Grundfos CONTROL MPC User Manual

51
11.7.46 Min. pressure (4.4.2)
Fig. 91 Min. pressure
Description
The discharge pressure is monitored if the application is pressure
boosting. In all other applications, the system pressure is
monitored. The CU 351 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 Control
MPC 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 a manual reset of alarms.
It is possible to set a start-up delay ensuring that the system can
build up pressure before the function is activated. 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
• Activation of the function.
• Minimum pressure level within the range of the primary
sensor.
• Activation of stop when the pressure falls below the minimum
pressure.
• Time delay at start-up.
• Time delay during operation.
Setting via control panel
1. Mark the Settings menu with .
2. Mark Monitoring functions with or , and press .
3. Mark Min. pressure with or , and press .
4. Mark Activated with or , and press to activate/
deactivate the function.
5. Mark Min. pressure with or . Set the pressure with
or , and save with .
6. Mark Stop at min. pressure with or , and press
to activate/deactivate the function.
7. Mark Time delay of function at start-up with or .
Set the time with or , and save with .
8. Mark Time delay of function during operation with or
. Set the time with or , and save with .
Factory setting
The function is deactivated.
11.7.47 Max. pressure (4.4.3)
Fig. 92 Max. pressure
Description
The discharge pressure is monitored if the application is pressure
boosting. In all other applications, the system pressure is
monitored. The CU 351 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 Control MPC is to restart
automatically after the pressure has dropped below the maximum
level, or if the system must be reset manually. Restart will be
delayed by an adjustable time. See section 11.7.12 Min. time
between start/stop (4.2.1).
Setting range
• Activation of the function.
• Maximum pressure level within the range of the primary
sensor.
• Manual or automatic restart after fault.
Setting via control panel
1. Mark the Settings menu with .
2. Mark Monitoring functions with or , and press .
3. Mark
Max. pressure with or , and press .
4. Mark Activated with or , and press to activate/
deactivate the function.
5. Mark Max. pressure with or . Set the pressure with
or , and save with .
6. Mark Manual or Auto with or . Activate the function
with .
Factory setting
The function is deactivated.
TM03 8981 4807 TM03 8982 4807

Grundfos CONTROL MPC Specifications

General

Brand	Grundfos
Model	CONTROL MPC
Category	Control Systems
Language	English