10.6.4 JPDG Operation
10.6.4.1 JPDG Control Power Distribution 28 V DC
The following I/O characteristics apply to the 28 V dc distribution section of the JPDG:
• Two six-pin connectors (JR and JS) are used for input. Each connector uses pins 1-3 for 28 V dc return and pin 4-6 for
positive 28 V dc to provide steady state current capacity of 40 A at 55°C (131 °F) / 36 A at 70°(158 °F). Two redundant
power supplies feed a single power bus through external ORed diodes.
• Four fused Mate-N-Lok connectors (J1, J2, J3, and J4 having four pins each) are provided to supply 28 V dc power to
remote JPDP or JPDH boards. They can also supply power to JPDL boards when using the proper wire harness. Pins 1-2
are 28 V dc return, pin 3 and 4 are positive 28 V dc. Each positive output is fused for 10 A to protect the circuits
downstream.
• Five fused Mate-N-Lok connectors (JD1-JD5 with self-resetting fuses of 1.6 A in positive lines) are provided to supply
the 28 V power to I/O packs (including PPDA), controllers, and other loads. Pin 1 is positive 28 V dc, and pin 2 is 28 V
dc return. The self resetting fuse rating is temperature dependent. It is 1.6 A at 20 °C, 0.9 A at 55°(131 °F), 0.5 A at 70°C
(158 °F)ambient temperatures.
• Four Mate-N-Lok connectors (JC1-JC4 with self-resetting fuses of 3.75 A in positive lines) are provided to supply the 28
V power to network switches. Pin 1 is positive 28 V dc, and pin 2 is 28 V dc return. The self resetting fuse rating is
temperature dependent. It is 3.75 A at 20°C (68 °F) ambient and derated to 2.0 A at 55°C (131 °F) and 1.5 A at 70°C
(158 °F) ambient temperature.
• Connector P3 is used to connect low-level signals capable of monitoring status switches on each 28 V dc power supply
and sending feedback signals to the PPDA. Pin 1 provides +10 V dc wetting to the status switch for supply 1. The return
is on pin 3. For status switch on power supply 2, pin 2 provides +10 V dc wetting, and the return is on pin 4.
• A DC-62 connector, JA1, is for connection of a PPDA I/O pack. The I/O pack contains status feedback signals for up to
three power distribution boards along with JPDG.
• 50-pin diagnostic ribbon cable connector P2 is supplied at the bottom of the board. When connected, P2 receives
feedback from another power distribution board and passes the signals to the PPDA.
28 V DC Control Power Distribution
Serial
#
Connector
name
Function Pins
Notes/Fuses
1 JR 28 V dc input 1 Pin 1–3 common / return,
Pin 4–6 – positive
These connectors are rated for 50 A under fault
conditions with current limiting provided by the power
source
2 JS 28 V dc input 2 Pin 1–3 common / return,
Pin 4–6 – positive
3 J1 28 V dc output 1 to
JPDH/JPDP
Pins 1–2 dc return, pin 3–4
positive
Pin 3 through FU1, Pin 4 through FU2. 10 A
replaceable fuses
4 J2 28 V dc output 2 to
JPDH/JPDP
Pins 1–2 dc return, pin 3–4
positive
Pin 3 through FU3, Pin 4 through FU4. 10 A
replaceable fuses
5 J3 28 V dc output 3 to
JPDH/JPDP
Pins 1–2 dc return, pin 3–4
positive
Pin 3 through FU5, Pin 4 through FU6. 10 A
replaceable fuses
6 J4 28 V dc output 4 to
JPDH/JPDP
Pins 1–2 dc return, pin 3–4
positive
Pin 3 through FU7, Pin 4 through FU8. 10 A
replaceable fuses
7 JD1 28 V dc output 1 to I/O
pack, Controller
Pin 2 dc return, pin 1
positive
Pin 1 through TR1, 0.8 A self-resetting fuse
8 JD2 28 V dc output 2 to I/O
pack, Controller
Pin 2 dc return, pin 1
positive
Pin 1 through TR2, 0.8 A self-resetting fuse
9 JD3 28 V dc output 3 to I/O
pack, Controller
Pin 2 dc return, pin 1
positive
Pin 1 through TR3, 0.8 A self-resetting fuse
10 JD4 28 V dc output 4 to I/O
pack, Controller
Pin 2 dc return, pin 1
positive
Pin 1 through TR4, 0.8 A self-resetting fuse
11 JD5 28 V dc output 5 to I/O
pack, Controller
Pin 2 dc return, pin 1
positive
Pin 1 through TR5, 0.8 A self-resetting fuse
378 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
Public Information
To Next Page
Loading...
