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8.7.61 Min. pressure (4.4.2)
Fig. 112 Min. pressure
Description
The outlet pressure will be monitored if the application is pressure
boosting. In all other applications, the system pressure will be
monitored. CU 352 will react if the pressure becomes lower than
a set minimum level for an adjustable time.
The minimum pressure can be monitored if a fault indication is
required in situations where the outlet pressure becomes lower
than the set minimum pressure.
You can set whether the indication is to be just a warning or an
alarm stopping the pumps. This may be desirable if the system is
used for an irrigation system where a very low outlet pressure
may be due to pipe fracture and thus an extraordinarily high
consumption and a very low counterpressure. In such situations,
it is desirable that the system stops and indicates alarm. This
situation requires manual resetting of alarms.
You can set a startup delay ensuring that the system can build up
pressure before the function is enabled. You can also set a time
delay, that is for how long time the outlet pressure may be lower
than the set minimum pressure before the alarm is activated.
Setting range
•
Minimum pressure level within the range of the primary
sensor.
•
Activation of stop when the pressure falls below the minimum
pressure.
•
Time delay of function at start-up.
•
Time delay of function during operation.
Setting via the operating panel
•
Settings > Monitoring functions > Min. pressure > Enabled.
1. Select and set: Min. pressure.
2. Select: Alarm + stop at min. pressure.
3. Set:
•
Time delay of function at start-up
•
Time delay of function during operation.
Factory setting
The function is disabled.
8.7.62 Max. pressure (4.4.3)
Fig. 113 Max. pressure
Description
The outlet pressure will be monitored if the application is pressure
boosting. In all other applications, the system pressure will be
monitored. CU 352 will react if the pressure becomes higher than
a set maximum level.
In certain installations, a too high outlet pressure may cause
damage. It may therefore be necessary to stop all pumps for a
short period if the pressure is too high.
You can set whether the system is to restart automatically after
the pressure has dropped below the maximum level, or if the
system must be reset manually. Restarting will be delayed by an
adjustable time. See section
8.7.14 Min. time between start/stop
(4.2.1).
Setting range
•
Maximum pressure level within the range of the primary
sensor.
•
Manual or automatic restarting.
Setting via the operating panel
•
Settings > Monitoring functions > Max. pressure > Enabled.
1. Set: Max. pressure.
2. Select resetting: Manual or Auto.
Factory setting
The function is disabled.
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