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F-33

F-33

TROUBLESHOOTING & REPAIR

TRIGGER CIRCUIT TEST (continued)

FIGURE F.10 - OUTPUT BOARD TRIGGER CIRCUIT TEST POINTS AND LEDS

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X4

(B12)

(B21)

X2

(B11)

TEST POINT

D29

 

 

 

 

 

G3439 PRO-CUT 80 OUTPUT

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

TEST POINT

 

C13

 

 

 

 

 

 

 

D25

LED3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED5

 

 

 

 

 

 

 

 

LED1

 

 

 

 

 

LED4

 

 

 

 

 

LED2

J33

X20

X40

J31

 

J34

J32

J30

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PRO-CUT 80 OUTPUT BOARD LED DEFINITIONS

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LED1: (Red) This light indicates that 24 VAC is being supplied to the output board from the aux- iliary transformer. It also shows that the 24 VAC is being rectified to approximately 32 VDC. This DC voltage is used for the "parts-in-place" check for the torch circuit.

LED2: (Red) This light indicates that 12 VAC is being supplied to the output board from the aux- iliary transformer. It also shows that the 12 VAC is being rectified to approximately 17 VDC. This DC voltage is used to power the trigger circuit and solenoid driver circuits incorporated on the output board.

LED3: (Green) This light indicates that the air solenoid driver circuit is functioning. When this LED is lit, the air solenoid should be activated.

LED4: (Green) This light indicates that the trig- ger circuit on the output board has been activat- ed. This LED should be lit when the torch or remote trigger is closed. This trigger circuit, on the output board, then sends a signal to the control board.

LED5: (Green) This light indicates that the elec- trode solenoid driver circuit is functioning. When this light is lit, the electrode solenoid should be activated. The electrode solenoid should be energized during gas (air) pre-flow time. During pilot and cutting arc periods, the LED should be off. When the arc goes out, the machine enters the post-flow state. Two seconds after the start of post-flow the electrode solenoid is activated a few times. The LED should blink to indicate this activity. The electrode solenoid will then be energized for the duration of post-flow. (The LED should be on.)

PRO-CUT 80

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Lincoln Electric SVM146-A service manual PRO-CUT 80 Output Board LED Definitions

SVM146-A specifications

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