LAH-80 Series Technical Document
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4-7 Wiring
The control unit is a control device that processes signals of several mV or less. Observe the following to
perform wiring.
(1) Use a twisted pair shielded cable with the required number of conductors as the I/O signal line. If two or
more control units are used, use a separate cable for each of the control units. The wiring length (cable
extension) should be as short as possible.
A guideline of the wiring length is as follows.
1. Command I/O signal line: 3m or shorter
(2) The ground line should be line diameter of 0.75mm
2
or more with one-point grounding. Grounding of
Class 3 (grounding resistance of 100
Ω
or less) or greater is recommended.
(3) The wiring length should be as short as possible.
(4) To prevent malfunction due to noise, take the following measures.
◇
Place the noise filter and control unit as close as possible.
◇
Insert a surge absorber circuit to a coil such as a relay, magnetic contactor, and solenoid.
◇
Separate the power line (strong electric circuits such as AC lines and motor lines) and the signal line
30mm or more. Do not pass them through the same duct or bind them together.
◇
If there is any source of high-frequency noises such as electric welders and electrical discharge
machines, even if not connected to the same power supply, place a noise filter in the power supply
and input circuit.
◇
A switching amplifier is used in the control unit, which may generate noises on the signal line. When
wiring especially the analog input, make sure that the termination is not open.
(5) Measure against radio interference
The control unit is industrial equipment, so it has no measure against radio interference. Therefore, if it
is used near private residence or radio interference becomes an issue, provide a line filter to the input of
the power supply line.
(6) The conductor of the cable used as a signal line is thin. Be careful not to bend or pull it forcefully.
◆
Perform wiring carefully based on the connection diagram.
Any wrong wiring or poor connection may cause runaway or
malfunction of the actuator, burning, or injury.
◆
Connect the input of the control unit, signal lines, and sensor
driving voltage based on the specifications and connection
diagram. Applying a voltage exceeding the operating range
or making wrong wiring may cause malfunction, failure,
burning, or injury.
◆
The wiring length should be as short as possible.
◆
Provide measures against noise. Failure to do so may cause
malfunction.
◆
Check the wiring before power supply is active. Wrong wiring
may cause runaway or malfunction of the actuator.
◆
Do not bend or pull the line forcefully. It may cause
malfunction.
CAUTION
