Lincoln Electric SVM140-A service manual G3326 PRO-CUT 55 Output

Return to Section TOC

Return to Master TOC

F-47 F-47

TROUBLESHOOTING & REPAIR

LOW VOLTAGE CIRCUIT TEST (continued)

FIGURE F.13 – OUTBOARD LOW VOLTAGE CIRCUIT TEST POINTS AND LEDs

G3326 PRO-CUT 55 OUTPUT

Return to Section TOC

Return to Master TOC

LED1

C13

LED3

	LED5	J31
		PIN-6
		J32
	D25
		LED4
+		J30
	LED2

Section TOC

Master TOC

PRO-CUT 55 OUTPUT BOARD LED DEFINITIONS

Return to

Return to Section TOC

Return to

Return to Master TOC

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 28 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 acti- vated. 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 55