Lost voltage reading

[knowlesbg]

lost voltage reading inflight (EMS indicates zero) on both skyviews
in setup menus
Screen Hardware info: voltage reads ok
Sensor debug data: C37 P1 = (cal v =0) (value =0)
Have reset widget settings on both with no change
apart from deleting data and reinstalling is there other areas I should be investigating

Bruce :-/

 

[jakej]

and.... it was working but voltage reading was lost during flight - widget is still displayed. Correct Bruce ?

Jake J

 

[knowlesbg]

yes thats right
the voltage reading I failed to find in setup in your presence the other day was found in "screen Hardware info" when I got home, but the voltage "Sensor Debug Data" is still displaying "0" as is the Widget display

Bruce :-/

 

[jakej]

DS will hopefully reply soon - they are on a weeks break, I think that also applies to support.

Jake J

 

[jakej]

DS - We would like an input to this problem please.

Jake J

 

[dynonsupport]

The SV-EMS-220 (not the main SkyView D37) D37 P1 does need to be connected to voltage to have this work. We've seen a few people get confused on this point.

 

[knowlesbg]

so why I'm not getting a voltage reading from the widget display can be for what reason or cause

Bruce :-/

 

[jakej]

"The SV-EMS-220 (not the main SkyView D37) D37 P1 does need to be connected to voltage to have this work. We've seen a few people get confused on this point. "

refer my comment --- "and.... it was working but voltage reading was lost during flight".

Jake J

 

[dynonsupport]

So to clarify:

Voltage for the EMS widget is read from SV-EMS-220 pin 1. If this has become disconnected, then the voltage on the EMS widget will read 0. Pull the D37 connector off the SV-EMS-220 and make sure there is voltage there (the SkyView debug page is indicating that there isn't).

If this panel has been upgraded from an EMS-D120, then note that this is the power pin for the old EMS. So if there's a breaker or switch that has been turned off that fed this pin, it needs to be turned back on.

Given the circuitry behind that pin, it's unlikely that the SV-EMS-220 box is the culprit without there being other things mis-reading.

 

[knowlesbg]

Ok I gather it must be a faulty connection then

 

[dabear]

So, if the SV EMS is reading system voltage off P1 and gets power from P1, is there an alternative way of wiring?

I was testing my SV with the engine OFF. The battery was powering the SV and the rest of the radios so it obviously was dropping fast. To reduce the load on the aircraft battery, I pulled the breakers for EFIS (1, 2, & 3) and the EMS since they are powered by the SV Screen batteries. When I pulled the breaker for the EMS, the SV shows volts of Zero.

Now, I can understand that. But should I have a alternator failure in flight, I'd like to be able to both shed power load over to the SV battery (pulling SV EFFIS & EMS Breakers) and still monitor the volts left in the aircraft battery. Is there a way to do that? Is there another way to monitor volts?

 

[jlakins]

Bear
Pin 1 and 2 on the EMS are voltmeter inputs, they do not power the EMS.
The EMS is powered by the skyview display over the Skyview bus  (the 9 pin connector).
If you connect pin 1 of the 37 pin connector to the master power bus then you will read battery voltage when ship power to the skyview is turned off.

Jimmie

 

[dynonsupport]

Jimmie's right. In fact, a breaker on the EMS module doesn't really do anything but remove voltage from the pin 1/2 sensing lines since it gets power from the SkyView display.