KEB COMBIVERT F5-H - Ramp with Constant Time

Page 7.4 - 20 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Setpoint, rotation- and ramp setting
Parameter Value range Factory setting Notice
oP.71: s-curve up time acc.
rev.
-2: forward parameter = oP.70
-1: lower s-curve X = oP.33
0: off
0.01 s...5 s
oP.72: s-curve up time dec.
for.
-2: acceleration parameter = oP.70
-1: lower s-curve X = oP.34
0: off
0.01 s...5 s
oP.73: s-curve up time dec.
rev.
-2: acceleration parameter = oP.71
-1: lower s-curve X = oP.35
0: off
0.01 s...5 s
7.4.8.3 Ramp with constant time
At the ramp with constant time oP.28… oP31 adjusts the time the inverter accelerates from speed 0 to the ac-
tual setpoint (ramp mode = 1) and/or decelerates from the last setpoint to speed 0 (ramp mode = 2). Then the
acceleration / deceleration time at start/stop operation is independent from the setpoint. In this operating mode
s-curves are not possible.
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.
Acceleration Deceleration
time
Setpoint
time
oP.28
oP.30
oP.27 acceleration deceleration mode
= 1, 4, 16, 64: const. time / actual setpoint
oP.27 acceleration deceleration mode
= 2, 8, 332, 128: const. time / last setpoint
Setpoint 1
Display ramp
output 1
Display ramp
output 2
Display ramp
output 3
Setpoint 2 Setpoint 3
Acceleration at ramp mode =
constant time / actual setpoint
(value 1, 4, 16, 64) is:
Deceleration at ramp mode =
constant time / last setpoint
(value 2, 8, 32, 128) is:
Δn

Δt
actual set value

acceleration time (oP.30/oP.31)
Δn

Δt
last setpoint

deceleration time (oP.30/oP.31)
= =