Chapter 12 Description of Parameter SettingsC2000
12.1-07-3
For example, in equipment with a large inertia flywheel, there is NO need to wait until the
flywheel stops completely after a restart to execute the operation command; therefore, it saves
time.
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.
In PG control mode, the AC motor drive executes the speed tracking function automatically
according to the PG speed when this setting is NOT set to 0.
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.
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).
kW
007 015 022 037 055 075 110 150 185 220 300 370 450 550 750 900
HP 1 2 3 5 7.5 10 15 20 25 30 40 50 60 75 100 120
Delay time (sec.) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
kW 1100 1320 1600 1850 2200 2800 3150 3550 4000 5000
HP 150 175 215 250 300 375 425 475 536 650
Delay time (sec.) 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8
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