DAB e.systwin Instrucciones Para La Instalación Y El Mantenimiento página 17

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.
2.4 - 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
restarted.
If the parameter ET (maximum work time) is set at 0, there will
be exchange at each restart, irrespective of the pump's actual
work time.
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