Theory Of Operation; General Description - Lincoln Electric SVM143-A Operator's Manual

E-2
SOLENOID
TO GUN TRIGGER
AND
DUAL PROCEDURE
WIRE
DRIVE
MOTOR
INPUT
CABLE
RECEPTACLE

GENERAL DESCRIPTION

The DH-10 is a 42 VAC, dual head, 4-roll wire feeder.
A single control for each head is utilized, with dual
procedure presettablility of wire feed speed and arc
voltage. The DH-10 models have controls providing
keypad or remote selectability of wire drive head and
either one or two procedures for each head. Also

THEORY OF OPERATION

FIGURE E.1 — GENERAL DESCRIPTION.
LEFT
WIRE DRIVE
RECEPTACLE
TACH FEEDBACK
CONTROL BOARD
42VDC
VOLTS WFS
ENCODER
ENCODER
offered are four independently selectable gun trigger
modes for each head procedure; cold feed, 2-step and
4-step trigger, and spot weld. The user can also pre-
set timers for each head procedure: preflow, postflow,
burnback, and spot weld times. Five selectable wire
feed acceleration rates can be used to optimize arc
starting. Refer to Figure E.1.
DH-10
SOLENOID
RIGHT
WIRE DRIVE
RECEPTACLE
MOTOR
TACH FEEDBACK
CURRENT SENSING
DISPLAY
BOARD
KEYPAD
E-2
TO GUN TRIGGER
AND
DUAL PROCEDURE
WIRE
DRIVE
REED SWITCH
GROUND
LEAD
PROTECTOR