S0740 800 179/E071123/P64
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ct33_20
20AP1:10 Cooling unit control
Starting the welding equipment
1. The welding data unit senses whether the water lock microswitch, 5S2, is
closed or not.
2. If it is closed, a command to start the pump is generated, and a relay in
the cooler starts the pump and the fan.
3. If welding does not start within 6.5 minutes, the pump is stopped.
The pump is stopped if the water lock microswitch opens.
Starting to weld
1. The welder presses the welding torch trigger switch.
2. The water pump starts if the water lock microswitch is closed.
3. Welding starts.
Stopping welding
1. The welder releases the trigger switch.
2. Welding stops.
3. The water pump continues to run for a further 6.5 minutes.
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.
Flow guard can not be installed in the CoolMini. The flow guard input is
jumpered with wire 541 in the cooler, the behaviour is as if the cooling water is
always flowing.
Microswitch 5S2 in the water lock connector closes when a cooling water hose
is connected to the blue water connector on the front of the cooling unit. The
pump stops if the switch opens.
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