DAB E.Sybox Gebruiks- En Onderhoudsaanwijzing pagina 93
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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.
7.6.10.1 - 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
NC=NA) and one as reserve (IC=reserve on one of the two devices).
The result obtained is the following: the device that is not configured
as reserve always starts first, if the pressure detected is too low the
second device, configured as reserve, also starts. In this way we always
try to preserve the use of one device in particular (the one configured
as reserve), but this may be useful in case of necessity when a greater
hydraulic load occurs.
Example 3:
A pump set composed of 4 devices (N=4 detected automatically) of which
3 set active (NA=3), 2 simultaneous (NC=2) and 1 as reserve (IC=reserve
on two devices),
The result obtained is the following: at the most 2 devices will start at
the same time. The operation of the 2 that can work simultaneously will
take place in rotation among 3 devices so as to respect the maximum
exchange time of each (ET). If one of the active devices develops a fault
no reserve starts up because more than 2 devices cannot start at one
time (NC=2) and there are still 2 active devices present. The reserve
intervenes as soon as another of the 2 develops a fault.
7.6.11 - ET: Max. switching time
Sets the maximum continuous working time of a device in a set. It is
significant only on pump sets with interconnected devices. The time can
be set between 1 min and 9 hours; the factory setting is 2 hours.
When the ET of a device has elapsed the system starting order is reas-
signed so as to give minimum priority to the device on which the time
has elapsed. The aim of this strategy is to use less the device that has
already worked and to balance the working time between the various
machines that make up the set. If the hydraulic load still requires the in-
tervention of the device, even though it has been put last in starting order,
it will start to guarantee pressure boosting of the system.
The starting priority is reassigned in two conditions based on the ET time:
1. Exchange during pumping: when the pump remains on without
interruption until the absolute maximum pumping time has been
exceeded
2. Exchange to standby: when the pump is on standby but 50% of the
ET time has been exceeded
If ET has been set at 0 there will be exchange to standby. Whenever
a pump in the set stops, a different pump will start first next time it is
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