Vacon are world-renowned specialists in the field of AC drives in a variety of shapes and forms in the power range from 0,25 kW to 3 MW. The Vacon concept of modularity is unique, providing, inter alia, three different control units, two cooling methods for power units, room for five different I/O cards and field-installable conversion kits, all of which can, to a degree, be mixed and matched.
Vacon NXL
NXL is a slim, space-saving series for the power range from 250 W to 30 kW. They are easy to program and use. In addition to the standard I/O in the basic drive, there is room for one option card with more I/O or other functionality. Parameter setting is performed either via the seven-segment LCD panel or with a PC and NCDrive software.
Vacon NXS & NXP
NXS is designed as a standard, easy-to-use drive for a wide range of applications, while the Vacon NXP is used wherever a very high precision of speed and torque under all circumstances are required. The NXS is based on an advanced sensorless vector control concept, providing very good motor control, while the NXP features high processing power, using information from an encoder or a resolver to provide precise motor control.
Vacon NXS and NXP control units can be detached from the power units and mounted elsewhere. The NXS control is designed for typical industrial applications that do not require the precision provided by a feedback device.
The power unit of the drive is available in either an air-cooled or a liquid-cooled version. The I/O cards can be used in all three drive types: one I/O card in the NXL to expand the basic I/O, and up to five I/O cards in the NXS and NXP to create the necessary I/O configuration for your application. The NXP also supports sensorless vector and normal U/f control.
Detachable keypads
The NXS and NXP have a detachable, remote-operation alphanumeric keypad with built-in memory. It is used to communicate with the drive, to set parameters and for monitoring. It can copy parameters between different drives and is capable of storing the active parameter set automatically for future use.
An automatic torque maximiser feature is available on the NXS, which ensures that all loads can be started reliably. Also included is an automatic energy-saving feature, which optimises the motor flux as a function of motor load and speed.
Typical high-performance applications of the NXP are master-slave drives, positioning applications, winder tension control, and synchronisation.
Control unit can also run off 24 V
Vacon NX control units are usually supplied by the power unit. They can be powered from an external 24 V supply, making it possible to use the Fieldbus communications and to read data even when the main supply is off.
Vacon NXdrive is a pre-engineered single-drive enclosure series for currents from 385 A (300 to 500 V) and from 261 A (525 to 690 V). Basic power units of the larger frames are designed as IP00 modules, requiring an enclosure, which can be supplied either by Vacon or by any independent system integrator.
Compact and flexible, the NXdrive offers a large number of pre-designed options, typically fuses, switches, breakers and filters, or control options. It is user-friendly, with an NXP control unit completely separated from the power module and mounted in a separate control compartment at an easily accessible height.
Fully-tested, with special care being taken with temperature management to ensure long life for the enclosed drive, EMC performance is also verified, providing trouble-free operation in an industrial environment. Power modules are mounted on extendable rails raised to facilitate servicing.
The NXdrive can incorporate a variety of options, such as input fuses, breakers, contactors, switches and a selection of output filters, to provide the exact drive needed.
Liquid cooling
The modular construction of the Vacon NX range has also made it possible to develop liquid-cooled power sections as an alternative to the standard air-cooled range. As no air channels are required, the drives are extremely compact and suitable for all applications where space is at a premium - typically on ships and in offshore industries, in mines and also in heavy industry. Space savings, when compared to only the power module of a similarly rated air-cooled drive can be as high as 70%.
As almost all of the heat generated is removed in the coolant, a high degree of protection is readily achieved at all power ratings. Liquid-cooled Vacon drives have a power section designed from the start for liquid cooling - instead of the general practice of merely replacing an air-cooled element with a liquid-cooled unit.
For more information contact Rob Hare, CHI Control, +27 (0) 11 827 9124, [email protected], www.chicontrol.co.za
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