S&P VFTM IP21, Manual

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ENGLISH
4.2 AUTOMATIC PROPORTIONAL CONTROL WITH A
P$
SIGNAL FROM AN EXTERNAL
ANALOGUE SENSOR (CO2, TEMPERATURE OR RELATIVE HUMIDITY)
4.2.1 Features
In this case, the equipment is used to regulate the air volume in accordance with the value measured by
an external sensor.
The external sensor must emit a
P$
analogue sensor.
With 0-10V input the input voltage values cannot be adjusted.
It is possible to change the behaviour of the proportional output by modifying the value of the LSP, HSP,
CrL3 and CRH3 paramaters.
In this case, some of the parameters configured in the frequency inverter must be re-programmed in the inverter
to avoid exceeding the overpressure value established by the relevant regulations. Access the programming
mode (steps 1 and 2 in section 2.2) and then perform the following configuration changes:
- Press ENTER and rotate the wheel anti-clockwise un til “ 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 wheel 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
I_O- CrL3 7.2 Minimum reference value (mA)
I_O- CrH3 14.4 Maximum reference value (mA)
Ctl- Fr2 AI3 Current type reference (mA)
FUN- PI- PIF No Disable de PI function
- 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.