Control Modes - salmson LRE Serie Instalacion Y Puesta En Servicio

6.2

Control modes

H
H
max
H
s
s
H
min
Fig. 10: p-c control
H
H
H
max
H
s
½ H
s
H
min
Fig. 11: p-v control
H
H
n
max
H
s
s
n
min
Fig. 12: Manual control mode
Installation and operating instructions LRE, JRE
The selectable control modes are:
p-c:
The electronics keep the differential pressure created by the pump
above the permitted feed flow range constantly at the pre-selected
differential pressure setpoint H
(Fig. 10).
Q = Volume flow
H = Differential pressure (min./max.)
H = Differential pressure setpoint
S
NOTE:
Q
For further information about setting the control mode and the asso-
ciated parameters, see chapter 8 "Operation" on page 81 and chapter
9.4 "Setting the control mode" on page 97.
p-v:
The electronics linearly change the differential pressure setpoint to
be kept by the pump between the delivery heads H
differential pressure setpoint H
ume flow (Fig. 11).
Q = Volume flow
H = Differential pressure (min./max.)
H = Differential pressure setpoint
Q
Q
S
NOTE:
For further information about setting the control mode and the asso-
ciated parameters, see chapter 8 "Operation" on page 81 and chapter
9.4 "Setting the control mode" on page 97.
NOTE:
A differential pressure sensor is needed for the control modes that are
being performed ( p-c and p-v) which sends the actual value to the
electronic module.
NOTE:
The pressure range of the differential pressure sensor must match the
pressure value in the electronic module (menu <4.1.1.0>).
Manual control mode:
The speed of the pump can be kept to a constant speed between n
and n (Fig. 12). "Manual control" mode deactivates all other con-
max
trol modes.
PID control:
If the aforementioned standard control modes cannot be used – e.g.
Q
Q if other sensors are to be used or the distance between the sensors
and the pump is very large – then the PID control (Proportional Inte-
gral Differential control) is available.
By selecting a good combination of individual control portions, the
operator can ensure fast reacting, constant control without lasting
setpoint deviations.
The output signal of the selected sensor can take any intermediate
value. The respective actual value reached (sensor signal) will be
shown as a percent (100% = maximum measurement range of the
sensor) on the status page of the menu.
NOTE:
The displayed percent value only corresponds indirectly to the current
delivery head of the pump(s). It is possible, for example, that the max-
imum delivery head has already been reached at a sensor signal
< 100%.
For further information about setting the control mode and the asso-
ciated parameters, see chapter 8 "Operation" on page 81 and chapter
9.4 "Setting the control mode" on page 97.
up to the maximum pump curve
s
and ½ H
s
decreases or increases with the vol-
s
English
. The
s
min
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