6
6.1
Operating mode, speed/torque setpoint (P0700 = 1)
6-334
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
6.1.3
Ramp–function generator
The ramp–function generator is used to limit the acceleration when the
analog setpoint voltage has step changes.
Various parameter set–dependent ramps can be entered for ramp–up
and ramp–down.
The following parameters are available for the ramp–function generator:
Table 6-1
Parameter overview for the ramp–function generator
Parameters
No.
Name
Min.
Standard
Max.
Units
Effective
0616:8
from SW 2.4
1256:8
Ramp–function generator, ramp–up
time (ARM)
(SRM, SLM)
0.0
2.0
0.0
600.0
s
Immedi-
ately
The setpoint is increased from zero up to the maximum permissible actual speed within
this time.
Max. permissible actual speed for synchronous motors: Minimum from 1.1
P1400
and P1147 (from SW 7.1 1.05
P1400 and P1147 with ”SIMODRIVE 611 universal
HR”, resolver)
Max. permissible actual speed for induction motors: Minimum from P1146 and P1147
Max. permissible actual speed for linear motors: from P1147
0617:8
from SW 2.4
1257:8
Ramp–function generator, ramp–
down time (ARM)
(SRM, SLM)
0.0
2.0
0.0
600.0
s
Immedi-
ately
The setpoint is changed from the maximum permissible actual speed to zero within this
time.
Max. permissible actual speed for synchronous motors: Minimum from 1.2
P1400
and P1147
Max. permissible actual speed for induction motors: Minimum from P1146 and P1147
1012.0
Ramp–function generator tracking
–
–
–
hex
Immedi-
ately
The ramp–function generator tracking can be activated/de–activated using P1012 bit 0.
= 1
Ramp–function generator tracking active (standard)
= 0
Not active
t
Ramp–function
generator
output
2)
Speed actual value
Without RFG tracking
Speed
setpoint
1
1)
With RFG tracking
Speed actual value
Ramp–function
generator output
with tracking
2)
t
t
1
t
2
t
1
t
2
The drive continues to accelerate
between t
1
and t
2
, although the speed
setpoint (e.g. setpoint 0) is less than the
speed actual value.
The ramp–function generator output
is prevented from leading the speed
actual value so that t
1
and t
2
almost
merge.
n
n
Note:
1) For example, from the PROFIBUS control word NSOLL or P0641 (fixed speed
setpoint).
2) Ramp–function generator output corresponds to the speed setpoint trace parameter.
Speed
setpoint
1
1)
General
information
Parameter
overview
6 Description of the Functions
01.99
06.04
