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Components
EXTERNAL COMPONENTS
FRONT DOOR
FACE FRAME
FACEPACK
FACE FRAME LATCH
FACEPACK CABLE
SPARE DECODER FUSES AND TOOL
SPARE FUSE HOLDERS
WALL MOUNT BRACKET
WIRE TIES FOR STRAIN RELIEF
FACEPACK CABLE
The facepack cable connection is located beneath the
Status Light. It is a standard connector with a locking
lever on one side, which must be pressed in to remove the
cable.
SPARE DECODER FUSES AND TOOL
ACC2 Decoder is shipped with spare 20A automotive
fuses and a fuse pulling tool. These are only for use as
replacements in the decoder output modules, to enhance
surge protection on the eld wiring. Replacements can be
purchased at most automotive parts stores.
PCU BOARD
The replaceable PCU (Power Conditioning Unit) board
has only a single screw and can be replaced if necessary.
The board plugs directly into the back plane. This board
contains components that are used by all decoder output
modules, and the status LED indicates whether the board
has power and is operational.
SLIDE LOCK
The slide lock secures the decoder output modules in
place. When it is open, power is o to the facepack, and an
orange indicator is shown. The controller will not operate
if the slide lock is open, and the Status LED will ash
orange to indicate this condition.
EARTH GROUND LUG
A heavy-duty earth ground lug is provided for lightning
and surge protection. This connection is for equipment
safety only. It should always be connected with heavy
copper wire to approved grounding hardware buried in the
earth at least 8' (2.5 m) away from the controller, and as
far as possible away from the two-wire paths.
Generally, earth ground hardware consists of an 8'
(2.5 m) copper-clad steel rod driven all the way into earth,
or a 8' (2.5 m) x 4" (100 mm) wide copper plate, or both,
or comparable earth grounding hardware as approved by
local code.
Do not connect the primary AC power earth ground wire
to this lug. ACC2 provides safety ground connection inside
the transformer wiring compartment.
Decoder wire paths also require additional earth
grounding every 1,000' (300 m), or every 12 decoders, at
minimum. ICD decoders include built-in surge protection,
with a bare copper wire for connection to earth. In high-
lightning areas, ground more frequently.
Decoder earth ground should meet the same specication
as the controller ground: 8' (2.5 m) copper-clad steel rod
driven all the way into earth, or a 8' (2.5 m) x 4" (100 mm)
wide copper plate, located at right angles to the two-wire
path, at least 8' (2.5 m) away from the two-wire path.
INTERNAL COMPONENTS
PCU BOARD
SLIDE LOCK
OUTPUT MODULE SLOTS
FLOW EXPANSION SLOT
EARTH GROUND LUG
TRANSFORMER ASSEMBLY
WIRING COMPARTMENT COVER
POWER SUPPLY BOARD
FLOW SENSOR INPUTS
STATUS LIGHT
PROGRAMMING PORT
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