Sec j6.4 ln-7 sequence of operation – Lincoln LN-7 User Manual
Page 16
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Operation
The Lincoln Electric Company
Cleveland, Ohio 44117
SEC J6.4 LN-7 SEQUENCE OF OPERATION
Closes 2-4
pilot relay
and/or I
Energizes welder
Contactor
Electrode now
“hot” to ground
Opens 2-4
De-energizes
welder pilot
relay
and/or I
De-energizes
welder
contactor
I
Electrode is
cold to work
Start Generator
I
Press Gun Trigger
Closes 524-525
I
Energizes 1 CR
Closes 627-539
I ^
Connects wire feed
motor to
power board
1
Energizes
control board
Opens 539-514
Disconnects
motor from
2CR and dynamic
brake resistor
Wire feed motor starts
at low speed and increases
speed to welding speed
I
Arc starts
i
Welding
Release Gun Trigger
I
Opens 524-525
I
De-energizes 1 CR
Opens 539-627
... I
Disconnects wire
feed motor from
power board
De-energizes
control board
---------------- 1---------------
Wire feed motor stops
I
2 CR drops out
I
Unit ready for next weld
Closes 539-514
^ •
Connects wire
feed motor to
2CR and dynamic
brake resistor
I
Motor braking current
pulls in 2CR
Shorts out relay
1 CR to prevent
it pulling in
while motor
brake current is
flowing
__________ I
Closes 7-31A
I
Energizes 7-3 2A
(for optional
auxiliary equipment
user supplied)
Opens 7-31A
De-energizes
auxiliary equipment
January 1972
-16-