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F-45

TROUBLESHOOTING & REPAIR

F-45

THERMAL PROTECTION AC TRIGGER CIRCUIT (cont.)

FIGURE F.21 - THERMAL PROTECTION AC TRIGGER CIRCUIT

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T1

EXTERNAL

TRIGGER

#212C #212A

2 C

4 D

#223B

PART OF 14 PIN

AMPHENOL

 

 

 

CHOKE

FAN

 

 

 

THERMOSTAT

THERMOSTAT

#503

#503A

 

#224

 

24

 

 

 

 

VOLTS

 

 

 

 

AC

 

 

NORMALLY CLOSED

 

 

 

 

NOTE:

 

10J6

 

 

WHEN THERMOSTATS

 

 

 

TRIP, THE CIRCUIT

 

#212D

POWER

 

 

 

 

WILL BE OPENED

 

#212B

BOARD

 

 

 

 

 

 

 

9J6

 

 

 

 

S4 OUTPUT

 

 

 

 

TERMINAL

 

 

 

 

SWITCH

 

 

 

 

#223A

11J4

CONTROL

4J2

#210

 

 

 

 

BOARD

 

 

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4.Locate the Auxiliary Transformer T1 and leads used for test. See Figure F.21.

5.Turn main power ON.

6.Test Auxiliary Transformer voltage for 24 VAC between leads 503 and 212D. See Figure F.21.

a.If 24 VAC is present, transformer is OK. Go to step 7.

b.If 0 VAC is present, test input voltage to Auxiliary Transformer.

c.If input voltage to Auxiliary Transfor-mer is cor- rect, replace Auxiliary Transformer.

d.If input voltage to Auxiliary Transfor-mer is not correct, check Line Switch S12 and connecting leads.

7.Check that Output Terminal Switch S4 is in the ON position (closed).

8.Test for 24 VAC between leads 223A and 210.

a.If 24 VAC is present, then AC Trigger Circuit is functioning normally.

b.If 0 VAC is present, check Choke Thermostat and Fan Thermostat.

V300-PRO

Page 75
Image 75
Lincoln Electric SVM105-B service manual Figure F.21 Thermal Protection AC Trigger Circuit

SVM105-B specifications

The Lincoln Electric SVM105-B is a state-of-the-art welding machine that represents a leap forward in welding technology, designed for both professionals and enthusiasts in the welding industry. This versatile machine combines robust performance with user-friendly features, making it suitable for a wide range of welding applications.

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