Hardware manual

AH500 Hardware Manual
5-3
5.1 Wiring
 Points for attention
DANGER
 Before installing or wiring a module, users need to make sure that the external power supply is
turned off. If the power supply is not turned off, users may get an electric shock, or the product
may be damaged.
 If the installation of the module or the wiring of the module is complete, users need to make sure
that a terminal block cover is installed on the module before they turn on the power supply or
operate the module. If the terminal block cover is not installed properly, users may get an
electric shock, or the module may not operate normally.
 Be sure to connect the terminals FG and LG with protective grounding conductors. Otherwise,
users may get an electric shock, or the module may not operate normally.
 To ensure that a PLC is wired correctly, users need to check the rated voltage of the product,
and the arrangement of the terminals. If the PLC is connected to the power supply which does
not conform to the rated voltage, or the product is not wired correctly, a fire accident will occur,
or the product will be damaged.
 The external connections should be crimped or press-welded by specific tools, or soldered
correctly. The improper connections will result in a short circuit, a fire accident, or erroneous
operation.
 Tighten the terminal screws with the specified torque. If the terminal screws are loose, a short
circuit, a fire accident, or erroneous operation will occur. Tightening the terminal screws too far,
may cause damage to the terminal screws and the module, resulting in a short circuit or a
malfunction.
 Make sure that there are no foreign substances such as iron filings or wiring debris inside the
module. Theses foreign substances may result in a fire accident, damage, or erroneous
operation.
 Wiring an I/O module
(1) Terminals with insulation sleeves can not be arranged as a terminal block. It is recommended that the
terminals be covered with insulation tubes.
(2) Please use single-core cables or twin-core cables. The diameters of the cables used should be in the
range of 12 AWG to 22 AWG. The torques applied to the screw terminals should be in the range of 5
kg-cm (4.3 Ib-in) to 8 kg-cm (6.9 Ib-in). Please use copper conducting wires. The temperature of the
copper conducting wires should be 60/75°C.
(3) Please keep the input cables, the output cables, and the power cable separate form one another.
(4) If the main circuit and the power cable can not be separated from each other, please use a shielded
cable, and ground it at the side of the I/O module. In some cases, the shielded cable is grounded at
the opposite side.
Shilded cable
AC power
suppl
y
Load through which the
alternating current passes
(5) If users wire a module by means of piping, they need to ground the piping correctly.
(6) Please keep 24 V DC input cables separate from 110 V AC input cables and 220 V DC input cables.
(7) If the wiring length is more than 200 meters (686.67 inches), the leakage current will result from
parasitic capacitance, and the system will break down.
 Grounding a cable
Please ground a cable according to the steps below.
(1) Please ground a cable correctly.