Operation and maintenance instructions
Series PME CANopen proportional pressure
regulator
5000054187
Ver. 01
28
•
Pressure regulation timeout: serves to set the timeout value for the pressure regulation check.
Refer to the “Enable pressure regulation check” parameter.
•
Hysteresis value: available only 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.
This operating mode allows to reach the target pressure with sufficient precision, according to
the dead band value set, and to define a wider range, defined by the set hysteresis value, in
which the regulator will not perform any regulation.
Compatibly with the application carried out by the regulator, it is recommended to set:
o
the dead band value as small as possible, in order to obtain a good regulation precision
of the regulated pressure
o
the hysteresis value as large as possible, generally greater than the dead band value, in
order to limit the number of actuations of the regulator.
Dead band
Dead band
Target pressure
No regulation
Pressure not stable:
Regulation
Regulation
Hysteresis
Hysteresis
Pressure stable: No
regulation
(A)
(B)
(C)
(D)
(E)
