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E-2

E-2

THEORY OF OPERATION

FIGURE E.2 – INPUT LINE VOLTAGE

 

 

 

 

 

 

 

 

 

 

WORK

 

 

 

 

 

 

 

 

 

 

NOZZLE

 

 

 

POWER BOARD

 

 

 

 

 

ELECTRODE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAIN

 

 

TORCH

 

 

 

CR 1

 

 

 

TRANSFORMER

OUTPUT BOARD

 

CONNECTOR

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

INPUT

 

 

IGBT

 

 

 

 

 

 

L

LINE

INPUT

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

C

SWITCH

RECTIFIER

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

R

 

 

 

CAPACITOR

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

CHOKE

E

 

 

R

 

 

 

 

 

 

S

 

 

 

 

 

 

 

 

 

 

 

E

IGBT

 

 

 

 

PILOT

 

O

 

 

C

 

 

 

 

TRANSISTOR

 

L

 

 

 

 

 

 

 

 

E

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N

 

 

N

 

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

O

 

 

E

 

 

 

 

 

 

 

I

 

 

 

 

 

 

 

 

 

D

 

 

C

IGBT

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

CURRENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S

 

 

TRANSFORMER

 

 

TRIGGER & SAFETY

 

 

 

 

 

 

 

 

 

 

W

 

 

 

 

 

 

 

 

 

 

I

CAPACITOR

 

 

 

 

 

 

AIR

 

 

T

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

SOLENOID

 

 

H

 

 

 

 

 

 

 

 

 

 

 

IGBT

 

 

 

 

 

 

 

 

AIR

P

 

 

 

 

TRIGGER & SAFETY

 

 

 

 

R

 

 

 

 

 

 

 

 

 

PRESSURE

O

 

 

 

 

 

 

 

 

 

SWITCH

T

CR 1

IGBT

 

 

 

 

 

 

 

"A"

E

RELAY

 

 

 

 

 

 

 

 

C

DRIVE

GATE

 

 

 

 

 

 

 

 

T

SIGNALS

 

 

 

 

 

 

 

 

SIGNAL

 

 

ELECTRODE & TRANSFER

 

 

 

 

L

I

 

 

 

 

 

 

 

O

 

 

 

 

CURRENT FEEDBACK

 

 

 

 

E

N

SIGNAL

 

 

 

 

 

 

 

 

 

 

 

 

PILOT ENABLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

CONTROL BOARD

ELECTRODE SOLENOID ENABLE

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AIR SOLENOID ENABLE

 

 

 

 

 

 

18/36VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

A

T

S

 

 

 

 

 

 

 

E

I

H

A

 

 

 

 

 

 

THERMOSTATS

R

E

F

 

 

 

 

 

 

A

 

 

 

 

 

 

 

L

R

E

 

 

 

 

 

 

 

D

M

T

 

 

 

 

 

 

 

Y

O

A

Y

 

 

 

FAN

 

 

 

 

W

L

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

MOTORS

 

 

 

 

 

 

 

 

 

 

 

CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DISPLAY BOARD

 

 

 

 

 

 

 

 

 

 

 

 

12VAC

 

 

 

 

 

 

 

 

 

 

 

24VAC

 

AUXILIARY

TRANSFORMER

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GENERAL DESCRIPTION

The Pro-Cut 55 is a constant current, continuous con- trol plasma cutting power source. The inverter based power supply design is controlled by a microprocessor control board. The control system has a safety mech- anism to insure that the nozzle and electrode are in place before cutting or gouging. The Pro-Cut 55 initi- ates the plasma arc with a simple, yet reliable, touch start mechanism. This system eliminates many of the problems associated with hi-frequency type start sys- tems.

INPUT LINE VOLTAGE,

CONTACTOR AND MAIN

TRANSFORMER

The single-phase or three-phase input power of 200- 230 or 400 to 460 volts AC is connected to the machine, via an input line cord, to a switch located on the front panel.

A reconnect panel and voltage range switch allow the user to configure the machine for either a low or high input voltage and also connect the auxiliary trans- former for the appropriate input voltage.

The auxiliary transformer develops the appropriate AC voltages to operate the cooling fans, the control board and the plasma output board.

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

PRO-CUT 55

Page 29
Image 29
Lincoln Electric SVM140-A service manual Theory of Operation, Input Line Voltage Contactor and Main Transformer