Gefran UK is launching a new range of high-performance sensorless ac variable speed drives in two package sizes covering 0.37kW to 2.2kW that deliver full torque at standstill.

After performing a static auto-tune routine with simple motor nameplate data for rated motor voltage, current and frequency, the Quix GV employs its patented 3GV open-loop motor control technology to deliver 100per cent torque at 0.0Hz.

Furthermore, the vector control algorithm optimises dynamic response, energy saving and torque delivery in real-time, continually tracking motor inductance, resistance, current and power factor levels under dynamic application conditions.

With just 14 basic parameters required for fast set-up, the Quix GV drive may be programmed via its integral keypad, RS485 serial port or wirelessly from a PDA equipped with Windows CE and Gefran's Quixstore PDA software – which is available free of charge from Gefran’s website. This feature allows parameter sets to be stored as Pocket PC files and simply edited using the integrated graphical interface.

With the ability to use full and meaningful parameter descriptions, programming is simplified and the infrared data transfer method is fast and accurate, saving time and improving quality in the machine build process.

The Quix GV’s infrared programming feature functions through transparent screen materials and is particularly suitable for machine commissioning through enclosure windows. This programming method facilitates multi-language operation and off-line parameter editing and there is also a monitor mode to provide real-time motor feedback information in addition to manual control for start-stop, speed, etc. The Quixstore CE PDA is also a portable programming package for the range.

The Quix GV range uses up-to-the-minute production techniques and the latest component technologies to provide some of the highest power-to-size ratios available for ac motor drives today. In particular the Size1, 1.5kW model, measuring just 155x80x130mm (hxwxd), is claimed to have the smallest enclosure size in its class. Two modular and attractive model sizes cover continuous power ratings from 0.37kW to 2.2kW with single-phase supplies between 220-240V with a supply frequency from 48Hz to 62Hz. A generous overload protection of 150percent for 60sec (175percent for 2sec) combined with Ixt protection above 100percent current, and many other safety features make the Quix GV well-matched for the most demanding applications in processing and automation.

With smooth operation from zero up to 2kHz output frequency, torque control is ultra-fast and suited to all types of variable speed drive requirements ranging from high starting torque for heavy industrial machinery, pulse loading for rapid and irregular speed change cycles, to smooth torque delivery requirements for critical speed-based applications.

With both RS485 and irDA interfaces, the QuixGV can provide low-bandwidth Master-Slave and drive-to-drive communication using the proprietary Quixbus Plus protocol where a Quixstore CE or customer-supplied PDA can be used for individual drive commissioning, even where the drives are connected through an RS485 network. For high-bandwidth networks to intelligent controllers, up to 63 Quix drives may be connected via Modbus RTU on RS485 using an optional controller module, the Quixport Plus or from a Windows PC running the Quixstore plus software. For Profibus, DeviceNet and Lonworks fieldbus communication networks a gateway is available allowing multiple Quix drives to be addressed, controlled and monitored.

The QuixGV is also available with an IP55/NEMA12 enclosure for use in food and beverage processing, chemical and water treatment, etc.

For more information, visit www.gefran.it