■Control panel designed in consideration of possible influences of noise

Inverters produce high-frequency noise. To avoid influences of noise, measures must be taken in designing a control panel. Here are some examples of measures against noise.

Separately install the wires of the main circuit and those of the control circuit. Do not install their wires in the same duct or in parallel with each other, and do not bind them together.

Use shielded wires or twisted wires for the control circuit.

Separate the input wires (on power supply side) of the main circuit from the output wires (on motor side). Do not install them in the same duct or in parallel with each other, and do not bind them together.

Be sure to ground the grounding terminal (G/E) of the inverter.

Be sure to connect a surge suppressor to every electromagnetic contactor and every relay installed near the inverter.

Install noise filters, as required.

■Notes on the installation of two or more inverters in a single cabinet

When installing two or more inverters in a single cabinet, take the following precautions:

Leave a clearance of at least 10 cm between inverters placed side by side.

Leave a clearance of at least 20 cm between inverters placed one above another.

Install a deflector, etc., to prevent the upper inverter from being affected by heat produced and being exhausted by the lower one.

Inverter

Cooling fun

Deflector

Inverter

Installation of Cooling fun

A-18

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Toshiba VF-A7 instruction manual