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Risk of foreign bodies in pipelines: the presence of dirt in the fluid may obstruct transfer channels,
block the flow or pressure sensor and impair correct system operation. Take care to install the sensors so that
they are not subject to the build-up of excessive sediment or air bubbles that may impair operation. If the size
of the pipeline enables transit of foreign bodies, a special filter may need to be installed.
2.2.3
Connection of sensors
The ends for connecting the sensors are in the centre and are accessible by removing the screw of the
connections cover, see Figure 2. The sensors must be connected to the relative inputs marked "Press" and
"Flow"; see Figure 6.
2.2.3.1
Connecting the pressure sensor
The inverter accepts two types of pressure sensor:
1. Ratiometric 0 – 5V (Voltage sensor to be connected to connector press1)
2. In current 4 - 20 mA (Current sensor to be connected to connector J5)
The pressure sensor is supplied with its own cable, and the cable and connection on the board varies according
to the type of sensor used. Both types of sensor can be supplied
2.2.3.1.1
Connecting a ratiometric sensor
One end of the cable must be connected to the sensor and the other end to the relative inverter pressure
sensor input, marked "Press 1"; see Figure 6.
The cable has two different terminals with compulsory direction of insertion: connector for industrial
applications (DIN 43650) on the sensor side and 4-pole connector on the inverter side.
On multiple systems, the ratiometric pressure sensor (0-5V) can be connected to any inverter in the chain.
The use of ratiometric pressure sensors (0-5V) is strongly recommended to facilitate wiring.
When using ratiometric pressure sensors, there is no need for wiring to transfer pressure
information readings between the various inverters. The interconnection link cable deals with
this operation
ENGLISH
Figure 8: Sensor connections
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