Fuji Electric FRENIC MEGA G2 Series - 11.14 Output Circuit Filters (OFL)

11.14 Output Circuit Filters (OFL)
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11.14 Output Circuit Filters (OFL)
Connect an OFL to the inverter power output side to:
• Suppress the surge voltage at motor terminals
This protects the motor from insulation damage caused by the application of high voltage surge currents from
400V series inverters.
• Suppress leakage current from output lines
This reduces leakage current from long power feed lines. (The maximum wire length must be 400 m.)
• Minimize radiation and induction noise from output lines
An OFL effectively suppresses noise from long lines such as wiring at plants.
Output circuit filter (OFL)
Inverter
M
Motor
W
V
U
W
V
U
Z
Y
X
Fig. 11.14-1 External view and connection example for output circuit filter (OFL)