Siemens MICROMASTER 420 - Manual (Page 113)

Issue 07/04 3 Functions
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0 113
In order to avoid torque surges at the transitions (constant velocity phase ←→
accelerating / braking phase), additional rounding-off times P1130 – P1133 can be
programmed. This is especially important for applications (e.g.
transporting/pumping liquids or for cranes) which require an especially "soft", jerk-
free acceleration and braking.
If the OFF1 command is initiated while the drive is accelerating, then rounding-off
can be activated or de-activated using parameter P1134 (refer to Fig. 3-43). These
rounding-off times are defined using parameters P1132 and P1133.
f
OFF1
ON
t
Setpoint reached
f
Set
t
f
P1132 > 0
P1133 > 0
P1132
Setpoint reached
Setpoint not reached
f
Set
t
Setpoint not reached
P1134 = 0
P1134 = 1
P1133 P1133 P1132
P1132 P1133 P1133
Fig. 3-43 Rounding off after an OFF1 command
In addition to the rounding-off times, the ramp-function generator can be influenced
using external signals. The ramp-function generator provides the following
functionality using BICO parameters P1140, P1141 and P1142.