| . ALARM SIGNAL (Optional) The SEPA® MFB30GxxA includes a pulse output, which allows 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 2 x rotor speed. The amplitude Is UFAfi-1V and appears periodically. At blocked rotor the output signal could be L (<0.3V) or H (Ufan)- IMPORTANT: The pulse output is not protected against short circuit and must not connect to GND or Vcc without pre-resistor. A pull-up-resistor is not needed. Do not connect not used pulse output (Insulate). Do not touch the rotorf |