Fuji Electric FRENIC-HVAC User Manual page 372

Restart mode after momentary power failure (Basic operation: Auto search enabled)

Auto search for idling motor speed will become unsuccessful if it is done while the motor
retains residual voltage. It is, therefore, necessary to leave the motor for the time (auto search
delay time) enough to discharge the residual voltage. The delay time is specified by H46
(Starting Mode (Auto search delay time 2)).
The inverter will not start unless the time specified by H46 has elapsed, even if the starting
conditions are satisfied. ( For details, refer to H09.)
• To use auto search for idling motor speed, it is necessary to tune the inverter
beforehand.
• When the estimated speed exceeds the maximum frequency or the upper limit
frequency, the inverter disables auto search and starts running the motor with the
maximum frequency or the upper limit frequency, whichever is lower.
• During auto search, if an overcurrent or overvoltage trip occurs, the inverter
restarts the suspended auto search.
• Perform auto search at 60 Hz or below.
• Note that auto search may not fully provide the performance depending on load
conditions, motor parameters, wiring length, and other external factors.
• When the inverter is equipped with any of output circuit filters OFL--4 in
the secondary lines, it cannot perform auto search. Use the filter OFL--4A
instead.
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