Grundfos Control MPC Montage- Und Betriebsanleitung Seite 19

The system has six operating modes:
1. Normal
• The pumps adapt their performance to the requirement.
2. Max.
• The pumps run at a constant high speed. Normally, all pumps
run at maximum speed.
3. User-defined
• The pumps run at a constant speed set by the user. It is
usually a performance between Max. and Min..
4. Min.
• The pumps run at a constant low speed. Normally, one pump
is running at a speed of 70 %.
5. Stop
• All pumps have been stopped.
6. Emergency run
• The pumps run according to the setting made in display
Emergency run (4.3.5).
The performance required in these operating modes can be set in
the menu Settings:
• Max.
• Min.
• User-defined
• Emergency run.
See sections Min., max. and user-defined duty (4.3.14)
and Emergency run (4.3.5).
The actual operating mode can be controlled from four different
sources:
• Fault
• External signal
• CU 352
• Bus.
Control source
You can set the system to remote control via an external bus
(option). In this case, you must set a setpoint and an operating
mode via the bus.
In the menu Settings, you can select whether CU 352 or the
external bus is to be the control source.
The status of this setting is shown in the display Operating mode.
Related information
8.6.27 Emergency run (4.3.5)
8.6.38 Min., max. and user-defined duty (4.3.14)
8.3.4 Setpoint (1.2.2)
Setpoint
Description
The display shows the selected setpoint and whether it comes from
CU 352 or an external bus.
The display also shows all seven possible setpoints from CU 352
(for closed- and open-loop control). At the same time, the selected
setpoint is shown.
As it is a status display, no settings can be made.
You can change the setpoints in the menus Operation or Settings.
See section Alternative setpoints (4.1.2).
Related information
8.6.3 Alternative setpoints (4.1.2)
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