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Installation
Wiring
4.4
P
DANGER :
To avoid electronic shocks and damages to the power distribution of the PLC, for wir-
ing work switch off the PLC on all poles.
Rigid wires with a cross-section of 0.5 to 2.5 mm
1.5 mm
equipped with wire end-sleeves.
4.4.1
Connecting the Supply Voltage
E
ATTENTION:
Check before connecting the ST modules whether the supply voltage from an external
power supply is within the range permissible for the ST module.
The supply voltage of the ST modules should be separated from the supply of the inputs and out-
puts and the supply of the other devices. If there are strong emissions use a separate power
supply which provides 24 V DC for the "SYS" and "AUX" voltages of the ST modules.
The wires with the supply voltage (24 V DC) should be twisted together and laid out in the short-
est possible path. Use the maximum possible cross section for these wires (2.5 mm
The lines for direct current voltage supply (24 V DC) may not be laid out together with lines that
conduct high voltages, high currents, or I/O signals. To the extent possible a minimum clearance
of 100 mm should be maintained between the lines.
Surge suppressors should be used to protect against over-voltage (for example due to light-
ning):
NOTES
The earthing of the surge protector (E1) and that of the MELSEC ST system (E2) must
be executed separately from each other.
Lay out the surge protector in such a manner that it is not tripped by permissible vol-
tage fluctuations.
Also note the instructions for system set-up in chapter 1.3.3.
36
2
can be connected to the terminal blocks of the base modules. Flexible wires must be
AC
2
and flexible wires with a cross-section of 0.5 to
Power
supply for
SYS.
Power
supply for
AUX.
E1
2
).
MELSEC
ST Series
E2
MITSUBISHI ELECTRIC
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