Panel designing taking into consideration the effects of noise
The inverter generates high frequency noise. When designing the control panel setup, consideration must be given to
that noise. Examples of measures are given below.
• Wire so that the main circuit wires and the control circuit wires are separated. Do not place them in the same
conduit, do not run them parallel, and do not bundle them.
• Provide shielding and twisted wire for control circuit wiring.
• Separate the input (power) and output (motor) wires of the main circuit. Do not place them in the same conduit, do
not run them parallel, and do not bundle them.
• Ground the inverter ground terminals (
• Install surge suppressor on any magnetic contactor and relay coils used around the inverter.
• Install noise filters if necessary.
Installing more than one unit in a cabinet
If you are installing two or more inverters in one cabinet, pay attention to the following.
• Inverters may be installed side by side with each other with no space left between them.
• When installing inverters side by side, remove the protective cover on the top surface of each inverter.
The output current may need to be reduced, depending on the ambient temperature and the carrier frequency, so
see "How to install" in this section.
• Ensure a space of at least 20cm on the top and bottom of the inverters.
• Install an air deflecting plate so that the heat rising up from the inverter on the bottom does not affect the inverter on
Air deflecting plate