Fuji Electric frenic mini series, Руководство пользователя

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9-22
In the above expressions, it is assumed that each function code expresses its data.
Example: Setting the bias, gain and its reference point when analog input range from 1 to 5
VDC is selected for the frequency command 1
(Point A)
If the analog input is at 1 V, the set frequency is 0 Hz. Therefore, the bias is 0% (F18 = 0).
Since 1 V is the bias reference point and it is equal to 10% of 10 V, then the bias reference
point should be 10% (C50 = 10).
(Point B)
If the analog input is at 5 V, the set frequency comes to be the maximum value. Therefore,
the gain is 100% (C32 = 100). Since 5 V is the gain reference point and it is equal to 50% of
10 V, then the gain reference point should be 50% (C34 = 50).
When using the function codes for setting a stand alone gain or bias without
changing any reference points, the setting procedure for the function codes is the
same as that of FUJI's conventional inverter models.
F20 DC Braking (Starting frequency)
F21 DC Braking (Braking level)
F22 DC Braking (Braking time)
These function codes enable the DC brake to prevent the motor from coasting due to its
inertia while it is decelerating to a stop. Set function codes F20 for the starting frequency,
F21 for the braking level, and F22 for the braking time as follows.
Starting frequency (F20)
Set the frequency with which to start DC braking.
- Data setting range: 0.0 to 60.0 (Hz)
Set function code F20 to a frequency that approximately equals the slip-
compensated frequency of the motor. If you set it to an extremely high frequency,
the inverter will be unstable, and in some cases the overvoltage protective function
may work.
Braking level (F21)
Set the output current level to be applied when DC braking is activated. Set the function
code data, assuming the rated output current of the inverter as 100% with 1-% resolution.
- Data setting range: 0 to 100%
Braking period (F22)
Set the braking period during which DC braking is activated.
- Data setting range: 0.01 to 30.00 (sec.)
(Note that setting 0.00 disables DC braking.)
Time
Starting frequency
Frequency
Motor speed
(FWD)
(RUN)
In running
Braking period