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TROUBLESHOOTING & REPAIR |
CAPACITOR BALANCE TEST (cont.)
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STATIC CAPACITOR TEST
TEST PROCEDURE:
1.With Output Terminal Switch S4 in REMOTE (OFF) position, turn Power Switch ON.
2.Test VDC across terminals 9 and 12 of one Switch Board (see Fig F.7). Repeat the test for the other Switch Board. See Table F.1 in this procedure for expected voltage readings.
NOTE: For 575 VAC only machines, compare volt- age across 9A and 13 and 13 and 12A; then 9B and 15 and 15 and 12B.
3.Record VDC measured for each Switch Board and determine the difference in VDC.
NOTE: The following measurements should result based on VAC input.
TABLE F.1 — EXPECTED VOLTAGE READINGS.
| VDC at Switch |
|
|
| |
| Board Terminals |
|
| should be |
|
If VAC Input is: | approximately: |
|
|
|
|
575VAC | 407 VDC |
|
460 VAC | 325 VDC |
|
440 VAC | 311 VDC |
|
415 VAC | 293 VDC |
|
380 VAC | 269 VDC |
|
|
|
|
a.If less than 25 VDC difference is measured between the Switch Boards, then capacior balance is OK.
•This indicates that Capacitors C1 and C2, Resistors R1 and R9 are OK.
•(575 VAC only machines — Capacitors C1, C2, C14, and C15; Resistors R1 and R9 are OK.)
b.If more than 25 VDC difference is measured between the Switch Boards, test each of the fol- lowing components:
•Capacitors C1 and C2 and Resistors R1 and R9.
•(575 VAC only machines
DYNAMIC CAPACITOR TEST
TEST PROCEDURE:
1.Move Output Terminal Switch S4 to ON position.
Adjust the output control to the minimum setting. Place the mode control at the SMAW (soft) position.
2.Test VDC across terminals 9 and 12 of one Switch Board (see Fig. F.7). Repeat the test for the other Switch Board. See Table F.1 for expected voltages
NOTE: For 575 VAC ONLY, compare voltage across 9A and 13 and 13 and 12A; then 9B and 15 and 15 and 12B.
3.Record VDC measured for each Switch Board and determine the difference in VDC. (See Table F1).
a.If less than 15 VDC difference is measured between the Switch Boards, test is OK.
b.If more than 15 VDC difference is measured between the Switch Boards, the Power Board or Switch Board is damaged. See SWITCH BOARD test and POWER BOARD test.
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