. BE CARE-
FUL. ALWAYS REMOVE THE INPUT POWER
AND PERFORM THE INPUT FILTER CAPAC-
ITOR DISCHARGE PROCEDURE BEFORE
TOUCHING ANY MACHINE COMPONENT.
8. Apply the correct input power and turn ON the
V275-S.
NOTE: This test should only be conducted with
the V275-S reconnect switch and "A"
jumper configured for 380VAC and above.
F-14