Burkert 8756, Operating Instructions Manual

Page: 60 / 88

Type 8756
Setting and operation
english 60
The MFC temporarily stops regulating the flow rate in the pipe.
When the function is completed, the product returns to its pre-
vious operating mode.
If the function is completed successfully, then the optimised
closed-loop control parameters are transferred to the hard
memory of the product.
8.9 Choose the source that gives the
set-point value (MFC)
The process set-point value can be set by different sources. You
can choose which source is active at a time. The source for the
set-point value can be changed during operation.
If you change the source for the set-point value, then the operat-
ing mode of the MFC is changed.
To change the source for the set-point value, change the setting
of the parameter
Set-point value source with the Bürkert Com-
municator software. To connect the product to the Bürkert Com-
municator software, refer to chapter:
Connect the product to the
Bürkert Communicator software [
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53]
On a büS/CANopen product variant you can alternatively change
the related object. Refer to the related procedure in the product-
specific help in the documentation of the initiation files. Download
the initiation files and the related documentation at
country.burkert.com .
The setting of the parameter Set-point value source is
kept after a restart, except when the product performs the
function
Analyze system .
The possible choices for the parameter Set-point value source
are:
▪ product variant büS/CANopen: Automatic : the set-point value
is set via the fieldbus.
▪ product variant Analogue: Analog set-point value : the setpoint
value is set via the analogue input.
▪ Manual set-point value : to manually give in a set-point value
for testing purposes or to make sure that the set-point value is
not overwritten by other fieldbus participants.
▪ Stored set-point value : to use a fixed set-point value (w). If the
product is restarted, then the fixed set-point value remains act-
ive.
▪ Open-loop control mode : to directly set the set-point position
(y) to the actuator. The value that is given in the menu Actuator
> Parameter > Actuating variable is the setpoint position (y)
that is used. A restart of the product sets the set-point position
(y) to zero.
▪ Analyze system : the product operates in the normal operating
mode, but according to a predefined chronological sequence
with set-point values. Use the resulting diagram in combination
with the graphical representation of process values to analyse
the system with the Bürkert Communicator software.