Troubleshooting And Repair - Lincoln Electric INVERTEC V300-PRO SVM105-B Service Manual

F-42
OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT TEST (cont.)
FIG. F.19 - OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT
THESE LEADS
ARE USED FOR
MONITORING
CAPACITOR
VOLTAGES
SEE TABLE 1
BELOW
TABLE 1:INPUT VOLTS FOR
460 VOLTS AC
LEADS
NORMAL
325 VDC
52-53
325 VDC
51-53
14-15 VDC
14-53
14-52
315 VDC
11. If 15 VDC is present at step 7, test Capacitor volt-
ages using leads shown in Figure F.19.
If voltage does not match table, check reconnect
switches for proper operation and proper position
for voltage applied. Perform Capacitor Balance
Tests.
TROUBLESHOOTING & REPAIR
1J8
52
14
3J8
53
51
PROTECTION
BOARD
OPTOCOUPLER
DEPENDENT ON
PROTECTION BOARD
IF AC TRIGGER
CIRCUIT IS GOOD,
#301 LEAD
IS TAKEN TO
CIRCUIT COMMON
#275D
V300-PRO
#311
1J14
#313
2J14
POWER
BOARD
#301
5J1
CONTROL
BOARD
F-42
(+)
#302
6J6
(-)
#275D
1J6
#305
4J1
+15 VDC