Burkert Type 8611 - Manual (Page 91)

91
FunctionsoftheConfigurationLevel
12.17. VALV - Test function and setting of the control
range
In this menu option, the actuating element can be operated manually, for instance in order to
• test how the process variable responds to the change in manipulated variable or
• to define the permissible control range of the actuating element.
It is recommended to carry out the settings under real process conditions if the process allows it.
12.17.1. control with pi-action structure
(T
n
activated, T
n
> 0), MODE = SCV, 0 - 10, 4 - 20, 2P -T, 3P - T
Setting in the menu:
VALV
055
PRZ * )
The arrow keys are used to display and at the same time to change the
value of the manipulated variable.
Increasing of the manipulated variable of valve 1 (VLV1), bargraph length
increases from left (0 %, 0 V, 4 mA) to right (100 %, 10 V, 20 mA). ** )
Decreasing of the manipulated variable of valve 1 (VLV1), bargraph length
decreases from right to left. ** ) For MODE = 3P -T only valve 2 (VLV2) is
actuated, the bargraph moves from right (0 %) to left (-100 %).
display manipulated variable
(return to the process value display after approx. 2 seconds)
approx.
2 s
display process value
In the case of cascaded control, the two process values are dis-
played alternately.
Displays the value in the buffer
When the ENTER-key is pressed, no value is saved
when returning to the previous display.
Display of maximum manipulated variable as
currently saved.
The ENTER key is pressed to take over the value
from the buffer (as displayed in END) for the
maximum manipulated variable.
Display of minimum manipulated variable as
currently saved.
The ENTER key is pressed to take over the value
from the buffer (as displayed in END) for the
minimum manipulated variable.
Press the ENTER key to take over the current manipulated variable in
the buffer
CODE
* ) The display (PRZ, 0 – 10 or 4 – 20) depends on the actuating element set in the
MODE menu.
150
L/H
055
END
100
MAX
000
MIN
** ) Depending on the selected actuating element (in the MODE menu), the manipulated variable is
increased or decreased by 1%, 0.2 mA or 0.1 V.
Operating range: 0 - 100 %, 4 - 20 mA, or 0 - 10 V.
Table 35: VALV; menu setting for control with PI-action structure (T
N
activated, T
N
> 0)
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Type 8611