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The JPDS uses the current limit of the attached power supplies for branch circuit protection. The PPDA I/O pack mounts on
the JPDS board. The JPDS board uses ribbon cable connections for system feedback through the PPDA, including dc bus
voltage, power supply status contact feedback, and auxiliary circuit status.
•
IS420PPDA I/O pack – The optional power diagnostic I/O pack can mount on a JPDG or JPDS board.
•
Vendor Manufactured Control Power Supplies (VMCPS) – There are only certain VMCPS used with the Mark VIeS
control system.
10.1.1.1 PPDA Status Feedback
The Mark VIeS control system can use a PPDA I/O pack for power distribution system feedback. The core JPDx boards can
function without a working connection to the PPDA making it a non-critical element of the system. There are no provisions
for PPDA redundancy without using a fully redundant set of JPDx boards. The PPDA provides timely information supporting
system maintenance. Refer to the section
The PPDA provides five analog signal inputs with an electronic ID for each connected core PDM component. The PPDA
checks the ID lines to determine what boards are attached and then populates the corresponding signal space values. The
PPDA also operates local indicator lamps displaying system status.
Ribbon cables are used to daisy chain other core boards to the board hosting the PPDA. The I/O pack can identify connected
core boards and pass feedback signals to one or two IONet connections. The PPDA has numerous indicator LEDs, providing
visual power distribution status. The PPDA does not take direct protective actions. It only reports information to the Mark
VIeS controller where corrective action can be programmed. Refer to the section Valid PDM Core Board Combinations.
10.1.1.2 Valid PDM Core Board Combinations
The PPDA can receive feedback from as many as six connected core PDM components. The following rules apply when
cabling components into a PPDA:
•
JPDS or JPDG is selected as the power distribution main board that hosts a PPDA I/O pack.
•
A maximum of six boards can be used with a single PPDA I/O pack.
•
A single JPDG board counts as three boards due to the large number of PPDA feedback signals.
•
A maximum of two of any given board type can be used, with the exception of JPDG; only one of each type of these
boards is allowed in chain.
•
When JPDG is used in the system, JPDS cannot be used along with JPDG. Only one JPDE can be used along with JPDG.
Two JPDGs cannot be used in the power distribution diagnostic daisy chain.
10.1.2 Branch Circuit Boards
Branch circuit boards provide additional distribution of dc/ac power for output of the core PDM elements. These boards are
not connected to the PPDA feedback cable. Branch circuit boards are identified as:
•
IS410JPDD distributes a single dc power output into multiple loads. It can be used with a single input of 24 V, 48 V, or
125 V dc. Each load has a switch for maintenance purposes and fuses with a local indicator light.
•
IS2410JPDH is a 28 V dc power distribution board. This board receives 28 V dc power from the R, S and T power
source. It provides up to 24 output connectors of 28 V dc for I/O packs, eight each for R, S and T. These outputs are
protected with a positive temperature coefficient fuse. The JPDH board also provides three unprotected 28 V dc outputs
to be connected to R, S and T Ethernet switches. The JPDH may also be used in daisy-chain mode to distribute 28 V dc
power to more than 24 I/O packs.
302
GEH-6855_Vol_II
PPDA Power Distribution System
GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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