Grundfos VLSE, Installation And Operating Instructions Manual

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Eng
lish (US)
20
16.3 Control mode
16.3.1 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.
19 .
Fig. 19 Pump in control mode uncontrolled (constant curve)
16.3.2 Pumps with pressure sensor
The pump can be set to one of two control modes, i.e. controlled
and uncontrolled, fig.
20 .
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.
Fig. 20 Pump in control mode controlled (constant pressure)
or uncontrolled (constant curve)
17. Setting up the pump
17.1 Factory setting
Pumps without factory-fitted sensor
The pumps have been factory-set to control mode uncontrolled .
The setpoint value corresponds to 100 % of the maximum pump
performance (see data sheet for the pump).
Pumps with pressure sensor
The pumps have been factory-set to control mode controlled .
The setpoint value corresponds to 50 % of the sensor measuring
range (see sensor nameplate).
18. Setting by means of control panel
Proportional pressure
The pump head is reduced at decreasing water demand and
increased at rising water demand. See fig.
21 .
This control mode is especially suitable in systems with relatively
large pressure losses in the distribution pipes. The head of the
pump will increase proportionally to the flow in the system to
compensate for the large pressure losses in the distribution
pipes.
The setpoint can be set with an accuracy of 0.33 ft (0.1 m).
The head against a closed valve is half the setpoint, H
set
.
Fig. 21 Proportional pressure
This control mode requires a factory-fitted differential-pressure
sensors as shown in the example below:
Fig. 22 Proportional pressure
18.1 Setting of operating mode
Settings available:
• Normal
• Stop
• Min.
• Max.
Start/stop of pump
Start the pump by continuously pressing until the desired
setpoint is indicated. This is operating mode Normal.
Stop the pump by continuously pressing until none of the light
fields are activated and the green indicator light flashes.
T
M
00
7
7
4
6
13
04
TM
00
766
8
040
4
H
Q
Q
H
set
H
Q
H
Uncontrolled Controlled
T
M
05
7
9
0
9
16
13
Example
• Factory-fitted differential-pressure sensor.
H
Q
H
set
H
set
2
p