Chapter 12 Descriptions of Parameter SettingsMS300
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2: Frequency tracking starts from the minimum output frequency and accelerates to the master
Frequency command after the drive output frequency and motor rotator speed are synchronous.
Use this setting when there is little inertia and large resistance.
Determines the maximum time of allowable power loss. If the duration of a power loss exceeds
this parameter setting, the AC motor drive stops output after the power recovers.
Pr.07-06 is valid when the maximum allowable power loss time is ≤ 20 seconds and the AC
motor drive displays “Lv”. If the AC motor drive is powered off due to overload, even if the
maximum allowable power loss time is ≤ 20 seconds, Pr.07-06 is invalid after the power
recovers.
When momentary power loss is detected, the AC motor drive blocks its output and then waits for
a specified period of time (determined by Pr.07-08, called Base Block Time) before resuming
operation. Set this parameter to the time that allows the residual voltage at the output side to
decrease to 0 V before activating the drive again.
This parameter is not only for the B.B. time, but also is the re-start delay time after free run.
The RUN command during a free run operation is memorized, and runs or stops with the last
frequency command after the delay time.
This delay time is only applicable in “Re-start after coast to stop” status, and does not limit ramp
to stop. The coast to stop can be caused by various control command source, or by errors.
Following table is the recommended setting for re-start delay time of each model power. You
must set Pr.07-08 according to this table (the default of each model power is based on this table
as well).
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