Examples Of Configuration For Multipump Systems - DAB E.SYTWIN Instructions Pour L'installation Et L'entretien

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• O2 Function output 2
• RM Maximum speed
2 - Setting the number of devices and of reserves
2.1 - NA: Active devices
Sets the maximum number of devices that participate in pumping.
It may have values between 1 and the number of devices present (max
4). The default value for NA is N, that is the number of devices present
in the chain; this means that if devices are added to or removed from
the chain, NA always has the value of the number of devices present,
automatically detected. If a number different from N is set, this fixes
the maximum number of devices that can participate in pumping at the
number set.
This parameter is used in cases where there is a limit on the pumps you
can or want to be able to keep running, and if you want to keep one or
more devices as a reserve (see 2.3 IC: Configuration of the reserve and
other examples below).
On the same menu page you can also see (but not change) the other two
system parameters linked to this, that is N, the number of devices pres-
ent, acquired automatically by the system, and NC, the maximum number
of simultaneous devices.
2.2 NC: Simultaneous devices
Sets the maximum number of devices that can work at the same time.
It may have values between 1 and NA. The default value of NC is NA, this
means that even if NA increases, NC will have the value NA. If a number
different from NA is set, this releases you from NA and fixes the maximum
number of simultaneous devices at the number set. This parameter is
used in cases where there is a limit on the pumps you can or want to be
able to keep running (see 2.3 IC: Configuration of the reserve and other
examples below).
On the same menu page you can also see (but not change) the other
two system parameters linked to this, that is N, the number of devices
present, read automatically by the system, and NA, the number of active
devices.
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2.3 IC: Configuration of the reserve
Configures the device as automatic or reserve. If set on auto (default)
the device participates in normal pumping, if configured as reserves,
minimum starting priority is associated with it, this means that the device
with this setting will always start last. If a number of active devices is set
that is one lower than the number of devices present and if one element
is set as reserve, the effect obtained is that, if there are no problems, the
reserve device does not participate in regular pumping; instead, if one of
the devices that participates in pumping develops a fault (maybe loss of
power supply, tripping of a protection, etc.), the reserve device will start.
The state of configuration as a reserve can be seen as follows: on the
Multi-pump System page, the top of the icon is coloured; on the AD and
main pages, the communication icon representing the address of the
device appears with the number on a coloured background. There may
be more than one device configured as reserve in a pumping system.
Even though the devices configured as reserve do not participate in nor-
mal pumping, they are nevertheless kept efficient by the anti-stagnation
algorithm. The anti-stagnation algorithm changes the starting priority
once every 23 hours and allows the accumulation of at least one continu-
ous minute of supply of flow from each device. The aim of this algorithm
is to avoid the deterioration of the water inside the impeller and to keep
the moving parts efficient; it is useful for all devices and especially for
those configured as reserve, which do not work in normal conditions.

2.3.1 - Examples of configuration for multipump systems

Example 1:
A pump set composed of 2 devices (N=2 detected automatically) of which
1 set active (NA=1), one simultaneous (NC=1 or NC=NA since NA=1)
and one as reserve (IC=reserve on one of the two devices).
The result obtained is the following: the device not configured as a
reserve will start and work by itself (even though it does not manage to
bear the hydraulic load and the pressure achieved is too low). If it has a
fault, the reserve device steps in.
Example 2:
A pump set composed of 2 devices (N=2 detected automatically) in which
all the devices are active and simultaneous (factory settings NA=N and