Grundfos Control MPC-Serie Installationsanleitung Seite 61

8.7.57 Max. pressure (4.4.3)
Fig. 108Max. 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.
8.7.58 External fault (4.4.4)
Fig. 109External fault
Description
The function is used when CU 352 is to be able to receive a fault
signal from an external contact. In case of external fault, CU 352
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 352
reacts.
• Reaction in case of external fault: Warning or alarm and
change of operating mode.
• Restarting after alarm: Manual or Auto.
Setting via the operating panel
• Settings > Monitoring functions > External fault > Go to setting
of digital input. Display 8.7.28 Digital inputs (4.3.7)
1. Set the input to "External fault".
2. Press [Back].
3. Set: Time delay, fault indication.
4. 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.
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