PS Engineering PMA8000C Installation Manual - Manual (Page 9)

PS Engineering
PMA8000C Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0303 Page 2-2 Rev. 3, May 2014
32 x ½" screws (475-632-0012). The audio selector panel must be supported at front and rear of the mount-
ing tray.
2.3.4 Audio Panel Tray and Connector Assembly
The rack connectors mate with two 44-pin connectors in the PMA8000C. The connectors are a sub-
miniature crimp-type, and require the use a hand crimp tool, from table below (or equiv.). The connectors
are mounted to the tray back plate with #4-40 screws (475-440-1038), from the inside of the tray and the
mounting block (431-891-0100). Ensure that proper strain relief and chafing precautions are made during
wiring and installation, using the cable clamp (625-001-0002).
Two grounding solder lugs (475-009-0001) are provided, which may be attached to the rear mounting plate
with 2 ea #4-40 x ¼” screws (475-440-0001) with captivated lock washers. These provide a convenient
location to connect the shield ground terminations.
Manufacturer Crimping Tool Positioner Extraction tool
AMP 601966-1 601966-6 91067-1
Daniels AFM8 K42 M24308-1
ITT-Cannon 995-0001-584 995-0001-739 91067-1
Table 2-1 Connector Pin crimping tools
2.4 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. All wires
must be MIL-SPEC in accordance with current regulations. Two- and three-conductor shielded wire must
be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and
soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2B for more information. Failure to use correct techniques may re-
sult in improper operation, electrical noise or unit failure. Damage caused by improper installation will void
the PS Engineering warranty.
2.4.1 Electrical Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PMA8000C power supply is specifically designed to reduce conducted electrical noise on the aircraft
power bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise,
particularly if the amplitude of noise is very high. There must be at least 13.8 VDC present at the connector,
J2 pins 8 & 9, of the PMA8000C for the power supply to work in its designed regulation. Otherwise, it can-
not adequately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon, elec-
tric gyros, switching power supplies, etc.) However, installation combinations can occur where interference
is possible. The PMA8000C was designed in a RFI hardened chassis and has internal Electromagnetic In-
terference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and
ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the air-
frame that are detected by the audio system. Follow the wiring diagram very carefully to help ensure a min-
imum of ground loop potential. Use only Mil Spec shielded wires (MIL-C-275000, or better). Under no
circumstances combine a microphone and headphone wiring into the same shielded bundle. Always use a 2-
or 3-conductor, shield wire as shown on the installation-wiring diagram.
Did You Know?
To help save time, money and preserve the warranty, PS Engineering will custom build your audio panel
wiring harness and ship within 5 business days or we’ll pay for the shipping! Call 865-988-9800 for
more information or visit our website to download the harness order sheet.