Mitsubishi A2USCPU(S1), User Manual

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4. CPU MODULE
4.4 Handling Precautions
Precautions when handling the CPU module from unpacking to installation are described
below.
(1) Do not drop or allow any impact to the modules case, memory cassette, terminal
block connector, or pin connector.
(2) Do not remove the module printed wiring board from the case. Otherwise, a
malfunction may occur.
(3) Use caution to prevent foreign matter, such as wire chips, falling into the module
during wiring.
If foreign matter enters the module, remove it.
(4) Tighten the module mounting screws and terminal block screws within the tightening
torque range specified shown the table below.
CAUTION
Use the programmable controller under the environment specified in the user's
manual.
Otherwise, it may cause electric shocks, fires, malfunctions, product deterioration or
damage.
Insert the module fixing projection into the fixing hole in the base unit and then tighten
the module screw within the specified torque.
When no screw is tightened, even if the module is installed correctly, it may cause
malfunctiuons, a failure or a drop of the module.
If too tight, it may damage the screw and/or the module, resulting in a drop of the
module, a short circuit or malfunctions.
Connect the extension cable to the connector of the base unit or module.
Check the cable for incomplete connection after connecting it.
Poor electrical contact may cause incorrect inputs and/or outputs.
Insert the memory cassette and fully press it to the memory cassette connector.
Check for incomplete connection after installing it.
Poor electrical contact may cause malfunctions.
Be sure to shut off all phases of the external power supply used by the system before
mounting or removing the module.
Failure to do so may damage the module.
Do not directly touch the conductive part or electronic components of the module.
Doing so may cause malfunctions or a failure of the module.
Screw position Tightening torque range
Module mounting screw (M4 screw) 78 to 118N cm
I/O module (M3.5 screw) 59 to 88N cm
Power supply module terminal screws (M3.5 screw) 59 to 88N cm