Grundfos Control DDD Montage- Und Betriebsanleitung Seite 54

8.7.54 Max. pressure (4.4.3)
Fig. 108 Max. pressure
Description
The outlet pressure will be monitored if the function is enabled.
CU 354 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 8.7.13 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 operating panel
• Settings > Monitoring functions > Max. pressure > Enabled.
4. Set: Max. pressure.
5. Select resetting: Auto or Manual.
Factory setting
The function is disabled.
54
8.7.55 External fault (4.4.4)
Fig. 109 External fault
Description
The function is used when CU 354 is to be able to receive a fault
signal from an external contact. In case of external fault, CU 354
indicates warning or alarm. In case of alarm, the system changes
to another manual operating mode, for instance "Stop."
Setting range
• Selection of digital input for the function.
• Setting of time delay from closing of the contact until CU 354
reacts.
• Reaction in case of external fault: Warning or alarm and
change of operating mode.
• Restarting after alarm: Manual or automatic.
Setting via operating panel
• Settings > Monitoring functions > External fault > Go to setting
of digital input. Display Digital inputs (4.3.7)
6. Set the input to "External fault".
7. Press [Back].
8. Set: Time delay, fault indication.
9. If only a warning is required in case of external fault, select
"Warning".
If the system is to give alarm and change operating mode in
case of external fault, select operating mode "Manual" or
"Auto".
Factory setting
The function is disabled. If the function is enabled, the following
values have been set from factory:
• Time delay: 5 seconds.
• Operating mode in case of alarm: Stop.
• Restarting: Manual.
appears.