KEB COMBIVERT F5 BASIC Applications Manual page 163

Set Value and Ramp Adjustment
6.4.7 Ramp Generator
Fig. 6.4.7 Acceleration and deceleration times
+f [Hz]
100
50
∆ f
∆ t
0
oP.28
80
100
-f [Hz]
*1 If the value „=For" is adjusted in these parameters (acceleration and deceleration times for rotation
direction reverse), then the values for rotation direction forward (oP.28 and oP.30) are valid.
*2 If the value „=Acc" is adjusted, then the value for acceleration forward (oP.28) is valid.
ACC/DEC time factor (oP.62)
Example
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All rights reserved
The ramp generator assigns an adjustable time to a frequency change, during this
time the change stall take place. The acceleration time (for pos. frequency changes)
and deceleration time (for neg. frequency changes) can be adjusted separately for
both directions of rotation. To enable jerk-free acceleration and deceleration, so-called
S-curves can be adjusted in addition to it.
The adjusted ramp times refer to 100Hz (at ud.2=0). The ramp times changes in
proportion to the frequency change. The times to be adjusted are calculated as follows:
desired ramp time
–––––––––––––––––––––––––––––––––
ramp time to be adjusted (oP.28...oP.31)
∆ f
∆ t ∆ t
oP.29
The time factor extends the standard ramp time (oP.28...31) by the adjusted value.
The S-curve time do not change.
Value Ramp time
0 adjusted value x 1
1 adjusted value x 2
2 adjusted value x 4
3 adjusted value x 8
4 adjusted value x 16
Calculation of the
acceleration and
deceleration times:
A drive shall accelerate from 10Hz to 70Hz in 5s.
oP.28 =
Name: Basis
KEB COMBIVERT F5-G / B
Functional Description
= –––––––––––––––––––
oP.28
oP.29 * 1
oP.30 * 2
1
oP.31 *
∆ f
∆ t
oP.30
∆ f
100Hz x real ramp time
oP.28...oP.31 = ––––––––––––––––––––
5s x 100Hz
———————— = 8,33s
(70Hz-10Hz)
Date
06.02.02
frequency change (∆f)
100 Hz (dep. on ud.2)
Acceleration time forward
Acceleration time reverse
Deceleration time forward
Deceleration reverse
Frequency change
Acceleration time for ∆f
oP.31
∆ t
∆ f
∆f
Chapter Section Page
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6
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