Mitsubishi A2USCPU(S1), User Manual

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8. LOADING AND INSTALLATION
8.4 Installing the Base Units
Precautions concerning installation of the main base unit and extension base unit are
described next.
8.4.1 Precautions when installing programmable controller
Precautions concerning the installation of programmable controller to the panel, etc. are
explained below.
(1) To improve the ventilation and to facilitate the exchange of the module, provide at
least 30mm (1.18inch) of distance between the top part of the module and any
structure or part.
However, when A52B, A55B, A58B, A62B, A65B or A68B extension base unit is
used, provide at least 80mm (3.15inch) of distance between the top of the unit and
any structural part.
(2) Do not install vertically or horizontally, because of concerns with ventilation.
(3) If there are any protrusions, dents or distortion on the installation surface of the base
unit, an excessive force is applied to the printed-circuit board and causes problems,
so, install to a flat surface.
(4) Avoid sharing the same panel with any source of vibration such as a large-sized
magnetic contactor or no-fuse breaker, and install to a separate panel or away from
such devices.
(5) Provide wiring ducts as necessary.
However, when the clearance of the top and bottom of the programmable controller
are smaller than those shown in figure 8.1, pay attention to the following:
(a) When installing to the top of programmable controller, to improve the ventilation,
keep the height of the duct to 50mm (1.97inch) or below.
In addition, the distance from the top of the programmable controller should be
sufficient for tightening and loosening works for the mounting screws on the top
of the module.
The module cannot be replaced if the screws on the top of the module cannot be
loosened or tightened.
(b) When installing to the bottom part of the programmable controller, provide a
sufficient space so that the 100/200VAC input line of the power supply module, I/
O wires of I/O modules and 12/24VDC lines are not affected.
(6) If any device is installed in front of the programmable controller (i.e. installed in the
back of the door), position it to secure at least 100mm (3.94inch) of distance to avoid
the effects of radiated noise and heat.
Also, keep at least 50mm (1.97inch) distance from the base unit to any device placed
on right or left or the unit.
(7) When installing the base unit to DIN rail in an environment with large vibration, use a
vibration-proofing bracket (A1S-PLT-D). Mounting the vibration-proofing bracket
(A1S-PLT-D) enhances the resistance to vibration.
Depending on the environment to set up the base unit, it is also recommended to fix
the base unit to the control panel directly.