Wilo Stratos PARA/-Z Serie Notice De Montage Et De Mise En Service page 36

English
6.2 Function of the pump
There is a control module (Fig. 1a/b, item 5) in a vertical design on the motor housing,
which controls the differential pressure of the pump to a setpoint within the control range
and allows an automatic power adjustment of the pump at variable load conditions of the
system.
Depending on the combination of equipment / functions (chapter 6.1 tab. Equipment var-
iants) up to two kinds of automatic power adjustment are possible.
The basic advantages of the electronic control are:
• Energy savings and hence reduction of the operating costs,
• Reduction of flow noises,
The high-efficiency pumps of the Wilo-Stratos PARA-Z series are coordinated specifically
for the operating conditions in potable water circulation systems through a selection of
materials and their design.
6.2.1 Pumps with the "Red button" operating element
On the front of the control module (Fig. 1a, item 5) is the "red button" as a central oper-
ating element (Fig. 1a, item 4), which features three setting ranges.
The following settings can be made:
Constant differential pressure setting range (p-c):
Fig. 1a, item 2: The control mode p-c is active
Variable differential pressure setting range (p-v):
Fig. 1a, item 3: The control mode p-v is active
Setting range Ext. In:
Fig. 1a, item 1: External speed or delivery head setpoint setting via analogue input 0...10V
or pulse-width modulation (PWM) is activated.
NOTE: The minimum and maximum set values for the delivery head during control modes
p-c and p-v are dependent on the pump type and can be read from the pump curve.
If the delivery head setpoint that is set on the red button falls below the minimum set
value, the pump will run in the corresponding control mode at the minimum set value H
If the delivery head setpoint that is set on the red button exceeds the maximum set value,
the pump will run at the maximum set value H
6.2.2 Pumps without the "Red button" operating element
The pumps, whose power adjustment is effected via an analogue signal 0...10V or PWM,
are optionally available with restricted functionality (without p-c and p-v control
modes) and without the red button operating element (Fig. 1b).
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WILO SE 02/2015