Modes - Grundfos CRE Serie Notice D'installation Et De Fonctionnement

3.7 Modes

Grundfos E-pumps are set and controlled according to operating
and control modes.
3.7.1 Overview of modes
Normal
Operating modes
Uncontrolled
Control modes
Constant
curve
1)
For this control mode the pump is equipped with a pressure
sensor. The pump may also be equipped with a temperature
sensor in which case the description would be constant
temperature in control mode controlled.
3.7.2 Operating mode
When the operating mode is set to Normal, the control mode can
be set to controlled or uncontrolled. See section 3.7.3 Control
mode.
The other operating modes that can be selected are Stop, Min. or
Max.
• Stop: the pump has been stopped
• Min: the pump is operating at its minimum speed
• Max: the pump is operating at its maximum speed.
Figure 12 is a schematic illustration of min. and max. curves.
H
Min.
Fig. 12 Min. and max. curves
The max. curve can for instance be used in connection with the
venting procedure during installation.
The min. curve can be used in periods in which a minimum flow is
required.
If the power supply to the pump is disconnected, the mode setting
will be stored.
The remote control R100 offers additional possibilities of setting
and status displays. See section 5.5 Setting by means of R100.
Stop Min. Max.
Controlled
Constant
1)
pressure
Max.
Q
3.7.3 Control mode
Pumps without factory-fitted sensor
The pumps are factory-set to control mode uncontrolled.
In control mode uncontrolled, the pump will operate according to
the constant curve set, fig. 13.
H
Fig. 13 Pump in control mode uncontrolled (constant curve)
3.7.4 Pumps with pressure sensor
The pump can be set to one of two control modes, i.e. controlled
and uncontrolled, fig. 14.
In control mode controlled, the pump will adjust its performance,
i.e. pump discharge pressure, to the desired setpoint for the
control parameter.
In control mode uncontrolled, the pump will operate according to
the constant curve set.
Controlled
H
H
set
Q
Fig. 14 Pump in control mode controlled (constant pressure)
or uncontrolled (constant curve)
Q
Uncontrolled
H
Q
11