2 ramp-function generator (rfg), With ro undin g – Siemens MICROMASTER 420 User Manual
Page 112
3 Functions
Issue 07/04
MICROMASTER 420 Operating Instructions
112
6SE6400-5AA00-0BP0
3.12.2
Ramp-function generator (RFG)
Parameter range:
P1120, P1121
r1119, r1170
P1130 – P1142
Warnings -
Faults -
Function chart number:
FP5000, FP5300
The ramp-function generator is used to limit the acceleration when the setpoint
changes according to a step function. This therefore helps to reduce the stressing
on the mechanical system of the machine. An acceleration ramp and a braking
ramp can be set independently of one another using the ramp-up time P1120 and
the ramp-down time P1121. This allows a controlled transition when the setpoint is
changed (refer to Fig. 3-42).
Without roun
ding
t
f
f
max
P1120
P1121
f
2
f
1
f
f
max
P1133
P1132
P1131
P1130
t
f
2
f
1
t
up
t
down
With ro
undin
g
for
P1131)
P1130
(
2
1
P1120
P1082
f
-
f
1
2
+
≥
⋅
P1120
P1082
f
-
f
P1131)
P1130
(
2
1
t
1
2
up
⋅
+
+
=
for
P1133)
P1132
(
2
1
P1121
P1082
f
-
f
1
2
+
≥
⋅
P1121
P1082
f
-
f
P1133)
P1132
(
2
1
t
1
2
down
⋅
+
+
=
Fig. 3-42
Ramp-function generator