10.5.4.1 JPDE Connections
• JD1 is a 6-pin Mate-N-Lok connector that accepts power input from a battery. Three connector pins each are used for
positive and negative connections to provide adequate current rating.
• JFA, JFB, and JFC are fused four-pin Mate-N-Lok output connectors. Positive power is on pins 1 and 2, and negative
power is on pins 3 and 4. This matches the pin use on JPDD J28 and J28X. These connectors have a fuse rating of 15 A.
• JP1 is the ground reference jumper. The dc bus is normally operated without a hard ground connection. The dc bus is
centered on earth as part of the ground fault detection scheme. Normally, the 24 V operation of the dc positive terminal
would measure ½ * 24 V above ground and the negative terminal has the same magnitude below ground potential.
Resistors to center the bus on earth are supplied externally to the JPDE, or on-board resistors can be used by closing
jumper JP1.
• JPS1 and JPS2 are nine-pin Mate-N-Lok connectors used for power supply input. The connector uses pins 8 and 9 for
positive 24/48 V dc and pins 1-3 for 24 V return providing 24 A steady state capacity. Pin 4 provides positive 10 V dc
wetting to a supply status feedback switch and pin 5 provides the return.
• JS1, JS2, and JS3 are fused and switched four-pin Mate-N-Lok output connectors. Positive power is on pins 1 and 2, and
negative power is on pins 3 and 4. This matches the pin use on JPDD J28 and J28X. The fuse rating for these switched
connectors is 7 A.
• Two 50-pin diagnostic ribbon cable connectors, P1 and P2, are supplied on the top and bottom of the board. Connector
P1 transmits feedback signals to a board hosting a PPDA I/O pack. Connector P2 receives feedback from other power
distribution boards and passes the signals out of P1 to the PPDA.
10.5.5 Specifications
Item
JPDE Specification
Total Board Rating
30 A total dc current from all branch circuits
50 V maximum nominal voltage
Fuse for Connectors JS1-JS3: FU11-12, FU21-22, FU31-32
7 A, 250 V, Bussmann ABC-7 typical
Fuse for Connectors JFA, JFB, JFC: FUA1-2, FUB1-2, FUC1-2
15 A 250 V, Bussmann ABC-15 typical
Board Dimensions
16.51 cm High x 17.8 cm Wide (6.5 in x 7 in)
Mounting six mounting holes
Ambient Rating for Enclosure Design
†
-40 to 70°C (-40 to 158 °F)
PDM Power Distribution Modules GEH-6855_Vol_II System Guide 371
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