Chapter 5 Parameter Introductions
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58 ), and calculates length according to PG Pulse Range (P4.16) and Shaft perimeter
(P8.04).
Calculated length ＝ Number of count pulses /PG Pulse Range (P4.16) *shaft
perimeter (P8.04)
◆The calculated length can be corrected through P8.02 (Rate of length) and P8.03
(correction coefficient of length), and the actual length is the corrected length.
Actual length ＝calculated length *Rate of length/ correcting coefficient of length
◆If the actual length (P8.01) is less than and nearly to the preset length (P8.00), the ac
drive will decelerate and run at low speed automatically. When actual length (P8.01) ≥
preset length (P8.00), the operating frequency will be zero, and the ac drive will stop
according to the stop mode. When the ac drive restarts, it needs to clear the actual
length or increase the preset length. The preset length (P8.00) must be larger than the
actual length (P8.01)), otherwise, the ac drive will not start. As shown in Fig.5-8-1.
Time(S)
Operation Freq.(Hz)
Run command
Time(S)
Actual Length
Preset length
Actual Length
clearing Command
Operation according to
inverter's preset
Dec time
Fig. 5-8-1 Fixed length control diagram
We can adjust the initial deceleration time of the ac drive through setting the
deceleration point, reducing the deceleration point appropriately when the ac motor
inertia is large, thus the motor will decelerate ahead of schedule.
At the same time by setting the slide (P0.09 lower frequency limitation) to adjust the
frequency and deviation (P8.06). When the ac motor is overshoot, set P8.06 negative;
and if it cannot reach the setting then set P8.06 positive. Now suppose that one motor is
overshoot, after doing the corresponding parameter settings, the running process is as
shown in Fig.5-8-2.
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