JurgenRoeland
New Member
- Joined
- Oct 12, 2023
- Messages
- 23
This may seems like a trivial question but I didn't find any answer in manuals. it's vpx related and not directly Skyview. My skyview is running well so far and I'm very happy with it. My excuses upfront but I'm not strong in electrics stuff. I've been able to get my vpx and basic circuits running and starting FFW work now.
I was wondering if the alternator field switch controlled by the VPX (J12-11) has any logic in it to be off when the battery master is off.
My master switch is installed as per the manual using a switch input that controls the battery master contactor. The VPX is on the switched side as per Vans manuals.
I read somewhere that if the battery is off and only the alternator would be operating, high voltage spikes may occur and irregular power distribution can happen and that the alternator should only be on when the battery master is on (like with the dual knob red switches on cessna's).
I have a regular on/off SPST input switch for the master contactor and had planned another simple ON/OFF SPST for the alternator switch.
In my current temporary setup, the VPX switches off when I turn the master switch down because the battery gets disconnected and the VPX goes off as I haven't got the alternator installed yet.
But will the same thing happen if the alternator is installed and providing power by the engine ? The alternator is on the switched side and still powering the VPX,
I assume only the battery is disconnected then but the VPX probably continues to be on as the alternator still gives power to the VPX.
If that is the case, is there any logic in J12-11 that would switch off also the alternator if the master is off.
The manual of vpx talks about overvoltage protection on the J12-11 Field line but it's not saying anything about the fact if the alternator is controlled by the VPX
thanks for any hint in the right direction
I was wondering if the alternator field switch controlled by the VPX (J12-11) has any logic in it to be off when the battery master is off.
My master switch is installed as per the manual using a switch input that controls the battery master contactor. The VPX is on the switched side as per Vans manuals.
I read somewhere that if the battery is off and only the alternator would be operating, high voltage spikes may occur and irregular power distribution can happen and that the alternator should only be on when the battery master is on (like with the dual knob red switches on cessna's).
I have a regular on/off SPST input switch for the master contactor and had planned another simple ON/OFF SPST for the alternator switch.
In my current temporary setup, the VPX switches off when I turn the master switch down because the battery gets disconnected and the VPX goes off as I haven't got the alternator installed yet.
But will the same thing happen if the alternator is installed and providing power by the engine ? The alternator is on the switched side and still powering the VPX,
I assume only the battery is disconnected then but the VPX probably continues to be on as the alternator still gives power to the VPX.
If that is the case, is there any logic in J12-11 that would switch off also the alternator if the master is off.
The manual of vpx talks about overvoltage protection on the J12-11 Field line but it's not saying anything about the fact if the alternator is controlled by the VPX
thanks for any hint in the right direction