ESAB Origo Feed 304 M12 Series, Service Manual

Page: 28 / 40

DESCRIPTION OF OPERATION
0740 800 144 - 28 - © ESAB AB 2018
13AP1:11 Current relay, Creep start / Normal start
The new version of the control board, 0487 166 8xx
The first version of the control board, 0486 205 886
Current relay
The current relay operates if the welding current exceeds 20 A. If the crater filling function
has been selected, it will work only when the current relay has operated.
Creep start
The creep start function is activated when switch 13SA2 is open. Creep start means that the
motor runs at a speed of 1.9 m/min until the current relay is activated. When the relay
operates, the speed increases to the set speed.
The new version of the control board, 0487 166 8xx: If the current relay does not operate
within 3 s after starting, the motor speed increases to the set speed in any case.
The first version of the control board, 0486 205 886: If the current relay does not operate
within 1 s after starting, the motor speed increases to the set speed in any case.
13AP1:12 Start / Stop
The trigger switch in the welding torch is supplied at 42 V AC. Closing the switch energises
optocoupler IC10, pulling down the voltage across C46.
When the Miggytrac or the Railtrac is used, the start signal to the feed unit is supplied by the
remote input.
The new version of the control board, 0487 166 8xx: When wire feed starts, the power
source generates welding voltage. If this is not followed by a flow of welding current within
3 s, the power source shuts down the welding power supply, although wire feed continues
until the welding torch switch is released.