DRIVES, CONTROLS & MOTORS FEATURE
Variable speed starter option for motor control
P
ower management company Eaton has
developed a new option for motor control – the Variable Speed Starter (VSS). The new VSS combines the simplicity of a conventional fixed- speed starter with ability to vary the speed of the motor. VSSs, of which Eaton’s new PowerXL DE1 products are the first to reach the market, provide machine and system builders with a highly reliable and cost- effective alternative for motor control that will be particularly useful for helping them to increase energy efficiency in applications where fixed-
speed starters were previously used. Eaton’s VSSs also offer a solution to ensure standards
compliance in constant-speed applications where IE2 motors have to be used as IE3 motors cannot be physically accommodated. Other applications where VSSs provide significant benefits include those involving very high start frequencies and those where there is a high thermal load on the motor. Eaton is currently offering PowerXL DE1 VSSs in two sizes; the 45mm wide slim-line version is suitable for use with motors up to 1.5kW, while the 90mm wide model can be used with motors from 2.2 to 7.5kW. Both models have internal motor protection functions as well as motor thermistor and short- circuit protection.
No specialist knowledge is needed to install,
commission and use the new VSSs, as they have been designed for straightforward ‘out of the box’ operation without the need for adjustments or parameter setting. Eaton PowerXL DE1 VSSs have been specifically designed to provide maximum availability. They offer, for example, trip-free operation that detects regenerative energy fed back from the motor and automatically allows for this. They also provide a DC braking function prior to start up, which is particularly useful in fan applications, and they have the ability to reduce switching frequency to ensure that critical device temperatures are not exceeded. An automatic restart function ensures continuous motor operation after a fault. While the standard settings will be suitable in the vast majority of cases, for special applications Eaton offers a universal plug-in configuration tool that allows key parameters, including ramp time, motor protection and terminal arrangement, to be set using no tools other than an ordinary screwdriver. Alternatively, the PowerXL DE1 VSSs can be configured using external keypads with an LED or OLED display and buttons, or the Eaton drives Connect software. Parameters can also be copied from one device to another via Bluetooth. PowerXL DE1 VSSs have a Modbus interface as standard, and they can be easily integrated with Eaton’s innovative SmartWire-DT wiring system, which cuts panel wiring time by up to 70 percent compared with conventional wiring. Designed for use in even the most demanding of industrial environments, PowerXL DE1 VSSs have an operating temperature range of -10ºC to +60ºC.
Eaton Electric
www.eaton.uk.com/electrical T: 0161 655 8900
Enter 214 ULTRACOMPACT WATER-COOLED MOTORS SAVE SPACE
WEG has introduced ultracompact water-cooled motors which enable engineers to save space by delivering the same power in a frame size one or two times smaller than ordinary water-cooled motors. Designed by WEG’s new subsidiary, AKH (Antriebstechnik KATT Hessen), acquired in late 2014 to strengthen WEG’s expertise in special electric motors, the UTTW and USTW series motors feature a patented cooling system and are claimed to offer 1.5 to 2.6 times the power density of conventional water-cooled motors, ensuring reduced heat dissipation and thus a smaller frame size. These characteristics enable them to achieve high torque and maximum speed of up to 12,000rpm in a very small package.
With saving space and reducing energy top of the manufacturing agenda, especially when it comes to applications such as mobile machinery and test equipment as well as machine tools, shipboard equipment and agricultural and forestry machinery. With this in mind, AKH water-cooled motors feature a cooling system - with cooling elements integrated into the stator laminations - which allows the dissipated heat to be removed directly at the source. This feature dramatically reduces the size and weight of the motor by eliminating the concentric steel tubes of the water jacket surrounding conventional water-cooled motors. For example, an AKH water-cooled motor with 300kW rated power in frame size 180 (type UTTWp 180.4-4) is equivalent to a conventional motor with water jacket cooling and the same rated power in frame size 315.
WEG
www.weg.net/uk T: 01527 513800 /AUTOMATION Enter 215 Enter 18
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