Troubleshooting & repair – Lincoln Electric INVERTEC V300-PRO SVM105-B User Manual
Page 72
V300-PRO
TROUBLESHOOTING & REPAIR
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.
F-42
F-42
FIG. F.19 - OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT
OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT TEST (cont.)
THESE LEADS
ARE USED FOR
MONITORING
CAPACITOR
VOLTAGES
SEE TABLE 1
BELOW
#311
#313
52
14
53
51
1J8
3J8
TABLE 1:INPUT VOLTS FOR
460 VOLTS AC
LEADS
NORMAL
52-53
51-53
14-53
14-52
325 VDC
325 VDC
14-15 VDC
315 VDC
OPTOCOUPLER
DEPENDENT ON
PROTECTION BOARD
IF AC TRIGGER
CIRCUIT IS GOOD,
#301 LEAD
IS TAKEN TO
CIRCUIT COMMON
#275D
POWER
BOARD
CONTROL
BOARD
+15 VDC
4J1
5J1
6J6
1J6
1J14
2J14
PROTECTION
BOARD
#302
#275D
(+)
(-)
#301
#305