Lincoln Electric SVM136-A Theory of Operation, Input Line VOLTAGE, Contactor and Main Transformer

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E-2 E-2

THEORY OF OPERATION

FIGURE E.2 – INPUT LINE VOLTAGE, CONTACTOR AND MAIN TRANSFORMER

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CONTROL

TRANSFORMER

POWER

SWITCH MAIN

TRANSFORMER

R

E

C

O

N

N

E

C

T

INPUT

CONTACTOR

		T		115VAC
TO	REMOTE	E	S
	CONTROL	R	T
CONTROL		M
			R
BOARD		I		FAN
			I
		N
			P
		LA
			s	42VAC

OUTPUT

CONTROL

CONTROL BOARD

G	S	F
		E
A	I
		E
T	G	D
E	N	B
	A	A
	L	C
	S	K

OUTPUT

CAPACITORS

SCR / DIODE

HYBRID BRIDGE

NEGATIVE

OUTPUT

TERMINAL

F

E

E

D

B

A

C

K

POSITIVE

OUTPUT

TERMINAL

SHUNT

14 PIN AMPHENOL

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INPUT LINE VOLTAGE, CONTACTOR AND MAIN TRANSFORMER

The desired three-phase input power is connected to the CV-400 through an input contactor, located in the input box at the rear of the machine. Two phases of the input line are also connected to the control transformer, which, through the power switch, supplies power to activate the input contactor.

A reconnect panel allows the user to configure the machine for the desired input voltage. This AC voltage is applied to the primary of the main transformer.

The transformer changes the high voltage, low current input power to a lower voltage, higher current output.

The finishes or "neutrals" of the main secondary coils are connected together, and the three starts of the sec- ondary windings are connected to the rectifier bridge assembly. In addition, the main transformer has sepa- rate and isolated 115VAC and 42VAC auxiliary wind- ings. The 115VAC is available at the terminal strip and the 14 pin amphenol and is protected by a 10 amp cir- cuit breaker. The 42VAC is available at the 14 pin amphenol only and is also protected by a 10 amp cir- cuit breaker. The three 21VAC phase angle windings are also housed in the main transformer assembly. These windings provide power and "timing" for the con- trol board.

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

IDEALARC CV-400