Chapter 12 Description of Parameter Settings
MH300
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.
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 “LU”. 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.
Default: 0.5
Settings
0.1–5.0 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 0.75 1.5 2.2 3.7 5.6 7.5 11.0 15.0
HP 1 2 3 5 7.5 10 15 20
Delay time (sec.) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
kW 18.5 22.0 30.0 37.0 45.0 55.0 75.0
HP 25 30 40 50 60 75 100
Delay time (sec.) 1.1 1.2 1.3 1.4 1.5 1.6 1.7
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