ESAB Arc 4000i Service Manual page 45

Starting the welding equipment
1.
2.
3.
If the water flow stops when the pump is started, the fault indication lamp on
the MMC will flash. Machines with a display panel show fault code 29.
The pump is stopped if microswitch 13S1 opens.
Starting to weld
1.
2.
3.
If water flow is not detected within three seconds, the pump is stopped.
If the water flow stops during welding, welding will be interrupted and the fault
indication lamp on the MMC panel will flash. Machines with a display show
fault code 29.
Stopping welding
1.
2.
3.
If welding is restarted while the pump is still running, the pump will continue to
run as required, i.e. the 6.5 minute shutdown countdown is interrupted.
cu19_20_2
The MMC panel senses whether microswitch 13S1 in the wire feed unit is
closed.
If 13S1 is closed, the panel generates a command to start the pump. If
water flow is not detected within 15 seconds, the pump is stopped.
If welding does not start within 6.5 minutes, the pump is stopped.
The welder presses the trigger switch on the welding gun.
The water pump starts if microswitch 13S1 is closed.
If water flow is achieved within three seconds, welding starts.
The welder releases the welding gun trigger switch.
Welding stops.
The water pump continues to run for a further 6.5 minutes.
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S0740 800 191/E080229/P78