| The SEPA® HYB35D05A includes a speed impulse output, which enables monitoring the correct function of the fan. An alarm-board is available on request. The pulse is like a rectangular wave, the frequency correlates to 3 x rotor speed. At blocked rotor the output signal could be L (<0.6V) or H (Vcc -1V). IMPORTANT: The pulse output is not protected against short circuit and must not connect to GND or Vcc without series-resistor. A pull-up-resistor is not needed. Do not connect not used pulse output to GND or Vcc (insolate). |