TM-9-1200-215-34-P
AUTOMATIC FIRE CONTROL SYSTEM (AFCS)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
FEBRUARY 1999
TM-9-1200-215-34-P - Page 158 of 266
TM 9–1200–215–34&P
6–4
b.
Physical description. The PCU consists of a single, sealed, enclosure which contains the following
components:
D
Eight (8) connectors (J1–J8)
D
Circuit breakers
D
Transient voltage suppressors
D
EMI Filters
D
Power–up relays
D
Input power loss support circuit
D
Back–up battery charger
D
Status monitors circuit
D
Nuclear event detector
(1)
Eight connectors. As shown in figure 6–2, 28 Vdc vehicle power enters the PCU on connector J4.
Back–up batteries are connected to the PCU on connector J3. Connector J5 is the diagnostic port connection to
the PCU. Power is distributed from the following indicated connectors:
D
J1, J2 – Dual power bus to the:
••
Display Unit (DU)
••
AFCS Computer Unit (ACU)
••
Prognostics/Diagnostics Interface Unit (PDIU)
D
J6 – Outside Component
D
J7 – Outside Component
D
J8 – Outside Component
PCU
J6
J7
J8
J5
J3
J4
(–)
A(
–)
28V CONDITIONED
DISCRETE SIGNALS
28V CONDITIONED
CONDITIONED RETURN
DISCRETE SIGNALS
28V CONDITIONED
CONDITIONED RETURN
CONDITIONED RETURN
28V CONDITIONED
28V UNCONDITIONED
28V UNCONDITIONED
J1 BUS A
J2 BUS B
DIAGNOSTIC
PORT
B
BACKUP BATTERY (+)
BACKUP BATTERY (+)
VEHICLE 28V
28V RETURN
CONDITIONED RETURN
UNCONDITIONED RETURN
28V CONDITIONED
CONDITIONED RETURN
UNCONDITIONED RETURN
Figure 6–2. PCU Power Distribution
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