KEB COMBIVERT F4-C Applications Manual page 129

Set Value and Ramp Adjustment
Ramp with constant ascent:
Picture 6.4.6.d Acceleration and deceleration times
+f [Hz]
100
50
∆ f
∆ t
0
oP.11
80
100
-f [Hz]
*1 If the value „off" is adjusted in these parameters (acceleration and deceleration times for direction of rotation
reverse), then the values for direction of rotation forward (oP.11 and oP.12) apply.
© KEB Antriebstechnik, 1997
All Rights reserved
It is the standard case and the drive is dimensioned for a fixed acceleration respectively
deceleration torque. The ramp times refer to 100Hz (at ud.11 = 0) and change in
proportion to the frequency change. The times to be adjusted are calculated as follows:
desired ramp time
-------------------------------------------------------
ramp time to be adjusted (oP.11...oP.14)
oP.13 *
∆f
∆ t ∆ t
oP.12
Calculation of acceleration
and deceleration times:
A drive shall accelerate from 10Hz to 70Hz in 5s and decelerate from 50Hz to standstill
in 10s. This shall apply to both directions of rotation.
oP.11 =
oP.12 =
Since these values shall apply to both directions of rotation, oP.13 and oP.14 can
remain in „oFF".
Name: Basis
KEB COMBIVERT F4-C
Functional Description
frequency change(∆f)
= --------------------------------
oP.11 acceleration time
oP.12 deceleration time
oP.13 * 1 acceleration time reverse
oP.14 * 1 deceleration time reverse
∆ f
frequency change
∆ t acceleration time for ∆ n
1
∆ f ∆f
100Hz x real ramp time
oP.11...oP14 =----------------------------------
5s x 100Hz
———————— = 8,33s
(70Hz-10Hz)
10s x 100Hz
———————— = 20s
(50Hz-0Hz)
Date
28.01.98
ANTRIEBSTECHNIK
100 Hz
oP.14 * 1
∆ t
∆f
Chapter Section Page
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6 4 13
6