Sandia Aerospace SAC 7-35 - Manual (Page 19)

3.7 FUEL FLOW INTERCONNECT
3.9 BARO INTERFACE
3.8 SYNCHRO INPUTS
The heading synchro heading inputs follow ARINC 407 standard. There are five imput signals;
SYNC-VX, SYNC-VY, SYNC VZ, SYNC VH and SYNC VC. They are available from a
slaved compass system with a boot strap output.
J100
18
Figure 3-5
Fuel Flow Interconnect
Note: SYNC VC is grounded.
Fuel Flow transducers should never have power connected to two sources.
This will cause damage to one of the devices.
The SAC 7-35 accepts Fuel Flow from a pulse type fuel flow transducer, such as the Flow Scan
201 series, that outputs flow rates from 0-14400 GPH (2000 pulses/sec max). The SAC 7-35
can use existing Fuel Flow transducers that are already installed in the aircraft, if they are of the
proper type. The signal and ground wire(s) can be paralleled into the SAC 7-35 (in this case,
power should not be connected from the SAC 7-35). Fuel Flow signals are inputted on J100.
If the aircraft is so equipped, the SAC 7-35 will accept a Baro correction input from the onboard
altimeter. The Baro signals are BARO Pwr and Baro Sig. The baro setting input is a 5Vdc
potentiometer which is included in several common altimeters. The BARO PWR signal is an
accurate 5Vdc output that energizes the potentiometer in the altimeter. The BARO SIG is the
voltage on the wiper of the pot. Representative baro setting versus voltages are:
InHG Volts
28.10 0.484
28.50 1.029
29.00 1.701
29.50 2.364
29.92 2.916
30.06 3.098
30.50 3.664
30.90 4.174
30.99 4.288
Note: If Baro Pot is not connected, Ground Pin 7 on P200
Note: Use Shielded wires grounded at SAC 7-35 end only.