PS Engineering DRAWS - Manual (Page 8)

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 2-3 Rev 3, Sept. 2012
2.4.2 Power (Pin 25)
The PRD60-Series are compatible with both 14 and 28 Volt DC systems. A one (1) Amp
circuit breaker is required. Power and ground wires must be a minimum #20 AWG pair.
Connect airframe power ground to Pin 13 only.
2.4.3 Audio Message Installation
The audio message installation requires inputs from an external source, such as an engine
gage system. A falling edge (input pulled low) when applied to the appropriate pin of the
connector will cause the message to be played, repeating every two seconds, until the ac-
knowledge (“ACK”) button is pushed.
The message input trigger should have no more than 28 VDC in the high (open) state, and
must be pulled to < 1.0 VDC (but not below ground) in the low, or triggered state. Maxi-
mum sink current, 5 mA.
Install the “ACK” button in a location convenient to the pilot and copilot position. This
switch is a momentary SPST switch between Pin 24 and ground.
The following table contains information regarding various inputs:
Function
EGT or
CHT
Fuel Flow
or Level
Oil Pres-
sure or
tempera-
ture
Volt/
Amp RPM Manifold
Pressure
Message
Number 1 2 3 4 5 6
PRD60 Pin 23 11 9 10 21 8
Message Text
Part number
-0200 only
“Check
tempera-
ture” “Check
fuel” “Check
oil” “Check
battery” “Check
engine
speed” “Check
boost”
Other combinations can be created at additional cost.
NOTE: PS Engineering can only provide input information at this time. Approval basis is
the responsibility of the installer. Contact PS Engineering for more information.
2.4.4 Unswitched Inputs (Pins 3, 4, 15, and 16)
Four 510 unswitched inputs are provided for audio summing on pins 3, 4, 15, and 16
with respect to (WRT) pin 18. These can be used to add audio capability such as TAWS,
autopilot audio, etc, to an audio panel that only has two inputs. The output is on Pin 14.
2.4.5 Headset wiring
The output of the PRD60 is usually presented to the pilot’s headset only, and only the left
ear in a stereo installation. It is critical to the proper operation of this system to have this
connector wiring made in accordance with these diagrams. Use 2- and 3-conductor, MIL-