Italtecnica Nettuno 3P-13A Manuel D'instruction page 36

4÷20mA PRESSURE SENSOR
An external pressure sensor (optional, code no. TRPR-016-
420MA) with 4÷20mA signal can be connected to Nettuno
to obtain a closed loop pressure control system. The speed
of the electric pump is regulated according to the effective
demands of the system to maintain constant pressure.
The power supply voltage of the sensor is 10Vdc. The use
of 2-wire transducers is recommended, connected as shown
in the diagram alongside (red wire +, black wire -).
The sensor cable shielding, if present, can be connected to
the GND terminal to reduce interference on the sensor
signal itself.
The device is compatible with pressure sensors with a scale
from 0-6Bar to 0-16Bar, or from 0-100 PSI to 0-250 PSI.
0-10V ANALOGUE INPUT
Nettuno operation can also be controlled via a 0-10V
analogue signal. The speed of the pump is regulated
according to the voltage value on input, considering that 0V
corresponds to 0 Hz and 10V corresponds to the set
maximum nominal frequency of the pump (50 or 60Hz). The
pump is stopped when the control voltage value corresponds
to a frequency value below the parameter set as the stop
frequency (factory setting 35 Hz).
DIGITAL INPUTS
Nettuno has 3 digital inputs, assigned with the following
functions:
- I.1 = input for dual set point ; if the function is
activated via the menu, the inverter uses the
second pressure set point value as reference for
operation at constant pressure, when the contact is
switched between terminal C (common) and input
I.2. This can be used to control a different
operating pressure value during operation.
-
I.2 = input for external enabling; if the
activated via the menu, the inverter only starts up
if the contact is switched between terminal C
(common) and input I.1. This can be used for
connection of a float, timer etc.
- I.3 = input for error; if the function is activated
via the menu, the inverter blocks the motor when
the contact is switched between terminal C
(common) and input I.3. The message "external
error" then appears on display. This can be used
for an external block signal, for example from a
flooding sensor or float.
The three digital inputs can all be configured via the software
as NO or NC; if the input is set to OFF their functioning is
completely ignored.
Refer to the parameter settings section for further details.
function is
36
RED
BLACK
10V
10-50K
0V