Control Functions; Constant Pressure; Dry-Running Protection; Bus Signal - Grundfos CMBE Serie Notice D'installation Et De Fonctionnement

8. Control functions

WARNING
Hot surface
Death or serious personal injury
‐
The product may be so hot that on-
ly the buttons should be touched to
avoid burns.
Pump settings can be made with the following
user interfaces:
Operating panel
• Standard operating panel.

8.1 Constant pressure

The integrated speed controller keeps a constant
pressure in the pipe system. A pressure sensor
monitors changes in the water consumption and
signals to the speed controller to adjust the motor
speed up or down.

8.2 Dry-running protection

CAUTION
Pump damage
The pump may need serious repair or
replacement.
‐
If a dry-running alarm has been ac-
tivated, the cause must be found
before the pump is restarted in or-
der to prevent damage to the
pump.
The system incorporates dry-running protection
that automatically stops the pump in case of dry
running.
The dry-running protection works differently during
priming and operation.

8.3 Bus signal

The product enables serial communication via an
RS-485 input. The communication is carried out
according to the Grundfos GENIbus protocol and
enables connection to a building management
system or another external control system.
Via a bus signal, you can remote-set operating
parameters, such as setpoint and operating
mode. At the same time, the product can provide
status information about important parameters
such as the actual value of the control parameter,
input power, and fault indications, via the bus.
Contact Grundfos for further information.
If you use a bus signal, the local set-
tings made via Grundfos GO Remote
or the advanced operating panel will be
overruled. In case the bus signal fails,
the product will run with the local set-
tings made via Grundfos GO Remote
or the advanced operating panel.
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