Lincoln Electric SVM101-B 1J8 #311 1J14 6J6 #302, #313 #275D, 3J8 2J14 1J6, #301 #305, 5J1 4J1

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F-42 TROUBLESHOOTING & REPAIR F-42

OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT TEST (cont.)

FIG. F.19 - OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT

52

1J8

#311

1J14

6J6

#302

(+)

THESE LEADS

#313

#275D

(-)

ARE USED FOR

14

3J8

2J14

1J6

MONITORING

CAPACITOR

53

POWER

VOLTAGES

SEE TABLE 1

51

BOARD

PROTECTION

BELOW

BOARD

OPTOCOUPLER

#301

#305

DEPENDENT ON

PROTECTION BOARD

TABLE 1:INPUT VOLTS FOR

460 VOLTS AC

IF AC TRIGGER

5J1

4J1

LEADS

NORMAL

CIRCUIT IS GOOD,

#301 LEAD

52-53

325 VDC

IS TAKEN TO

51-53

325 VDC

+15 VDC

CIRCUIT COMMON

14-53

14-15 VDC

CONTROL

#275D

14-52

315 VDC

BOARD

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.

V300-I