Setting The Control Mode - salmson SIE Serie Installation Et Mise En Service

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9.4

Setting the control mode

H
H
max
H
1
s
s
H
2
s
H
min
H
H
H
max
H
1
s
H
2
s
H
min
Fig. 43: Δp-c/Δp-v control
H
H
n
max
H
s
s
n
min
Fig. 44: Manual control mode
108
CAUTION! Risk of property damage!
An inadequate volume flow can lead to damage on the mechanical
shaft seal; the minimum volume flow depends on the rotation
speed of the pump.
• Make sure that the volume flow does not fall below the minimum
value Q .
min
Calculation of Q
Q = 10% x Q
min
Δp-c/Δp-v control:
Setting (Fig. 43) Δp-c
1 Duty point on
maximum pump
curve
Q
2 Duty point
within the
control range
Setting range
Q Q
NOTE:
Alternatively, manual control mode (Fig. 44) or PID operating
mode can also be set.
Manual control mode:
"Manual control" mode deactivates all other control modes. The speed of
the pump is kept to a constant value and set using the rotary knob.
The speed range is dependent on the motor and pump type.
PID control:
The PID controller in the pump is a standard PID controller, as described in
Q
Q
control technology literature. The controller compares a measured proc-
ess value to a predefined setpoint and attempts to adjust the process
value to match the setpoint as closely as possible. Provided appropriate
sensors are used, a variety of control systems (including pressure, differ-
ential pressure, temperature and flow control) can be realised. When
selecting a sensor, pay attention to the electrical values in Table 4
"Connection terminal assignment" on page 89.
The control behaviour can be optimised by adjusting the P, I and D
parameters. The P (or proportional) term of the controller contributes
a linear gain of the deviation between the process (actual) value and
the setpoint to the controller output. The sign of the P term deter-
mines the controller's direction of action.
:
min
Actual speed
x
max pump
max. speed
Starting at the duty
point, draw towards the
left. Read off setpoint
H and set the pump to
S
this value.
Starting at the duty
point, draw towards the
left. Read off setpoint
H and set the pump to
S
this value.
H , H
min max
See pump curves
(e.g. on data sheet)
Δp-v
Starting at the duty
point, draw towards the
left. Read off setpoint
H and set the pump to
S
this value.
Move to max. pump
curve along control
curve, then horizontally
to the left, read off set-
point H and set the
S
pump to this value.
H , H
min max
See pump curves
(e.g. on data sheet)
Salmson 05/2015