Chapter 12 Description of Parameter SettingsCFP2000
12.1-07-3
Setting 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.
This function is only valid when the RUN command is enabled.
Allowed Power Loss Duration
Default: 2.0
Settings 0.0–20.0 sec.
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.
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, the operation mode set in Pr.07-06 does
not execute.
Base Block Time
Default: Depending
on the model power
Settings 0.0–5.0 sec. (Depending on the model power)
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 regeneration voltage at the
output side to decrease to 0V 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).
kW 007 015 022 037 040 055 075 110 150
HP 1 2 3 5 5.5 7.5 10 15 20
Delay time (sec.) 0.3 0.4 0.5 0.6 0.7 0.7 0.8 0.9 1
kW 185 220 300 370 450 550 750 900
HP 25 30 40 50 60 75 100 125
Delay time (sec.) 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
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