DAB ESYBOX MAX 60/120M Installations- Und Wartungsanleitungen Seite 64

8.6.2 T1: Low pressure delay (kiwa function)
Sets the time when the inverter switches off after receiving the low pressure signal (see Setting low pressure detection par 9.6.15.5). The low
pressure signal can be received on each of the 4 inputs by suitably configuring the input (see Setup of auxiliary digital inputs IN1, IN2, IN3, IN4
par 9.6.15).
T1 can be set between 0 and 12 s. The factory setting is 2 s.
8.6.3 T2: Delay in switching off
Sets the delay with which the inverter must switch off after switch-off conditions have been reached: plant under pressure and flow rate lower
than the minimum flow.
T2 can be set between 2 and 120 s. The factory setting is 10 s.
8.6.4 GP: Proportional gain coefficient
Generally the proportional term must be increased for systems characterised by elasticity (for example with PVC pipes) and lowered in rigid
systems (for example with iron pipes). To keep the pressure in the system constant, the inverter performs a type PI control on the measured
pressure error. Depending on this error the inverter calculates the power to be supplied to the motor. The behaviour of this control depends on
the set GP and GI parameters. To cope with the different behaviour of the various types of hydraulic plants where the system can work, the
inverter allows the selection of parameters different from those set by the factory. For nearly all plants the factory-set GP and GI parameters are
optimal. However, should any problems occur in adjustment, these settings may be varied.
8.6.5 GI: Integral gain coefficient
In the presence of large falls in pressure due to a sudden increase of the flow or a slow response of the system, increase the value of GI.
Instead, if there are swings in pressure around the setpoint value, decrease the value of GI.
IMPORTANT: To obtain satisfactory pressure adjustments, you generally have to adjust both GP and GI.
8.6.6 RM: Maximum speed
Sets a maximum limit on the number of pump revolutions.
8.6.7 Setting the number of devices and of reserves
8.6.8 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 8.6.10 IC: Configuration examples for multi-pump plants 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, acquired automatically by the system, and NC, the maximum number of simultaneous devices.
8.6.9 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 8.6.10 IC: Configuration examples for multi-pump plants 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.
8.6.10 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 normal 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
continuous 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
ENGLISH
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