Products Drives & motors Inverter range has a safe torque off input feature
Mitsubishi Electric’s E700 series inverter is now available with a safe torque off input, eliminating the need for a redundant contac- tor in installations seeking com- pliance with EN954-1 Cat.3 and IEC60204-1 Stop Category 0. Denoted by the characters ‘SC’ after the ampere rating in the model number, this is 6mm deeper than the existing version across the power range, and is compatible with both connectiv- ity and I/O option cards when
utilising kits created for the safe torque off model.
The product is suitable for OEMs and end users who have constant or variable torque loads. Features include motor friendly soft PWM (pulse width modula- tion) switching, a self diagnostic mode, advanced flux vector con- trol, and a flux optimisation mode. Mitsubishi Electric Europe T: 01707 276100
Enter 239
http://automationsolutions.
mitsubishielectric.co.uk
External control option added to decentralised inverter An external 24V control input
option has been added to NORD Drivesystems’ entry level SK2x0E motor mounted decentralised inverter. This option allows the possibility for inverter parameter set-up without mains power, and control availability – including position interrogation – under power failure conditions where a backup supply can be used. The comprehensive and perfor- mance graded SK2xxE product series is directly mounted to a wide choice of NORD standard or high efficiency IE2 and IE3 rated motors and gearmotors, or supplied as near-motor panel mounted drives.
Features of the inverter include power ratings from 0.25 to 7.5kW,
from single and three phase supplies, and an advanced sensorless current vector drive with a broad selection of standard and optional control and fieldbus communications. The modular and scal- able inverter allows users to select only those options that are necessary for their application. Entry level built-in features include Class A line filter- ing, EEPROM parameter storage, brake management, encoder feed- back and basic positioning con- trol. A status and diagnostics console provides I/O status LEDs and RS232/485 communications interfacing. Version options include an AS-I interface with a
Robust and efficient motor range launched
New from ABB is a motor based on a rotor design, which offers both high efficiency and high power output. Using synchronous reluctance technol- ogy, the new motor is robust and has practically no losses. The motor is offered as a complete package with a frequency converter and dedicated software in two configurations, one that maximises efficiency, the other that maximises output.
‘Safe-Stop’ protocol providing EN954-1 compliant safety. More advanced features are avail- able through direct program- ming or with exter- nally mounted control box options, the company explains. The SK2xxE product series also includes a selection of expansion card options called Technology Boxes that extend the capability to include Profibus, CANopen and DeviceNet for direct parameter adjustment as well as expanded machine I/O. NORD Gear T: 01235 534404
www.nord.com
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The high efficiency package meets the most stringent efficiency level specified by the IEC; class IE4, super premium efficiency. For customers, this means 40% less energy losses than a conven- tional motor, claims the company. The second motor-drive package is said to offer a power density up to 40% higher than in a conventional induction motor. As a result, the motor size can be up to two frame sizes smaller. Because the rotor runs cooler than other tech- nologies, the bearings also run much cooler, making the motor more reliable. Juha Silvennoinen, head of ABB’s motors and generators business unit, said: “The new rotor is a break-through in motor technology, an achievement that makes it possible to make motors that are much more efficient and smaller than conventional induction motors.” ABB
www.abb.co.uk/energy T: 01925 741111
Enter 241 Variable speed drives help with a carbon reduction scheme
E nclosure manufacturer Rittal is committed to carbon reduction, and has undertaken a number of projects at Rittal-CSM, its manufacturing subsidiary plant in Plymouth, to reduce energy usage and emissions. As part of this, the company identified a possible area of inefficient energy use with its paint plant circulating and paint spray pump sets. Each pump set ran at a fixed speed using conventional control gear, with both the flow rates and spray head volumes controlled using manual valves. An energy audit discovered that the fixed speed operation of the pumps was inefficient, and the company realised that variable speed control was needed on the pump motor. As a result, the company
approached an inverter supplier and selected a single WEG CFW-11 VSD unit for installation on one of the motors as a trial. Although the trial proved successful over a number of months, the company ran into problems when retrofitting the remainder of the pump motors, so turned to installer Drew & Co. Andrew Botterill from the company commented: “After consultation with the client, it was decided to install 10 WEG CFW-11 variable speed drives, ranging from 3KW to 45KW, on the pump motors. Each variable speed drive was positioned in an IP65 Rittal enclosure with forced ventilation and filtering, adjacent to its respective pump.”
Drew & Co carried out all the control panel modifications and on site installation works during a single plant shutdown over a weekend. The installation of the new system meant that all the manual valves, which were used previously for pump output control, were opened fully and control was taken over by the WEG VSD. Each drive is set up with a simple local speed control, enabling the plant operators to set the optimum flow and volume for its particular application. As a result of the new drives, substantial reductions in energy con- sumption have been achieved, and this has been logged through an intelligent metering system and data capture software. The paint plant energy consumption was recorded over a number of months prior to and after the fitting of the VSDs.
The expected payback for this project is expected to be just a few months, with all the energy savings after this contributing to reducing the cost of the operation. WEG Electric Motors
T: 01527 596748 34
Enter 242 OCTOBER 2011 Design Solutions 1971-2011
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