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Setup & Operation 3. Environments and Installation

34 VT Rev.1

3.7.2 Noise Countermeasures

To minimize electrical noise conditions, the following items must be observed in the

system’s cable wiring:

- The earth wire of the power supply should be grounded. (Ground resistance: 100 Ω or

less) It is important to ground the frame of Manipulator not only for prevention from

electric shock, but also for reducing the influence of electric noise around the

Manipulator. Therefore, be sure to connect the earth wire (yellow/green) of the

Manipulator’s power cable to the ground terminal of the factory power supply. For

details about the plug and AC power cable, refer to the Setup & Operation 3.6 Power

Supply.

- Do not tap power from a power line that connects to any equipment which may cause

noise.

- Do not run AC power lines and DC power lines in the same wiring duct, and separate

them as far as possible. For example, separate the AC motor power line and the

Manipulator power line as far as possible from the sensor or valve I/O lines; and do not

bundle both sets of wiring with the same cable tie. If more than one duct/cable must

cross each other, they should cross perpendicularly. The preferable example is shown

in the right figure.

AC Line duct

DC line duct

As far as possible

- Wire as short as possible to the I/O connector and EMERGENCY connector. Use a

shielded cable and clamp the shield to the attached connector interior. Make sure to

keep away from the peripheral noise source as far as possible.

- Make sure that the induction elements used to connect to the Manipulator’s I/O (such

as relays and solenoid valves) are noise suppression parts. If an induction element

without protection against noise is used, make sure to connect a noise suppression part

such as a diode located at the induction element in parallel with it. In selecting noise

suppression parts, make sure that they can handle the voltage and current incurred by

the induction load.

- As they are easily influenced by noise, keep cable such as USB, Ethernet, or fieldbus

away from peripheral noise sources.

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