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6.5.4 Basic connection diagram
Refer to "6.1.4 Installing internal options (OPC-VG1-)" before connecting the cables.
Incorrect cabling may cause a disaster such as electrical shock or fire. Only a qualified person should perform
cabling. Before touching the power supply circuit (e.g., for cabling after power on), be sure to turn off (i.e.,
open) the circuit breaker to prevent electrical shock.
Note that the smoothing capacitor is charged after turning off (i.e., opening) the circuit breaker and touching it
causes an electrical shock. Ensure that the charge lamp (CHARGE) of the inverter has gone off and that the DC
voltage of the inverter has lowered to a safety level using a tester.
Since the SX bus is powered from the PLC power supply module, ensure that the MICREX-SX and inverter
power supplies are off when installing or removing this option.
Do not use the product that is damaged or lacking parts to prevent an injury or damage.
Incorrect handling in installation/removal jobs could result in a broken product.
The basic connection diagram is shown on the next page. When connecting the cables, observe the
following precautions.
[Notes on connection]
(1) Be sure to use SX-bus dedicated cables.
Model: NP1C-P3 (0.3 m) to NP1C-25 (25 m)
Refer to the manual of MICREX-SX (hardware) for the cable specifications.
(2) Before proceeding with connection, make sure that both the MICREX-SX and the inverter are
powered OFF.
(3) Put the terminating connectors (that come with the CPU module of the MICREX-SX) in both ends
of the SX bus.
(4) To prevent an error due to noises, keep the SX bus cable apart from the main circuit cables of the
inverter and other power cables as apart as possible (30 cm or more)
and never put it in the same
duct.
(5) One end of the SX-bus cable should be connected with the OUT connector on the base board, and
the other end, with the IN connector. The OUT-OUT or IN-IN connection does not enable
communication and the system does not operate. Route SX-bus cables so that the bending radius is
at least 50 mm.
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