S&P VFTM Series, Manual

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4.4. PI CONTROL IN CONSTANT PRESSURE / AIRVOLUME SYSTEMS WITH AN EXTERNAL ANALOG
SENSOR AND 4-20Ma SENSOR
4.4.1 Features
The inverter is used to guarantee a specific setpoint value established by an analog sensor emitting a 4-20mA
signal.
For this use, some of the parameters configured in the frequency inverter must be re-programmed. To do so,
please see page XX.
- Keep
ESC pressed down for 2 seconds until the 3 mode leds light up simultaneously. At the moment they
are in Programming Mode .
- Press ENTER and rotate the wheel anti- clockwise until “ SEt- ” appears on the screen.
-
Press ENTER and rotate the wheel anti- clockwise until “ LSP ” appears on the screen.
- Press ENTER and rotate the wheel until the necessary value appears for the “Minimum frequency in
Hz ” parameter. Press ENTER to confirm the value entered. If this value is different to the previous one,
the display should flash.
- Press ESC to exit the “ LSP ” parameter.
- Rotate the whe el until ” HSP ” appears on the screen .
- Press ENTER and rotate the wheel until the necessary value appears for the “ Maximum frequency in
Hz ” parameter. Press ENTER to confirm the value entered. If this value is different to the previous one,
the display should flash.
- Press ESC to exit the “ HSP ” parameter.
- Press ESC to exit the “ Set- ” menu.
- Follow the method used to configure the two initial parameters until all of the parameters in the following
table have been configured:
MENU Parameter Value Comment
Ctl- Fr1 AI3 Current type reference (mA)
- Press ESC to exit the “ CtL- ” menu.
- Keep ESC pressed down for 2 seconds until the 3 mode leds light up in sequence. It is now in RUN
mode, available for automatic inverter operation.
4.4.2 Wiring diagram
Follow the inverter-motor wiring diagram shown in the following illustrations depending on the type of motor used
and whether this motor has thermal protection:
- Fig.6.1. Single phase power supply 1/230/50-60, three phase motor 230/400V without thermal protection
and 4-20mA signal (automatic reset)
- Fig.6.2. Three phase power supply 3/400/50-60, three phase motor 230/400 or 400V without thermal
- Fig.6.3. Single phase power supply 1/230/50-60, three phase motor 230/400V with thermal protection
and 4-20mA signal.
IMPORTANT: Before carrying out the wiring read the point 2.3 and 2.5 to determine the type of restart to
configure.
- Fig.6.4. Three phase power supply 3/400/50-60, three phase motor 230/400 or 400V with thermal
protection and 4-20mA signal.
IMPORTANT: Before carrying out the wiring read the point 2.3 and 2.5 to determine the type of restart to
configure.
Check that the “ SW1 ” switch is in the “ SOURCE ” position
Install the indicated jumpers in the inverter terminal box.
Power the frequency inverter with suitable voltage for the inverter model in question.
The frequency inverter will start automatically when it receives power and will perform PI controller functions