Lincoln Electric V155-S service manual Figure E.3 Input Board

E-3	THEORY OF OPERATION	E-3
	FIGURE E.3 — INPUT BOARD

Return to Master TOC

								BLUE
	ON/OFF SWITCH			5	2		WHITE
				4	1	WHITE
		L	WIRE TIE			BLUE		PWR1 PWR2 PWR4 PW
						BLACK	AC1
		N				WHITE	AC2	INPUT BOARD
		G
115/230Vac							PE	W05X0701
								(SCHEMATIC: X0701)
50/60	Hz							RECONNECT
								BOARD
						BLUE		W05X0408

R3	DC+
	DC-
JP1

RED BLACK

RED		DC+
BLACK		DC-
JP1	Y/G	PE
		JP1	INVERTER BOARD
			W05X0519
			(SCHEMATIC: X0519)

Return to Master TOC

		FAN	WHITE	RED		JP4	(SCHEMATIC: X0408)
TWISTED CABLE				BLACK
RIBBON CABLE
PCB CONNECTOR CAVITY NUMBERING SEQUENCE
(VIEWED FROM COMPONENT SIDE OF P.C. BOARD)
1	4		2		16
	4 PINS		1	16 PINS	15

CONTROL BOARD
W05X0708-1
(SCHEMATIC: X0708)
PE	JP2

P1

N1

RED

BLACK

WHITE

SHUNT	-
	WHITE
BLACK
	RED

Return to Section TOC

Return to Section TOC

Return to Section TOC

Section TOC

Return to Master TOC

Master TOC

INPUT BOARD

The Input Board includes the following circuits:

- Automatic Reconnect Circuit: This circuit monitors the input voltage and automatically reconnects the inverter and auxiliary connections to configure the machine for either 115V or 230V ac input voltage. The proper configuration is achieved through the use of board mounted relays. These relays and others that activate the Pre-charge circuitry and the fan circuit are controlled through signals from a micro-processor on the board.

- Switching Power Supply: Supplied by a board mounted transformer, the switching power supply provides +15 vdc and +5vdc supplies for use on all of the PC Boards.

- Input Rectifier and Precharge Circuit: The Pre- charge rectifier and current limiting resistors apply a small charge to the filter capacitors when the Power Switch is turned ON.

An improper input voltage would be recognized dur- ing this time and an input error sent to the Control Board. A signal from the Control Board would prevent further power-up to prevent damage to the Inverter Board.

- The re-connect relays then apply full power from the input line (AC1 and AC2) to the Input Rectifier and the capacitors are fully charged to approximately 325VDC. (See the Machine Diagram and PC Board Schematics for more information).

-A self reseting fuse circuit (ARFU) onAutotheResetInputFuse:Board helps to prevent damage to the machine from over-current when in 120VAC opera- tion. When the fuse is open, the output will be dis- abled and the yellow Temperature LED on the front panel will be ON.

Return to

Return to

NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion

INVERTEC® V155-S