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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 function is 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.
DIGITAL OUTPUTS
Two digital relay outputs are available for signalling operation status. The relays can be
configured via the software independently, to perform one of the following functions:
-
error signalling
-
pump running signal
-
control of an electric pump at fixed speed, connected directly to the mains via a power
relay
Refer to the parameter settings section for further details on configuration of the digital
outputs.
RED
BLACK
+10V
0V (GND)
SIGNAL
