Assigning The Starting Order; Maximum Work Time; Reaching The Maximum Inactivity Time; Reserves And Number Of Devices That Participate In Pumping - DAB e.sybox Instructions Pour L'installation Et L'entretien

9.4.8 - Assigning the starting order

Each time the system is switched on a starting order is associated with
each device. Depending on this, the sequential starts of the devices are
decided.
The starting order is modified during use as necessary by the following
two algorithms:
• Reaching the maximum work time

• Reaching the maximum inactivity time

9.4.9 - Maximum work time

Depending on the parameter ET (maximum work time), each device
has a working time counter, and depending on this the starting order is
updated with the following algorithm:
- if at least half of the ET value has been exceeded, the priority
is exchanged the first time the inverter switches off (exchange
to standby).
- if the ET value is reached without ever stopping, the inverter is
switched off unconditionally and is taken to minimum restarting
priority (exchange during running).
If the parameter ET (maximum work time) is set at 0, there is an
exchange at each restart.
See 7.6.11 - ET: Max. switching time.
9.4.10 - Reaching the maximum inactivity time
The multipump system has an anti-stagnation algorithm, the aim of which
is to keep the pumps in perfect working order and to maintain the integrity
of the pumped fluid. It works by allowing a rotation in the pumping order
so as to make all the pumps supply at least one minute of flow every
23 hours. This happens whatever the device configuration (enabled or
reserve). The exchange of priority requires that the device that has been
stopped for 23 hours be given maximum priority in the starting order. This
means that as soon as it is necessary to supply flow, it will be the first to
start. The devices configured as reserve have precedence over the oth-
ers. The algorithm ends its action when the device has supplied at least
one minute of flow.
When the intervention of the anti-stagnation algorithm is over, if the
device is configured as reserve, it is returned to minimum priority to
preserve it from wear.

9.4.11 - Reserves and number of devices that participate in pumping

The multipump system reads how many elements are connected in com-
munication and calls this number N.
Then depending on the parameters NA and NC it decides how many and
which devices must work at a certain time.
NA represents the number of devices that participate in pumping. NC rep-
resents the maximum number of devices that can work at the same time.
If there are NA active devices in a chain and NC simultaneous devices
with NC smaller than NA, it means that at the most NC devices will start
at the same time and that these devices will exchange with NA elements.
If a device is configured with reserve preference, it will be the last in the
starting order, so for example if I have 3 devices and one of these is con-
figured as reserve, the reserve will be the third element to start, whereas
if I set NA=2 the reserve will not start unless one of the two active ones
develops a fault.
See also the explanation of the parameters
7.6.8 - NA: Active devices;
7.6.9 NC: Simultaneous devices;
7.6.10 IC: Configuration of the reserve.
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