APU Not Starting

[alandyer]

Not familiar with offsets 3330 thru 3336.

[imported_MattO]

They are in Peter Dowsons Table of Offsets.

You probably know this.... These values of the throttle output go to the engines
directly.

Throttle 1. 88C
Throttle 2. 924
Throttle 3. 9BC
Throttle 4. A54

These are the physical Axis positions of the throttle.

Throttle 1. 3330
Throttle 2. 3332
Throttle 3. 3334
Throttle 4. 3336

Enrico, helped me understand how this works.

Matt O.

[alandyer]

Throttles are analog input.
Nothing to do with states: 2, 3 or otherwise.
I don't want to cloud this thread on APU start switch states by going off on a tangent and discussing analog input and outputs in a force-feedback system like auto-throttles.

[alandyer]

Gert,

I got APU Start to work.
First, I went to local electronic supply store (RadioShack)
and bought a 3 position DPDT toggle switch.
http://www.radioshack.com/product.as...%5Fid=275-1533
Costs around $3.49

Wired center pole of switch to Input "G" on Interfacekit.
Wired other 2 poles to Input 1 and Input 2 on Interfacekit.

I set up the following in FS2PhUIPC.ini:
[APU_OFF]
Offset=560F
Length=1
LoValue=0
HiValue=1
[APU_START]
Offset=560F
Length=1
LoValue=1
HiValue=2

I then configured FS2Phidget:
- assigned APU_OFF to Input 1
- assigned APU_START to Input 2.

By checking "invert" box for APU_OFF (Input 1 in my set up) the center position of switch becomes ON position.

Looks and works just like switch in PM-Systems and real switch in cockpit.

Groete,
Alan.

[Gert van der Winden]

Hi Alan,

Did the same and indeed it works for me to, you don't even have to a DPDT switch with ON-ON-ON. I had only a APEN ON-OFF-ON switch and wired them as follows:

The two center poles on switch to G (ground) and the left one from section one and right one from section two to input one offset:

[APUOff]
Offset=560F
Length=1
LoValue=0
HiValue=1

and one other wire to the left one from section two to input two offset:

[APUStart]
Offset=560F
Length=1
LoValue=1
HiValue=2

The switch is now going first from Off to On and then from On to Start, the only thing is that the switch will go automatic back to his On position afterwards (I don,t no if this is also done on the real aircraft the same !) but . . . it works fine no.

Already did the same with the L Pack and R Pack and Isolation Valve, had to made two new statments in the FS2PhUIPC.ini file Pack1_Off and Pack1_High and add the same Lo and HiValue 0-1 and 1-2 as the APU switch and it works also now.

The only bad side of this that you must have more I/O inputs to asssign all swithes with three functions, I had already 4x 0/16/16 and 1 0/8/8 and one LCDText with have also 8 inputs but this all together is not enough so I must order more at Phidget USA.

I want to thank you for your support and wish you and your family a Merry Christmas and a Happy New Year, (Prettige Kerstdagen en een Gelukkig Nieuw Jaar)

Gert

[737FlightSim]

Glad to hear that the APU is now working. The real 737 APU switch is a three position with the start position being momentary, so it will automatically return to "on" from the start position. It is also a Pull to unlock type of switch, so the handle must be pulled to move it from the "off" to "on" position or from the “on to the "off" position. You must also must pull to move the switch to the start position.

[alandyer]

You used similiar switch to myself !
Ja-nee, I also only needed On-Off-On.