Lincoln Electric SVM161-A service manual 1TABLE of CONTENTS-THEORY of Operation Section E-1

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E-1TABLE OF CONTENTS-THEORY OF OPERATION SECTION E-1

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2

Input Board and Bus Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2

Main IGBT Inverter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3

Main Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Output Module and Clamping Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Output Module Transistor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Superimposition Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Control/Display Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5

High Frequency Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5

Output Filter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5

Insulated Gate Bipolar Transistor (IGBT) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-6

FIGURE E.1 - V205-T BLOCK LOGIC DIAGRAM

Fan

Superimposition

board

24 VDC

Bus board

AC DC Gate drive signals

Input

HF

board

board

Voltage Feedback

15,+5-+24,+15,48,-

.inforeconnect

.cktAConturn

supplyvolthigh

feedbackvoltage

feedbackcurrent

Current Feedback

Output

IGBT

Diode

Thermostat

Output

Thermostats

Filter bd.

(bypass)

Main IGBT

& Power board

4

_

IGBT's

Output

RF coil

Choke

+

infothermostat

metervoltinput

metercurrentinput

DC blocking

Current

ckt.AConturn

+515,-+15,

infoset

PWMonturn

capacitor board

Input

Hall

Main

Output

Choke

Output

Device

Transformer

board

Transistor

Module

24 VDC Remote 2/4 path (D + E)

HF control signal

888

+48, +24

Control board

Display & LED

board

Control	(D + E)
	Remote 2/4
Knob

Remote

48 VDC75, 76, 77 A, B, C

Gas

Solenoid

INVERTEC® V205-T AC/DC™