Control Modes - salmson SIE Serie Instrucciones De Instalación Y Funcionamiento

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6.2

Control modes

H
H
max
H
s
s
H
min
(
Fig. 10: Control p-c
H
H
H
max
H
s
H
min
(
Fig. 11: Control p-v
H
H
n
max
H
s
s
n
min
Fig. 12: Manual control mode
Fig. 13: Example; use of PID-Control
50
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.)
Q
Differential pressure setpoint
H
S
NOTE
For additional information about setting the control mode and the
associated parameters, see Sections 8 "Operation" on page 59 and
9.4 "Setting the control mode" on page 74.
(p-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
Q
H = Differential pressure (min./max.)
Q
= Differential pressure setpoint
H
S
NOTE
For additional information about setting the control mode and the
associated parameters, see Sections 8 "Operation" on page 59 and
9.4 "Setting the control mode" on page 74.
Manual control mode:
The speed of the pump can be kept to a constant speed between n
and n
(Fig. 12). The "manual control mode" deactivates the control
max
at the module.
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 control
(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 on any intermediate
value within a set range (0-100%). The respective actual value (sen-
sor signal) will be also 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 cur-
rent delivery head of the pump(s). It can be, for example, that the
maximum delivery head has already been reached at one sensor sig-
nal < 100%.
For additional information about setting the control mode and the
associated parameters, see Sections 8 "Operation" on page 59 and
9.4 "Setting the control mode" on page 74.
up to the maximum pump curve
s
and ½ H
s
decreases/increases with the
s
.
s
min
04/2009