-- 34 --
1sxx02cw
ACH10:7 Cooling liquid pump
Water pump is controlled by microcontroller on board CB0 via transistors Q47,Q36,
relay K2 on ACH10 board.
ACH10:8 Flow guard
When liquid -- cooled torch is connected to wire feeder, board CB0 senses voltage
on pin B10, that pin is pulled up by R34 on board ACH10. Contact in the flow guard
closes when the liquid flow rate exceeds 0.7 l/minute. If liquid is not flowing or the
flow rate is smaller than 0.7 l/minute, an error is displayed and welding process is
stopped.
Machines without a flow guard behave as there was always proper flow rate of
cooling liquid.
All machines without a flow guard, even without liquid cooling system have
connection between X4.1--X4.2.
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