3 MECHANICAL IMPLEMENTATION
All products based on the Px4x platform have common hardware architecture. The hardware is modular and
consists of the following main parts:
● Case and terminal blocks
● Boar
ds and modules
● Front panel
The case comprises the housing metalwork and terminal blocks at the rear. The boards fasten into the terminal
blocks and are connected together by a ribbon cable. This ribbon cable connects to the processor in the front
panel.
The following diagram shows an exploded view of a typical product. The diagram shown does not necessarily
represent exactly the product model described in this manual.
Figure 3: Exploded view of IED
3.1 HOUSING VARIANTS
The Px4x range of products are implemented in a range of case sizes. Case dimensions for industrial products
usually follow modular measurement units based on rack sizes. These ar
e: U for height and TE for width, where:
● 1U = 1.75 inches = 44.45 mm
● 1TE = 0.2 inches = 5.08 mm
The products are available in panel-mount or standalone versions. All products are nominally 4U high. This equates
to 177.8 mm or 7 inches.
The cases are pre-finished steel with a conductive covering of aluminium and zinc. This provides good grounding
at all joints, providing a low resistance path to earth that is essential for performance in the presence of external
noise.
The case width depends on the product type and its hardware options. There are three different case widths for
the described range of products: 40TE, 60TE and 80TE. The case dimensions and compatibility criteria are as
follows:
P14x Chapter 3 - Hardware Design
P14xEd1-TM-EN-1 31
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