Mitsubishi MELESEC-ST User Manual page 5

[INSTALLATION PRECAUTIONS]
Make sure to externally shut off all phases of the power supply for the whole system before
mounting or removing a module. Failure to do so may damage the module.
(1) Online replacement of the power distribution module and/or the base module is not
available. When replacing either of the modules, shut off all phases of the external power
supply.
Failure to do so may result in damage to all devices of the MELSEC-ST system.
(2) The I/O modules and the intelligent function modules can be replaced online.
Since online replacement procedures differ depending on the module type, be sure to make
replacement as instructed.
For details, refer to the chapter describing the online module change in the user's manual of
the head module (for the I/O module) or the corresponding intelligent function module.
Do not directly touch the module's conductive parts or electronic components. Doing so may
cause malfunctions or failure of the module.
Make sure to securely connect each cable connector. Failure to do so may cause malfunctions
due to poor contact.
DIN rail must be conductive; make sure to ground it prior to use. Failure to do so may cause
electric shocks or malfunctions. Undertightening can cause a drop, short circuit or malfunction.
Overtightening can cause a drop, short circuit or malfunction due to damage to the screw or
module.
[WIRING PRECAUTIONS]
Completely turn off the external power supply when installing or placing wiring. Not completely
turning off all power could result in electric shock or damage to the product.
Make sure to ground the control panel where the MELSEC-ST system is installed in the manner
specified for the MELSEC-ST system. Failure to do so may cause electric shocks or
malfunctions.
Check the rated voltage and the terminal layout and wire the system correctly. Connecting an
inappropriate power supply or incorrect wiring could result in fire or damage.
Tighten the terminal screws within the specified torque. If the terminal screws are loose, it could
result in short circuits, fire, or erroneous operation. Overtightening may cause damages to the
screws and/or the module, resulting in short circuits or malfunction.
A - 3
CAUTION
!
DANGER
!
CAUTION
!
A - 3