Ramp-Function Generator (Rfg) - Siemens MICROMASTER 440 Operating Instructions Manual

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