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Manual fan speed control - EC motor 230 VAC

This solution controls EC fans in steps. The fan speed can be manually adjusted via the switch. There is no off position. Via internal trimmers, speed positions 1 and 2 can be adjusted. Position 3 is maximum fan speed. We advise to keep the cable length between EC fan and control switch limited (maximum 10 m).

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Control switch, 3 pos., IN: 10 VDC, load max. 1 mA, pos. 1 = 1…10 VDC, pos. 2 = 1...10 VDC, pos. 3 = supply voltage.
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