1: Inverter; 2: Pump; 3: Pressure sensor; 4: Pressure sensor; 5: Differential pressure sensor
NOTE
If the suction pressure is expected to drop below atmospheric pressure during operation, absolute
rather than relative pressure sensors must be used.
12.2. Electrical connections
The device may be connected to linear pressure sensors with 4 - 20 mA output. The supply voltage range of the
sensor must be such as to include the 15 V DC voltage with which the device feeds the analog inputs.
If a differential pressure sensor is used, it is necessary to connect the sensor to the analog input 1, i.e:
• AN1: 4-20 mA signal (-)
• +15V: 15 VDC power supply (+)
If two pressure sensors are used, one sensor must be connected to analog input 1 while the other sensor must be
connected to analog input 2, i.e.:
• Sensor 1:
• AN1: 4-20 mA signal (-)
• +15V: 15 VDC power supply (+)
• Sensor 2:
• AN2 4-20 mA signal (-)
• +15V: 15 VDC power supply (+)
In circulation systems, the start and stop of the pump is generally controlled by an external contact which can
therefore be connected to digital input 1 (IN1, 0V) and configured accordingly.
12.3. Programming
Menu Parameter Value
IN/OUT paramet. F.scale sensor Sensor full scale value range.
IN/OUT paramet. Min.value sensor Minimum sensor value.
IN/OUT paramet. AN1 AN2 function Independent when a differential pressure sensor is used.
Difference 1-2 when two pressure sensors are used.
IN/OUT paramet. Digital input 1 N.O. when the pump is stopped by closing the contact of digital input 1
N.C. when the pump is stopped by opening the contact of digital input 1
Control. param. Control mode Constant value
Control. param. Set value Differential pressure value that you may want to keep constant.
VASCO - VAriable Speed COntroller
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