TM-9-1200-215-34&P Technical Manual for M109 Automatic Fire Control System (AFCS) Download
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TM 9–1200–215–34&P 1–14 ELECTRICAL Communications interface SINCGARS (AN/VRC–89) compatible with TACFIRE FSK messages. Remote terminal communication MIL–STD–1553B data bus. Input power supplied to PCU +28 Vdc + 0.25 Vdc @ maximum of 50 amps, with +18.0 Vdc to +32.0 Vdc range. Maximum PCU transient protection + 250 volts for 0.1 millisecond @ maximum energy of < 15 millijoules. DC grounding resistance <2.5 milliohms at each binding joint. Electrical harness shield bonding 5 milliohms to a mating connector. Shielded interconnect cables Attenuation of at least 40db to electric fields of 10Hz to 400MHz; RF backshell adapter to shield resistance of up to 5 milliohms. Input power supplied to PDIU +24.0 Vdc, with +18.0 Vdc to +33.0 Vdc range. AFCS PERFORMANCE Servo gun tube response Azimuth and elevation within 1 mil. Servo gun tube control: traverse Azimuth: 1422 mils in 22 sec Elevation: 1000 mils in 11 sec AFCS SURVIVABILITY NBC decontamination/cleaning temperature Do not exceed 180° F (82° C). Decontamination water pressure 9 to 11 psi. 1–19. EQUIPMENT CONFIGURATION The AFCS system equipment, the cable interconnects, and the electrical layout of the system units are designed to one configuration only.