Hello to everybody.

I use a 12V - 10A power supply to power AsiAir Plus. I use AsiAir 12V power outputs to feed the following devices:

  1. 12V output to feed HEQ-5Pro mount
  2. 12V output to feed Belt Defog Heater
  3. 12V output to feed Asi294 Pro camera

When I switch ON the Belt Defog Haeter, the red led on HEQ-5Pro start flashing. When switched OFF and mount is moving (during a GoTO), Led sometimes switch OFF then ON quicly 1 time, 2 time then remain correcty ON.
I got some HEQ-5Pro treat discussion on different forum and this behavours seems to be related to a under voltage issue.
Power supply Voltage is 12,15 but Voltage satatus on AsiAir App is always 11,7.

So I have 2 questions :

  1. What is the min and max power voltage supported by AsiAir Plus ?
  2. 12V power output port are internally regulated or not ? In other words, if asiAir is powered at 13,8V what is the
    output voltage of output port when are active ? 13,8V or 12V.

Many thanks for any informations regarding this issue.

Ernesto

  • w7ay replied to this.

    Ernesto221 What is the min and max power voltage supported by AsiAir Plus ?

    Ernesto, ZWO claims a range from 11V - 15V for the DC input in the ASIAIR specs.

    However, I returned an ASIAIR to my dealer because it would not boot at 14V, before realizing that the replacement also did not boot.

    Turns out the replacement failed at about 13.75V, which means that it will not work if you have a freshly charged SLA battery, together with low impedance power cables. I have since adjusted the power supply that I use with the ASIAIR down to 13.6V or so.

    Either there should be a personnel change in the documentation department, or in the QA department. Both could not have done their work properly for two units in a row to not meet the specs.

    12V power output port are internally regulated or not ?

    Beware using those ports, they are not DC output ports. Unless they are 100% turned on, they are cheap pulse width modulated (PWM) output that looks like repeated pulses that swings between something close to 0V to something close to the 12V DC input voltage.

    PWM is only good for regulating average power. You cannot use them to obtain regulated voltage, because it is not DC.

    Chen

      Hello Chen, Thank you very much for the infos.
      I just finish to assembly a new Power Supply. 10A Vout adjustable from 11,3 to 13,8V. I used 16AWG DC wires with silicon sheathing to maintain flexibility even at low temperature. 10A should be enought to power Asiair and drive from it the mount, EAF, ASI 224,(HEQ-5Pro), ASI 294Pro and 2 Belt Defog Heater. I'm waiting clear sky.
      I let you know the result soon.



      Ciao

      Ernesto

      • w7ay replied to this.

        Ernesto221 Vout adjustable from 11,3 to 13,8V. I used 16AWG DC wires

        Hi again, Ernesto,

        Based on my experience with two of the third generation ASIAIR, if the device does not boot up, try dropping the voltage below 13.5 volts.

        You should be fine, otherwise.

        Good luck.

        Chen

            w7ay

            Hello Chan,

            Yestarday night the sky was clear so I tested some new entry included the power supply. I set output voltage at 13,00 V and now the mount seems to work pefectly, then mount LED stop to start blinking ramdomly.

            One step haed ........

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