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8.7.49 Min. pressure (4.4.2)
Fig. 99
Min. pressure
Description
The discharge pressure will be monitored if the application is
pressure boosting. In all other applications, the system pressure
will be monitored. The 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 discharge pressure becomes
lower than the set minimum pressure.
It is possible to 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
discharge pressure may be due to pipe fracture and thus an
extraordinarily high consumption and a very low counter-
pressure. In such situations, it is desirable that the system stops
and indicates alarm. This situation will require manual resetting of
alarms.
It is possible to set a start-up delay ensuring that the system can
build up pressure before the function is enabled. It is also
possible to set a time delay, i.e. for how long time the discharge
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 control 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.
8.7.50 Max. pressure (4.4.3)
Fig. 100
Max. pressure
Description
The discharge pressure will be monitored if the application is
pressure boosting. In all other applications, the system pressure
will be monitored. The CU 352 will react if the pressure becomes
higher than a set maximum level.
In certain installations, a too high discharge pressure may cause
damage. It may therefore be necessary to stop all pumps for a
short period if the pressure is too high.
It is possible to 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
8.7.13 Min. time between start/stop
Setting range
• Maximum pressure level within the range of the primary
sensor.
• Manual or automatic restarting.
Setting via control panel
• Settings > Monitoring functions > Max. pressure > Enabled.
4. Set: Max. pressure.
5. Select resetting: Auto / Manual.
Factory setting
The function is disabled.
