18
Wiring
Wiring Notes
Background electromagnetic noise that has no effect on analog equipment may
cause digital equipment to malfunction or fail. To prevent adverse effects from
electro-magnetic (EM) interference, carefully follow the wiring instructions below:
1. Power Source
1) If there is EM noise from the power source, a filter should be used. To prevent
interference, do not bundle the EM filter's power source input and output lines
together.
2) Although there is a built-in fuse in the controller, there is no power switch. It is
required that a power switch be installed on an external circuit near the main
unit. Do not install a power switch between the EM filter and the valve, as this
will reduce the effectiveness of the filter.
172-65185A-08 (MC-COSR Multi-control Valve) 20 Nov 2014
EM Signal Filter
Power Switch
Drive
Section
Terminal
Block
Power Supply
3) A power cable is not included with the unit. See “Wiring Instructions”.
Ground
4) Install an overcurrent protection device on the power supply lines (both poles)
to prevent overcurrent.
Recommended rating of the device: 250V/2A, Delay type
2. Input/Output Signal Lines for Valve Operation
1) Use shielded cables for the I/O signal lines.
Connect the shielded cables to the receiver's shield terminal.
2) Separate the I/O signal cables from power cables, drive cables, and EM noise-
generating equipment. Do not insert I/O signal cables in common piping or
ducts with aforementioned cables.
3. Ground
1) Be sure to ground the MC-COSR and the controller.
2) Use a one-point ground at the same point as the ground for the controller to be
used with the valve. Do not use extension wiring. Failure to ground the valve as
specified may cause it to malfunction.
3) For the ground terminal, use a flexible copper wire, at least 2 mm
2
(0.003 in
2
).
Ground with a ground resistance of 100
or less (Class 3 ground).
Drive
Section
Terminal
Block
Power Supply
Controller
Terminal
Block
Shield
Shielded Cable
Power Supply
Drive
Section
Terminal
Block
Controller
Terminal
Block
Ground
