Xylem Lowara SM30 Manual De Instalación, Funcionamiento Y Mantenimiento página 41

When the autotest has failed
If during the autotest (whatever pump is operating) the minimum pressure switch (CONV.L.SWITCH)
installed on the set trips, the autotest is definitively interrupted and the set resumes working in
automatic mode.
The display shows the message AUTOTEST FAIL P#.
CONV.L.SWITCH intervention is delayed by the time set on the parameter AUX3 IN DELAY.
How to interrupt the autotest
To interrupt the autotest, press the button P3 (ESC).
6.2.6 LOAD LOSS COMPENSATION
Sometimes in the systems there is a fall in pressure caused by load losses along the pipes and these
increase when the required water flow increases.
Phas Display
e
0 COMPENSATION
1 COMP.THRESHOL
D
To compensate system load losses it is possible to enable a control that supplies a pressure
proportional to the load. A direct measurement of the flow is not taken, but it is believed that it is
proportional to the number of pumps running.
When each duty pump after the first is started, the UPPER and LOWER thresholds are increased by
the value indicated in the COMP. THRESHOLD parameter.
The jockey pump is excluded.
UPPER
LOWER
6.2.7 PROGRAMMING THE ALARM RELAY
The SM30 BSETF3 board has an output alarm relay which is activated as described below for the
following types of alarms:
The alarm relay is available and programmable only and exclusively if the AUTOTEST function
has not been enabled.
If AUTOTEST is enabled, the parameters described below will not be displayed.
Comment
Available only with systems with a
pressure sensor
Enable load loss compensation with
increase of the start and stop
thresholds in bar for the pumps after
the first.
Setting pressure = 0 bar disables the
function.
SUP
INF
1 pump
1 pompa
ON ON
Variable thresholds to compensate load
Soglie variabili per compensazione perdite di carico
losses
Increase
Incremento
2 pumps
3 pumps
2 pompe 3 pompe
ON
ON ON
Field
000.00 bar 000.00
bar
ON
en
Default
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