Variable speed starters provide reliable & efficient control

27th November 2014
Posted By : Barney Scott
Variable speed starters provide reliable & efficient control

Combining the simplicity of a conventional fixed-speed starter with the ability to vary the speed of the motor, Eaton has developed an innovative motor control option, the Variable Speed Starter (VSS). Eaton’s PowerXL DE1 products are the first VSSs to reach the market, and provide machine and system builders with a highly reliable, energy-efficient and cost-effective alternative for motor control.

Eaton’s VSSs ensure compliance in constant-speed applications where IE2 motors have to be used as IE3 motors cannot be physically accommodated. VSSs also provide significant benefits where very high start frequencies or high thermal loads are involved.

PowerXL DE1 VSSs are available in 45mm wide slim-line versions, suitable for use with motors up to 1.5kW, or 90mm models which can be used with motors from 2.2 to 7.5kW. Both models offer internal motor protection, as well as motor thermistor and short-circuit protection.

No specialist knowledge is needed to install, commission and use the VSSs, as they have been designed for straightforward ‘out of the box’ operation without the need for adjustments or parameter setting. This means that they require up to 80% less commissioning time than conventional Variable Speed Drives (VSD).

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. The units provide a DC braking function prior to start up, which is particularly useful in fan applications. The VSSs feature the ability to reduce switching frequency to ensure that critical device temperatures are not exceeded, and an automatic restart function ensures continuous motor operation after a fault.

While the standard settings will be suitable in the vast majority of cases, Eaton offers a universal plug-in configuration tool, for specific applications, 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 SmartWire-DT wiring system, which cuts panel wiring time by up to 70% compared with conventional wiring.

Designed for use in even the most demanding of industrial environments, PowerXL DE1 VSSs operate in the temperature range of -10 to +60°C. Complying with CE, UL, cUL and cTick requirements, the devices are suitable for use worldwide.

“The energy-related products directive and the growing levels of machine automation are leading to the increased use of variable speed drives, even in comparatively simple applications,” said Guido Kerzmann, Product Line Manager, Eaton. “In many of these applications, however, particularly those involving pumps and fans, VSDs offer too much complexity and functionality, but ordinary motor starters provide no control over speed. Our VSSs are the ideal solution for these applications where only limited functionality is needed, as they are very simple to use, yet they offer full speed control.”


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