10
PDM Power Distribution Modules
10.1
Power Distribution Overview
The Power Distribution Modules (PDM) are designed specifically for the Mark control systems. The term PDM is used as a
name for all of the individual pieces forming the power distribution for a control system. The PDM uses individual boards to
accept and condition primary control power inputs of 125 V dc, 48 V dc, 24 V dc, and 100 to 250 V ac for use in redundant
combinations. Applied power is distributed to system terminal boards for use in field circuits and converted to 28 V dc for
operation of the Mark VIeS I/O modules. The PDM is divided into two different categories: core and branch.
Core distribution circuits are a portion of the PDM serving as the primary power management for a cabinet or series of
cabinets. Input power from one or more sources is received by a corresponding module or board. The power is distributed to
terminal boards and one or more bulk power supplies producing 28 V dc power to operate the control electronics. The 28 V
power is monitored and distributed by one or more 28 V output boards.
The 28 V dc control power output boards (JPDS and JPDG) can host an IS420PPDAH1B I/O pack to provide power system
feedback. Ribbon cables can daisy chain other core boards in the system to the board holding the PPDA. Complete
monitoring and system feedback sets this power system apart from conventional methods of power distribution. Bulk power
supplies are considered a part of the core PDM system.
Branch circuit boards split the power output from the PDM core components into individual ac and dc circuits for use in the
cabinets. Elements receiving power from the branch circuits provide their own power status feedback signals to the control
system. Branch circuit elements are usually single circuit boards. Branch circuits do not connect to the PPDA I/O pack for
system feedback.
Note
For more information, refer to the
Mark VIeS Functional Safety Control Systems Power Distribution Modules (PDM)
Application Guide for General Market
(GEI-100861) and the
Mark VIe Power Distribution Module Summary Sheet
(GEI-100870).
10.1.1
Core Components
The following core components have primary control power inputs of 125 V dc, or 24 V dc:
•
IS410JPDE
24/48 V dc input board mounts on a sheet metal structure. Power input is accepted from a battery and two dc
power supplies. An optional dc circuit breaker and filter are available for use with a battery power source. The JPDE
board distributes the dc power to terminal boards and other loads. In small systems, JPDE can be used between a battery
and 150 W dc power supplies. The JPDE board uses ribbon cable connections for system feedback through the PPDA,
including dc bus voltage, ground fault detection, and individual branch circuit status.
•
IS410JPDG
provides distribution of 28 V dc (control power) and 48 V or 24 V dc (wetting power) to other boards within
the control system. For both control and wetting power, the JPDG supports dual redundant power supply inputs through
external diodes. JPDG provides fuse protection for all 28 V dc and 24/48 V dc outputs. The PPDA I/O pack mounts on
the JPDG board.
For wetting power distribution, the JPDG is able to operate at either 24 V dc or 48 V dc. The JPDG supports a floating dc bus
for wetting power that is centered on earth by using resistors. It provides voltage feedback through the PPDA to detect system
ground faults, and integrates into the PDM system feedback. JPDG can support sensing and diagnostic for two ac signals,
which are distributed outside this board.
•
IS410JPDS
28 V dc control power output board mounts on a sheet metal structure. The JPDS circuit board contains three
independent 28 V dc power buses with one bulk power supply input for each bus. Barrier screw terminals connect the
power buses when a single bus with multiple supplies is desired. Output circuits from JPDS do not contain fuses with the
exception of three auxiliary circuits.
PDM Power Distribution Modules
GEH-6855_Vol_II System Guide 301
Public Information
