Limiter (Op.40 / Op.41); Ramp With Constant Time; Ramp With Constant Time - KEB COMBIVERT F5 MULTI Applications Manual

Functional Desription
6.4.8 Limiter
(oP.40 / oP.41)
Output limit forward (oP.40)
Output limit reverse (oP.41)
6.4.9 Ramp with constant
time
Chapter Section Page
6 4 16
The setpoint value to the ramp generator can be changed for example by slip
compensation. Before the setpoint value triggers the modulator, it is again
limited. The limiter defines the maximum output frequency and can be
programmed differently in all sets.
If the frequency rises above the adjusted value, the error ÑE.OSì is triggered. At
oP.41 = Ñ=Forì the value applies to clockwise rotation oP.40.
Setting range oP.40:
Setting range oP.41:=For; 0...4000 min
At the ramp with constant time the acceleration and deceleration times adjusted
with oP.28...oP.31 always equal the real ramp times, independent of the set value.
In this operating mode S-curves are not possible. For acceleration the actual set
value is always used as reference value, for deceleration the last set values is
always used.
Here a little example for the use of ramps with constant time:
Two conveyor belts run with different speeds. Both of them receive the Stop-
command at the same time. The belts reduce the speed in proportion to the adjusted
time and come to a standstill simultaneously.
Fig. 6.4.9.a Forward acceleration with constant ramp time
n _ s o l l f_soll
f_ist
n _ i s t
t_rampe
Date Name: Basis
12.05.04 KEB COMBIVERT F5-M / S
Setpoint- and Ramp Adjustment
-1
0...4000 min
-1
t_rampe t_rampe
©
-1
Default: 4000 min
Default: =For
t_rampe
t_rampe t
KEB Antriebstechnik, 2002
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