Festo — MSE6-C2M — 2022-08b
Functions
23
Em.2:
pressure P2
Em.3.8-3.11:
module status
0:
USER_
RISE
1:
USER_
PON
Am.0.3-0.4:
target
pressure
user selection
t
Am.0.1:
control of
auto user
Auto = 1
User = 0
4:
USER_
VAR
Am.2:
target pressure user
2nd value
Pm.28.4-28.6:
target
pressure
rise
limitation
Pm.28.2:
target
pressure
power on
0:
Power on
target pressure
6 bar = 1
10 bar = 0
10 bar
Pm.28.4-28.6:
target
pressure
rise
limitation
Am.2:
target pressure user
1st value
0:
USER_
RISE
4:
USER_
VAR
3:
target pressure
user variable
Fig. 12: User controlled pressure control and blocking operation
5.1.5.3
Automatic pressure control and locking operation, AUTO
The automatic pressure regulation and blocking function is activated when the auto user output
control Am.0.1 has the value 1, active.
The automatic pressure control and blocking function starts with each activation in the module state
AUTO_NORMAL, Em.3.8-3.11 = 8. In this state, the blocking valve is open and the pressure control
valve regulates to the setpoint pressure auto normal parameter value, Pm.21-22. At the same time,
the Q_low-Timer function starts monitoring to check whether the flow rate value falls below the auto
controller flow rate critical limit parameter value, Pm.19-20. If the value falls below the limit value,
the AUTO_WAIT state, Em.3.8-3.11 = 9, changes and the duration of the state is monitored by the
Q_low-Timer. If the limit value is undershot by the time limit set with the auto controller delay time
parameter, Q_low-Timer, it switches to the state AUTO_HOLD, Em.3.8-3.11 = 10. In this state, if the
shut-off valve is still open, the setpoint pressure is set to auto normal. If the flow rate reaches or
exceeds the auto controller flow rate critical limit value during the AUTO_NORMAL, AUTO_WAIT and
AUTO_HOLD states, the flow rate immediately returns to the AUTO_NORMAL state, Em.3.8-3.11 = 8.
To switch the target pressure from auto normal to auto standby in the AUTO_HOLD state, the auto
enable output control, Am.0.5 = 1, must be activated. This can be done permanently or by the user
depending on the system, e.g. if automatic switching is not permitted due to the situation.
