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Description of the Software Modules and Parameters
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
403
4
dV
Scurve
= T
Scurve
/ T
Ramp-up
* 100 % = 200 ms / 800 ms * 100 % = 25 %
dV
Scurve
> dV
total
maximum acceleration is
not
achieved.
only "S-Curve phase" present
Now determine the resulting ramp-up time:
t
Scurve
=
(dV
total
/ dV
Scurve
) * 2 * T
Scurve
=
(12.5 % / 25 %) * 2 * 200 ms = 283 ms
t
total
= t
Scurve
4.6.1.1 Optional interpolation of the ramp function generator input set value
A cyclical and synchronous transferred speed set value which is mapped to the input set
value (
), can be interpolated optionally to the ramp function genera-
tor (RFG) cycle (
Active cycle time ramp generator). The speed profile is calcu-
lated by the controller and is transferred in the adjusted set value cycle. The interpolation
is switched on by setting bit 11 in
Mode. The ramp function generator is usually
switched off at active interpolation.
Here, is recommended to configure the set value processing of the ramp function gener-
ator in the fieldbus task. This is made by
Mode bit 16 = 1 and after this setting
was made the controller must be restarted.
The controller interpolates from set value cycle to the ramp function generator cycle
(
). For this the set value cycle in parameter
must be set and the in-
terpolation must be activated. Both must take place before enabling the operation mode
speed control or speed setting 1. A change at active ramp function generator is invalid!
The ramp function generator interpolates if the set value cycle time (
) is greater
than the active cycle time of the ramp function generator (
)
Example 1:
Fieldbus cycle = 1 ms, set value cycle = 6 ms und ramp function generator cycle = 1 ms
A new calculated set value is transferred only in every sixth fieldbus cycle
The ramp function can be configured in the fieldbus task as well as in the RT1
task.
Fieldbus cycle time = 1 ms and
Division ratio fieldbus
task = 1
Virt. master set value cycle time = Interpolation interval = 6 ms
6 ms / 1 ms - 1 = 5
Interpolator generates 5 interpolated set values in the ramp function
generator.
Example 2:
Fieldbus cycle = set value cycle = 2 ms and ramp function generator cycle = 1 ms
A new set value is transferred in each fieldbus cycle.
The ramp function can be configured in the fieldbus task as well as in the RT1
task.
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