Operation and maintenance instructions
Series PRE proportional pressure regulator
Analog /preset version
5000024670
Ver. 01
25
•
Enable pressure regulation check: enables to control the regulated pressure. This
control is similar to the "window" function of the digital output (for more details
regarding this function, refer to paragraph "Digital output"): the regulator checks if the
regulated pressure reaches the pressure target within a certain settable time (Pressure
regulation timeout). This control uses the values "Negative window level" and "Positive
window level" to determine the tolerance range on the regulated pressure.
•
Pressure regulation timeout: serves to set the timeout value for the pressure regulation
check. Refer to the “Enable pressure regulation check” parameter.
•
Pressure regulation check mode: serves to set the event type, warning or alarm, in case
the regulated pressure doesn’t reach the target value. Refer to the “Enable pressure
regulation check” parameter
•
Negative window level: serves to set the lower threshold to define the control window.
Refer to the “Enable pressure regulation check” parameter.
•
Positive window level: serves to set the upper threshold to define the control window.
Refer to the “Enable pressure regulation check” parameter.
•
Pid mode: serves to set the PID gains according to the air volume used. The available
values are: SET1 (SLOW, suitable for small volumes), SET2 (MEDIUM, suitable for
medium volumes) or SET3 (FAST, suitable for big volumes). If necessary, it is possible to
request custom values: in this case the “Pid mode” parameter is fixed to SET4
(CUSTOM) and the user cannot change this value.
12.2.2.
RANGE SETUP
This group contains the parameters to set the regulation ranges. These parameters are available
only for versions with analog input:
•
Minimum regulated e Maximum regulated pressure: may be possible to set a minimum and
a maximum point of the regulated pressure range and is expressed as an absolute value
[bar].
The software
“
UVIX
”
verifies consistency of the two values and ensures that the minimum
point is not greater than the maximum point.
This function enables the user to limit the regulated pressure range with respect to the
nominal range while continuing to use the entire range of the analog input signal on the PRE
series electronic regulator.
Therefore, a minimum and maximum value of the reference signal are associated with the
minimum and maximum point controlled
For example, if the minimum controlled point is set at 3 with a reference signal type 0-10V,
when the reference signal is 0V the regulated pressure moves to 3 bar.
For example, if the maximum controlled point is set at 8 with a reference signal type 0-10V,
when the reference signal is 10V the regulated pressure moves to bar.
This function does not always improve resolution, which may in any event be limited by the
intrinsic characteristics of the PRE series electronic regulator and its internal components.
•
Minimum regulated e Maximum reference signal: may be possible to set a minimum and a
maximum point of the reference signal.
The value that identifies these points varies between the minimum and maximum point of
the reference signal (±10V, 0÷10V or 4÷20mA depending on the code number of the PRE
