REHM FOCUS.ARC P 250, Руководство по эксплуатации

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Function description
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8.3 Water recirculation cooling
The compact units FOCUS.ARC P 250W, 300W, 350W, 400W and 450W as well
as the units with separate wire feed case FOCUS.ARC P 250WS, 300WS,
350WS, 400WS and 450WS
are equipped as standard with water recirculation
cooling for the welding torch. A flow monitor in the cooling water return monitors
the flow rate and provides an error message if the flow rate falls below the critical
limit of 0.4 l/min. This protects the welding torch from overheating due to
insufficient water cooling.
8.4 Temperature monitoring of the power units
The welding current is automatically switched off if the permissible temperature
of the power components transformer and transistor switch is exceeded. This is
indicated by the control lamp Operation [BF20] and by an error message in the
main screen. After the power components have cooled down, the system
automatically switches back to the operating state (without power).
8.5 External cooling of the power units
The power units of the FOCUS.ARC P systems are designed for high operational
reliability. Optimum heat dissipation with minimum noise generation is achieved
by the targeted placement of the cooling fan and the power components.
8.6 Fan and water pump control
The FOCUS.ARC P has a demand-oriented fan and water pump control. The fan
and the water pump switch on immediately at the start of welding. After
completion of the welding process, a follow-up time of 7 minutes is set, which can
be changed in the Setup submenu. The fan and the water pump subsequently go
into standby. This reduces noise emission, wear and energy consumption.
To ensure perfect torch cooling during the first welding process, the water pump
is automatically activated after switching on the mains switch until cooling water
flows for 10 seconds in the return flow.