-- 33 --
1sxx02cw
ACH10:5 Mains contactor circuit, energy saving
Mains contactor K1 is controlled by microcontroller on board CB0 via transistors
Q42, Q31 and relay K1 on ACH10 board. RC snubber element C9 suppress
over--voltages transients during turning--off the K1.
Energy saving
If welding source is not used in MIG process longer than 15 minutes, the
microcontroller turns off the contactor K1 and source is in energy saving mode.
Pressing switch on torch enables source for welding (K1 closed again).
ACH10:6 Cooling fan
Cooling fan is controlled in ON/OFF principle by microcontroller on board CB0 via
transistors Q38,Q37 and relay K3 on board ACH10. Fan has two speeds hardware
-- controlled. Until temperature on chopper transistor heatsink is below 80
o
C
temperature sensor B3 is opened and fan is operating on low speed. When
temperature reaches 80
o
C limit, sensor B3 closes, contactor K4 on ACH10 is
powered, capacitor C1 is shorted by K4 contact and fan starts operating at full
speed.
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