Issue 10/06
3.12.2
Ramp-function generator (RFG)
Parameter range:
Warnings
Faults
Function chart number:
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. 3-62).
Where the rounding times are increased to be greater than the ramp period then the ramp
period is determined by the following equations:
Fig. 3-62
MICROMASTER 440
Operating Instructions
6SE6400-5AW00-0BP0
P1120, P1121
r1119, r1170
P1130 – P1142
-
-
FP5000, FP5300
f
f
max
f
2
f
1
P1120
f
f
max
f
2
f
1
P1130
P1131
t
up
f -
f
2
1
for
P1082
1
=
t
up
2
f -
f
2
1
for
P1082
=
t
down
(
⎛
⋅
2
f
⎜
2
=
t
up
⎜
f
⎝
max
(
⎛
2
⋅
f
⎜
=
t
down
⎜
f
⎝
max
Ramp-function generator
P1121
P1132
1
⋅
P1120
≥
(
P1130
+
P1131)
2
f -
f
2
1
(
P1130
+
P1131)
+
⋅
P1082
1
⋅
≥
+
P1121
(
P1132
P1133)
2
1
f -
f
2
1
+
+
(
P1132
P1133)
2
P1082
(
)
)
⎞
2
−
⋅
⋅
⎛
P
1120
P
1130
f
⎟
1
⋅
⎜ ⎜
+
1
(
)
⎟
⋅
P
1130
+
P
1131
⎝
⎠
(
)
)
⎞
2
⎛
−
⋅
P
1120
⋅
P
1132
f
⎟
2
1
⎜ ⎜
⋅
+
1
(
)
⎟
⋅
+
P
1132
P
1133
⎝
⎠
3 Functions
t
P1133
t
t
down
P1120
⋅
P1121
⎞
P
1131
⎟ ⎟
P
1130
⎠
⎞
P
1133
⎟ ⎟
P
1132
⎠
183