Italtecnica Nettuno 3P-13A Manuel D'instruction page 44

GROUP 2 : MULTIPLE OPERATION PARAMETERS
2.0 Serial
Address
2.1Press.
ser.address
2.2 Auxiliary
pump
- deactivate multiple operation by setting parameter 2.5 to OFF
- set parameters 3.4 or 3.5 to "AUX" to associate the auxiliary pump function with one of the output relays.
2.3 Partner act.
delay 2.0 sec
2.4 Timed master
Swapping
2.5 Booster
mode funct.
if, on systems with multiple pumps, the user wishes to assign one as a reserve pump, activated only in the event of a
fault of all other inverters. This parameter should be set to OFF also if the user wishes to use the auxiliary pump
function via one of the relays of the I/O board, as this function is not compatible with multiple mode function.
2.6 Reduced
freq. Value 80%
of the pump. When intervention of the partner device at the reduced threshold value is not sufficient to guarantee the
set pressure value, the partner device is then set to operate at the maximum nominal frequency.
2.0 – Serial address: in the case of single installations with a single pump,
leave this value at 1. If a pressurisation unit with multiple pumps is
installed, set the number of the device in the serial bus from 1 to 8. Each
1
device must have a different serial address number to be separate from the
.
others
2.1 – Pressure sensor serial address: in the case of single installations
Sensor
with a single pump, leave this value at 1. If a pressurisation unit with
multiple pumps is installed, set the number of the device to which the
1
pressure sensor and any other auxiliary inputs are connected.
The value must be the same for all devices to ensure that only one pressure
sensor transmits the signal to all inverters.
2.2 – Auxiliary pump: Nettuno can be connected to an auxiliary pump at
fixed speed via one of the relays on the I/O board. The auxiliary pump is
started up when the maximum frequency is reached and the pressure is
OFF
below the set point. To enable the auxiliary pump function, proceed as
follows:
2.3 – Partner activation delay: this defines the delay before Nettuno
activates the auxiliary pump or requests intervention of a partner inverter
when the maximum frequency is reached. Increase this delay interval if too
many consecutive start-ups occur at close intervals of the auxiliary pump or
partner inverters in the case of high speed pressure transients in the system.
Reduce the parameter to increase the speed of intervention of the partner
device or pilot pump on increase of water demand
2.4 – Timed master changeover: when using pressurisation units with
multiple pumps, it is possible to implement timed master changeover,
where, together with pump shut-down, the master is also changed over
OFF
every 60 minutes of continuous operation. In this way, in systems where
collection is continuous and the stop condition for all pumps is never
reached, the correct changeover of master devices is still guaranteed
2.5 - Multiple mode activation: set this parameter to OFF to disable
Nettuno for multiple mode operation with several inverters. In this case the
device, though powered, is not involved in multiple mode operation and
ON
therefore does not become a master device or intervene as a partner device.
However, if no master is present for 15 seconds, the device starts operating
as a new master and takes control of the system. This function can be used
2.6 - Reduced threshold value: when a partner device is set in operation to
assist the master device in maintaining the set point pressure, the activation
frequency is initially reduced to the set value (as a percentage of the
nominal value) in this parameter. In this way, both the partner and master
devices can operate in a balanced way, close to the maximum output point
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