KEB COMBIVERT F5 BASIC - Page 163

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413
KEB COMBIVERT F5-G / B
Name: Basis
06.02.02
6
© KEB Antriebstechnik, 2002
All rights reserved
Functional DescriptionSet Value and Ramp Adjustment
Section PageDate Chapter
100
80
0
∆ f
100
50
∆ t
oP.28
∆f
∆ t
oP.29
∆ t
∆ f ∆f
oP.30
∆ t
oP.31
+f [Hz]
-f [Hz]
Rotation direction
clockwise
Rotation direction
counter-clockwise
oP.28 Acceleration time forward
oP.29 *
1
Acceleration time reverse
oP.30 *
2
Deceleration time forward
oP.31 *
1
Deceleration reverse
∆ f Frequency change
∆ t Acceleration time for ∆f
Fig. 6.4.7 Acceleration and deceleration times
*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.
6.4.7 Ramp Generator
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 frequency change (∆f)
––––––––––––––––––––––––––––––––– = –––––––––––––––––––
ramp time to be adjusted (oP.28...oP.31) 100 Hz (dep. on ud.2)
Calculation of the
acceleration and
deceleration times:
5s x 100Hz
oP.28 = ———————— = 8,33s
(70Hz-10Hz)
100Hz x real ramp time
oP.28...oP.31 = ––––––––––––––––––––
∆f
A drive shall accelerate from 10Hz to 70Hz in 5s.Example
ACC/DEC time factor (oP.62)
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