11.4 Option
11-59
Chapter 11 SELECTING PERIPHERAL EQUIPMENT
[6] Output circuit filter (OFL)
Insert an OFL in the inverter power output circuit to:
• Suppress the surge voltage at motor terminal
This protects the motor from insulation damage caused by the application of high surge voltage from
the 400 V class series of inverters.
• Suppress leakage current from the inverter output lines
This reduces the leakage current when the motor is connected by long power feed lines. (Keep the length
of the power feed line of 400 m or less.)
• Minimize radiation and/or induction noise issued from the inverter output lines
An OFL is an effective noise suppression device for long wiring applications at plants.
Figure 11.4-21 External View of Output Circuit Filter (OFL) and Connection Example
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