Mitsubishi Electric MELSEC iQ-R Series User Manual page 10

Section 1 SAFETY PRECAUTIONS
＜Connection of terminal block＞
● In case using stranded wire, take measures so that the filament should not vary by using a bar terminal
or by processing the point twisted. Use the bar terminal appropriated for the size of electric wires. If
inappropriate bar terminal is used, a wire breakage or a contact failure may occur, which may cause a
device malfunction, a failure, a burnout or a fire.
● Use appropriate size of electric wires. If inappropriate size of electric wire is used, it may cause a fire due
to generated heat.
＜Connection with the current sensor＞
● When using this module, make sure to use it in combination with the dedicated current sensor. Do not
exceed the rating of the module for input of the current sensor. A secondary side (5A) of transformer
cannot directly input tot this module. For further details, refer the manuals for the current sensor to
maintain the functionalities and the accuracy of the module.
● The dedicated current sensor (excludes EMU2-CT5 and EMU-CT5-A) is used only for low voltage circuit.
It cannot be used for a high voltage circuit. EMU2-CT5 and EMU-CT5-A should be used with secondary
side (5A) of transformer transfixed. If it is connected with a high voltage circuit by mistake, it may cause
a burnout of the device and a fire. It is critically dangerous. For the allowance maximum voltage of current
sensor, refer to "10.4.1" in this manual.
● The dedicated current sensor has a polarity (directionality). Be careful about it when installing the module.
● If the wires connected to the module are strongly pulled off, it may cause a malfunction or a breakage to
the module or the wire.
＜Connection of ground＞
● Do not exceed the specified voltage when doing an insulation resistance test and a commercial frequency
withstand voltage test.
● To prevent persons with little knowledge about electric equipment from electric shock, panel must be
taken either following measure.
・ Lock the panel so that only those who get an education about electrical equipment and have
sufficient knowledge can unlock, or shut off power supply automatically upon opening the panel.
・ Cover the dangerous voltage part of the module.
Caution
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