VACON NX frequency converter (NXVFD) is an electronic device for control of speed and torque of three-phase alternating current (AC) motors. NXVFD converts the fixed frequency and voltage of the main supply (mains) to a variable frequency and voltage, which can then be regulated to provide flexible motor operation and reduce energy consumption. VACON NX frequency converters can be connected to the LonWorks network using a fieldbus board.
VACON NXOPTC4 option board is equipped with an FTT-10A transceiver supporting the Free Topology transformer coupled network, which allows the network wire to be connected as bus, star, loop or combination of these. The converter can then be controlled, monitored and programmed from the Host system. The LonWorks board shall be installed in slot E on the control board of the frequency converter. The converter can then be controlled, monitored and programmed from the LONWORKS network.
IMPORTANT NOTE:
After the option card is installed, it is mandatory to make the following settings:
The NXVFD device can be controlled from three different places. They are (default control place is Key Pad (panel))
- I/O terminal
- Key Pad (panel)
- Field bus
The Key Pad control of NXVFD device is used for parameter setting, reading status data and giving control commands.
The NXVFD has to be configured to select field bus as control place before starting any of the operations through LonSpec. This configuration can be performed using the Key Pad control provided along with device as follows:
- In the keypad, from the main menu, select the menu called Keypad Control.
- Select the submenu Control Place and set it to “FieldBus”.
Note: None of the values sent (through field bus), by LonSpec will be considered until and unless the device is configured with field bus as control place.
The NXVFD can be configured to select the frequency reference from following different sources:
- AI1
- AI2
- Keypad
- Fieldbus
It is mandatory to set the option to “Fieldbus” for NXVFD to consider the frequency setpoint from LonSpec.
This configuration can be performed using the Key Pad control provided along with device as follows:
- In the keypad, from the main menu, select the menu called Parameters.
- Select the submenu I/O Reference and set it to “FieldBus”.
NX VFD device supports the following types of applications.
- Basic Application
- Standard Application
- Local/Remote Control Application
- PID Control Application
- Multi-Step Speed Control Application
- Multi-Purpose Control Application
- Pump And Fan control Application
The basic control interface and the parameters are easy to use. If a more versatile interface or parameters are required, a more suitable application can be selected from above application package.
Control I/O boards, which are either isolated (NXOPTA8) or not isolated ((NXOPTA1) from the ground are available.
The used I/O can also be extended by the LONWORKS option board:
- Eight digital inputs (standard signals)
- Eight digital outputs (standard signals)