Operation and maintenance instructions
Series PRE proportional pressure regulator
External sensor version
5000056022
Ver. 00
24
•
Protection Timeout: sets the inactivity time of the regulator when the target pressure is not
reached before the expiration of the Pressure regulation timeout. During the period of
inactivity, the regulator maintains the current pressure without trying to reach the target
pressure. After this inactivity time has expired, the regulator will try again to reach the
target pressure
•
Dead band: available only with FW version 3.01 or higher. When this parameter is set to a
value higher than 0, the regulator will not make any adjustment as long as the absolute error
of the regulated pressure (difference between the regulated pressure and the target
pressure) remains lower than the set dead band value (red line).
On the other hand, when the absolute error of the regulated pressure exceeds the value of
the set dead band, the regulator returns to carry out normal regulation (green line).
This operating mode makes it possible to avoid continuous adjustments by the regulator,
increasing its life cycle. On the other hand, the achievement of the target pressure according
to the declared performance is not guaranteed: the adjusted pressure error will depend
directly on the dead band value set.
•
Hysteresis value: available only with FW version 3.01 or higher and if the dead band value is
greater than 0. When the absolute error of the adjusted pressure (difference between the
adjusted pressure and the target pressure) remains below the dead band value set for a
sufficient time, the regulated pressure is considered stable and the hysteresis operating mode
(A) is activated. If, on the other hand, the absolute error of the regulated pressure remains
lower than the dead band value set for a NOT sufficient time, the regulated pressure is
deemed NOT stable and the hysteresis operating mode (B) is NOT activated.
When the hysteresis operating mode is active, the regulator will not make any adjustment as
long as the absolute error of the regulated pressure remains less than the value of the sum of
the dead band and hysteresis values set (C).
When the absolute error of the regulated pressure exceeds the value of the sum of the dead
band and hysteresis values set, the hysteresis operating mode is deactivated (D) and therefore
the regulator will not carry out any regulation only if the absolute error of the regulated
pressure becomes lower than the set dead band value (E). To reactivate the hysteresis
operating mode, the absolute error of the regulated pressure must remain below the dead
band value set for a sufficient time.
D
ead
band
D
ead
band
Regulation
Target pressione
No Regulation
Regulation
