4.6
Additional functions
For
special
applications, you
tan
use a variety of additional
functions:
Input integral action component
=
0
Using this function, the integral action component (I-component) of
the PI controller
tan
be reset to zero. You
tan
activate this
additional function via one of the freely assignable digital inputs.
Fur
further
information
about
programming of the freely assignable
inputs see page 81.
This function is e.g. useful for applications where a drive
Comes
to
standstill either after zero
setpoint
and remains in standstill without
the controller being inhibited. By resetting the
I-component, a motor drifting is avoided. If the drive is braked
mechanically with zero setpoint, a resetting of the 1-component
avoids the drive to jerk after releasing the brake.
Output act. value
=
setpoint
The digital function act. value =
setpoint
Shows
that the controller
deviation
(differente
between
setpoint
and act. value) is within a
certain
preset range. The thresholds are considered as a window
which
you
tan
determine
under
C240.
The value to be entered
refers to fdmax (CO1 1).
Code
Name Parameter (Factory setting is printed in bold) Acceptance
C240
Window act.
0.5 % 0.0 %
(0.1
%)
100.0 % ON-LINE
value =
setpoint
In open-loop control the
Signal
“setpoint reached” (Controller
enable/A=E)
is transferred to the function “act. value = setpoint”.
You
tan
assign the function to one of the freely assignable digital
Outputs. Fur
further
information
about
programming of the freely
assignable
Outputs
see page 90.
Output act. value
=
0
The function act. value = 0
Shows
that there is no act. value or the
motor does not run. The range, where the function is
active,
is
fixed in the form of a window of
+
0.5% related to
fdmax.
You
tan
assign the function to one of the freely assignable digital
Outputs and use it for example to reset the I-component of the Pl
controller. Fur
further
information
about
programming of the freely
assignable
Outputs
see page
90.
Act. vaiue display
The
Speed
act. value is displayed
under
code
CO51.
According to the
display of the
setpoint
1
(CO46),
you
tan
select a relative or an
absolute display in Hertz. In open-loop control (without
Speed
feed-
back)
“0”
is shown
under
CO51,
srnce
the act. value input is not used.
Monitor Signals
You
tan
assign the input and output data of the Pl controller to the
freely assignable monitor
Outputs,
if necessary. For closed-loop
Speed
control with frequency
Pilot
control, the controller output is
an approximate value for the motor torque.
l Controller
setpoint
(total
setpoint/total
from
main
setpoint
and
setpoint
2),
l Controller act. value
(Signal
via input
Xl/terminals
3,4
or
XWXS)
l
Controller
output (variable
of
the Pl controller)
For
fur-ther
information
about
programming of the monitor
Outputs
see page 94.
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-
80
lenze
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