Control Modes - salmson LRE Serie Manual De Instalación Y Puesta En Servicio

6.2

Control modes

H
H
max
H
s
s
H
min
Fig. 10: Δp-c control
H
H
H
max
H
s
½ H
s
H
min
Fig. 11: Δp-v control
H
H
n
max
H
s
s
n
min
Fig. 12: Manual control mode
Fig. 13: Example; use of PID control
Installation and operating instructions LRE-JRE
The selectable control modes are:
Δp-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.)
Q
H = Differential pressure setpoint
S
NOTE
For additional information about setting the control mode and the
associated parameters, see Section 8 "Operation" on page 67 and
Section 9.4 "Setting the control mode" on page 83.
Δp-v:
The electronics change the differential pressure setpoint to be main-
tained by the pump linearly between the delivery head H
The differential pressure setpoint H
volume flow (Fig. 11).
Q = Volume flow
H = Differential pressure (min./max.)
Q
Q
H = Differential pressure setpoint
S
NOTE
For additional information about setting the control mode and the
associated parameters, see Section 8 "Operation" on page 67 and
Section 9.4 "Setting the control mode" on page 83.
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 standard control modes mentioned above cannot be used –
Q
Q
for example, for Y-pipe installation or generally if the controller is
not directly connected to the pipe (Fig. 13) – the PID (Proportional-
Integral-Differential) control function 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 can be, for example, that the maxi-
mum 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 Section 8 "Operation" on page 67 and Section
9.4 "Setting the control mode" on page 83.
up to the maximum pump curve
s
and ½ H
s
decreases/increases with the
s
English
.
s
min
56