SPEEDMATIC SET ALT
BEFORE INSTALLATION AND USE READ THE FOLLOWING INSTRUCTIONS CAREFULLY.
THE MANUFACTURER DECLINES ALL RESPONSIBILITY IN THE EVENT OF ACCIDENT OR DAMAGE DUE TO
NEGLIGENCE OR FAILURE TO OBSERVE THE INSTRUCTIONS DESCRIBED IN THIS MANUAL OR IN CONDITIONS
THAT DIFFER FROM THOSE INDICATED ON THE DEVICE.
OPERATION
SPEEDMATIC SET ALT is a compact automatic control device ( see fig.7) designed for the automation of
pressure groups with 2 pumps, with an electronic system managed by a software responding to the rigorous
requirements of efficiency and safety of the most important builders of pumps. It includes a frequency inverter
for the main pump control regulating the speed in order to keep constant the pressure independently of the flow
given, the auxiliary pump is managed by mean of power relay.
There is alternated operating sequence, these means that the pump managed by the inverter is changed in
each operating cycle and it is always the first to start.
The system incorporates a LCD screen where the parameters configuration is very easy and intuitive. Once
the configuration parameters are introduced, the SPEEDMATIC SET ALT manages the start-up of the
different system pumps and the frequency inverter. It assures a constant pressure and an important costs
reduction because at any time the control will feed the system with the right and necessary output, obtaining a
maximum energetic efficiency. In order to establish the ideal pressure in the installation is suitable to consider
following criteria:
Hm: Max. water column height in m. It depends on the number of floors and it corresponds to the height
from the pump to the last floor. Every 10 m of height corresponds approximately to 1 bar (0.98 bar).
Pw: Available minimum pressure in last floor (usually 1.5 bar).
Pc: Pressure drop. It can be considered with a simplified criteria as 0.033 bar/m.
Prmin: Minimum resultant pressure. It is the sum of the previous pressures and it will be the starting
pressure of the pumps.
Example for a 5 floors building (15 m) with pumps placed at level 0:
Hm =15 m = 1.5 bar
Pw = 1,5 bar Pc=15 x 0,033 bar = 0,5 bar Prmin = 1,5 + 1,5 + 0,5 = 3,5 bar
Once has been defined the optimal pressure in the installation, the group must be sized to provide the necessary
flow using the appropriate coefficients of simultaneity. During this process the following errors are common:
l
Under-sizing the group: all the pumps are operating at full speed, without modulation.
l
The ratio FLOW/PRESSURE10% is identical to which is able to provide the main pump: in applications
with regular consumption during long periods of time - it is not the case of a block of houses where the
consumption is oscillating - we find an equilibrium where the main pump by itself cannot satisfy the flow
and pressure exigencies, but, when starting the auxiliary pump, the main pump decreases its speed
below the recommendable limit, in consequence the system has constant operating rotations. In
systems of oscillating consumptions this equilibrium point does not suppose any problem, but in regular
consumptions during long periods of time, this phenomenon must be avoided because the lifespan of the
pumps will fall.
CLASSIFICATION AND TYPE
According to EN-60730-1 the SPEEDMATIC SET ALT is a device of independent assembly, type 1B with
software of class A.
EN
Summary of Contents for SET 202110 ALT
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