Power management company Eaton offers Dumeco DC switch-disconnectors to help solar PV equipment manufacturers and installers gain a competitive edge within the increasingly significant solar power market. These innovative products stand alone as cost-effective, reliable and safe solutions; they also integrate efficiently and easily with matched Eaton components into a continuous channel that transports energy safely from the solar module to the power grid.

The DC switch-connectors are being made available in four frame sizes; the largest has 800 A, 1000 A and 1250 A options, while the smallest offers 63 A, 80 A and 100 A versions. Accordingly, the devices are suitable for applications ranging from residential and light commercial rooftop sites to large commercial and utility scale installations, as well as solar combiner box and inverter equipment.

This switchgear is available in 2-pole configurations that reduce the need for bridging links between the poles; this cuts installation time and copper costs. Bi-directional pole connection gives installation flexibility. The units’ minimal footprint of up to 52 per cent smaller than any competing product allows installation space savings. An independent manual operating mechanism controls special self-cleaning roller contacts which provide long term safety and reliability.

Operation is through either a direct handle or an extension shaft of up to 600 mm and handle for thru-the-door interlocking. IP65-rated grey or red/yellow K Line handles are available, with both padlock and cylinder lock versions. Door interlocking configurations include a ‘defeatable’ option in the ON position for fault finding. An auxiliary switch set is also available; this offers 1NO+1NC contacts.

The Dumeco DC switch-connectors are rated to 1000 V DC, are compliant with standard EN-IEC 60947-3 and have CE, CCC, RoHS and EAC certifications. They offer high short circuit ratings and operate to utilization category DC-21B. The units are suitable for base plate mounting.

This new range of DC switch-connectors is built to handle the most demanding of PV applications, while providing reliable isolation to ensure safe operation within an installation. Perfectly aligned with the robust Dumeco AC switch-disconnectors, it enables an excellent all-round AC/DC package. The products offer an attractive solution to distributors, installers and manufacturers due to their competitive pricing, cost-saving features, proven reliability and compact, flexible design. They form part of Eaton’s comprehensive global portfolio that serves the renewable energy segment.

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A New Species

The new Variable speed starter (VSS) from Eaton offers alternatives for drive engineering

The increasing automation of machines and the increasing legal requirements with regard to energy efficiency have resulted in a significant rise in the demand for variable frequency drives. At the same time the motor starter has established a strong position on the market. In order to bridge the gap between the two, Eaton is now offering a new device class: the Variable speed starter (VSS).

Electrical speed control using variable frequency drives continues to gain importance. The Motor Regulation EC 640/2009 of the European Union is a driving force here, stipulating the mandatory use of IE3 motors directly on the grid or likewise the use of IE2 motors with variable speed drives from 2015. This means that there is an increasing move away from the motor starter towards the variable frequency drive, particularly with simple applications.

Benefits of the motor starter and variable frequency drive combined

There is clearly a gap between these two most widely used methods of controlling electric motors. One the one hand, there is the motor starter with its easy handling and high level of reliability and yet limited functionality. On the other hand, the variable frequency drive provides the required variable motor speed and a wide range of functions, but involves a greater degree of complexity. The move towards the variable frequency drive therefore presents many users with some challenges since it is a highly complex device and normally requires a comprehensive knowledge of drive engineering.

As a pioneer and one of the leading specialists for all aspects of switching, protecting and driving motors, Eaton has developed a new device class that combines the benefits of the motor starter with those of the variable frequency drive. The so-called Variable speed starter (VSS) can be handled as easily as a motor starter but offers the possibility of variable speed control at the same time.

Simplicity at first glance…

Eaton is launching the new device class under the product name PowerXL-DE1, first of all in two sizes. The slim-line FS1 version with a width of only 45 mm is ideal for controlling motors up to 1.5 kW, while the FS2, double the width at 90 mm, is designed for ratings from 2.2 to 7.5 kW. At first glance, these devices are the embodiment of simplicity.

Their attractiveness lies in the fact that there are no buttons and operating elements. This makes a simple “out-of-the-box” installation possible, i.e. the installer just has to take the device out of the box, wire it up like a motor starter, and it is already operational. The fact that the DE1 requires no parameter setting means that the probability of installation errors is kept to a minimum and therefore also the time required up to commissioning. Three LEDs indicate the status and operating mode of the unit at a glance. The table provided directly on the device gives a clear explanation of the color coding and flash frequency.

...impressive trip free design at second

Besides simple handling, Eaton has also integrated the aspect of reliability into the new device class. The trip free design of the Variable speed starter (VSS) ensures maximum availability. This concept comprises the ability of the DE1 devices to detect the regenerative energy feedback from the motor and to thus lengthen the ramp automatically. It also includes a DC braking function and the function of automatically reducing the switching frequency to prevent the device temperature from being exceeded. However, in the event that a fault causes the device to switch off, the automatic restart function makes it possible to ensure continuous motor operation. This means that the manual reset of the fault is no longer necessary providing that safety is not impaired.

The benefits of the trip free design are easily demonstrated in practical applications. Imbalance can be a genuine problem in many applications where centrifugal forces are present (e.g. industrial washing machines). On the one hand the motor must accelerate the load, whilst on the other hand, the imbalance mechanically accelerates the motor so that it runs faster than set by the variable frequency drive. This results in regenerative energy feedback into the DC link circuit. Normally the energy must be discharged via a braking resistor. The DE1 offers a refined alternative: An internal algorithm ensures that this does not increase the DC link voltage to impermissible values and thus initiate a shutdown – and all that without the use of a braking resistor.

Fans are another area of application. The air flow in a pipe system can mean that fans often rotate when the driving motor is not switched on. If a speed controller is then required to switch the motor that is already rotating, the controller may be switched off in certain circumstances on account of overcurrent. With these kinds of applications, the DE1 Variable speed starter (VSS) is able to brake the motor with DC current before the motor actually starts in order to prevent the unwanted shutdown. The device therefore ensures fault-free operation even here.

A large market gap

The variable speed starters are factory fitted with internal EMC filters so that they are suitable for use in industrial networks as well as in public utility grids (category C1, C2, C3) without the need for other external EMC filters.

With this unique performance profile and its design for ambient temperatures from -10 to 50 °C (60°C with derating) the Variable speed starter (VSS) meets the demands of several applications on the market for which there was previously no ideal solution. This includes, for instance, applications for which a DOL starter and star-delta starter combination or a soft starter cannot be used since the motor draws a large starting current but does not permit a reduced starting torque. This also applies to materials handling applications, when machines or crushers have to be started up at once under full load after a stop. Even for many simple applications, such as in the field of transport technology, regular variable frequency drives are often overdimensioned, i.e. too elaborate, too expensive and complex.

Many machine builders, who are required to move media such as air or liquids, are now challenged by the requirement of the ErP Directive to design a new drive concept for fans and pumps in order to achieve the prescribed minimum efficiency values. If they have previously used a motor starter and controlled the flow rate mechanically or hydraulically, such as with throttle valves, they are now faced with the challenge of switching to a power-dependent control through the possibility of variable speed adjustment.

The variable speed starter is also ideal for applications requiring a fixed speed that cannot be implemented with the mains frequency. This is often the case in the wood industry where motors are run at high speeds (e.g. 18,000 rpm). The DE1 also offers an alternative where a constant speed is required, but where an IE3 motor cannot be used due to the different mechanical dimensions compared to IE2 motors.

Operation options: Screwdriver to remote keypad

The variable speed starter also offer considerably more options than is seen at first and second glance. A pluggable and universal configuration module, the DX-EXT-SET, enables the operator to change the most important parameters from the factory setting with a screwdriver – without the need for a keypad, software or manual. This means that ramp times, motor protection, mains frequency and terminal configuration can be set ergonomically. Once the parameters have been set via the operating elements on the front, the configuration module can “mechanically store” this parameter set, which can then be transferred directly to other variable speed starters – simply by plugging onto the DE1 device and pressing the Set button. This function simplifies and speeds up commissioning in series production or when replacing a device in the event of a fault.

Eaton also offers users external keypads with LED or OLED displays, already known from the PowerXL series, for an alternative method of parameterizing and operating the DE1, as well as a Bluetooth communication stick for the simple copying of parameters from one device to others. Like all devices of the PowerXL series, the DE1 is also compatible with Eaton's drivesConnect software. This software and the keypads enable up to 63 devices (DE1, DC1, DA1) to be combined in a drive network and now operate and parameterize them centrally as stations of the network. The DE1 comes with a Modbus interface as standard and can also be integrated directly in Eaton's innovative SmartWire-DT communication system.

The new PowerXL-DE1 Variable speed starters (VSS) that comply with the international CE, UL, cUL and cTick requirements thus provide machine and system builders with a cost-effective and at the same time highly reliable alternative for worldwide use in order to make applications with a previously constant speed more energy efficient and in compliance with the increasing international legal requirements.

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Hylec-APL now offers the DE01 range of pre-installed control stations which combine tough IP67 enclosures with hard wearing push button and selector switches reducing time spent on-site. Installation is further aided thanks to unique, snap-on brackets for easy wall, chassis and DIN mounting.

*  Variety of sizes and depths to accommodate different application requirements
*  Thick walls constructed from robust ABS material
*  Up to IP67 protection depending on switch options
*  Snap-on bracket mounting available for DIN rail or chassis / wall mounting
*  Selection of push button and selector switch types and combinations are available
*  Suitable for indoor and outdoor use in domestic, commercial and industrial applications
*  All products comply fully with ROHS and REACH standards

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The revolutionary SmartWire-DT system from Eaton’s Electrical Sector, which virtually eliminates the need for conventional control wiring in panels and on machines, is now even more versatile and convenient. This follows the addition of devices with integral SmartWire-DT connectivity to two key product ranges – easy800 control relays and PKE motor-protection circuit breakers.

In many applications, easy800 programmable control relays with SmartWire-DT make it possible to implement sophisticated control systems without the need to use programmable controllers (PLCs), which means big savings in costs and complexity. In addition, Eaton’s easySoft-Pro software makes easy800 relays simple to program, even for users who have no specialist programming knowledge or experience.

The new easy800 relays are suitable for applications with up to 320 I/O and are programmed using straightforward and well-known ladder diagram techniques. The easySoft-Pro programming software now includes SmartWire Assist to configure external devices, allowing control systems that incorporate the new relays to be drawn, configured, programmed and tested using just this one intuitive software package.

Equally well suited for use in control systems based on easy800 relays, and those based on conventional PLCs, PKE motor-protection circuit breakers with SmartWire-DT allow users to monitor the operation of their motors in detail and in real time. The PKE units can report via the SmartWire-DT connection a wide range of operating parameters that include motor current, motor fault conditions and overload status. This is achieved without the need for additional hardware like current transformers and specialist relays, which are not only costly to buy, but are also inconvenient to fit and wire.

A key benefit of the information supplied by PKE units with SmartWire-DT connectivity is that, in many cases, it allows developing problems to be identified and addressed before a motor trip occurs, thereby greatly reducing downtime and costly production losses.

SmartWire-DT from Eaton is a powerful and versatile communications system that enables switching and control devices, such as contactors, circuit breakers and pushbuttons, as well as analogue I/O devices, to be connected quickly and simply using pre-fabricated plug-in cables. This saves time in building and testing control systems, as well as virtually eliminating the risk of wiring errors while greatly increasing the ease with which future modifications can be made.

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The expanded DRA Series now includes compact DIN Rail Mounted 3 Phase AC Solid State Contactors, 3 Phase AC Solid State Motor Reversing Contactors, and DC Solid State Motor Reversing Contactors!

Crydom introduces its expanded offer of DRA Series compact DIN Rail Mounted Solid State Contactors. Complementing existing single channel and four channel AC and DC output DRA Series, the new models include 3 phase UL approved AC output ratings of either 1 or 2 horse power at 480 VAC in both contactor and motor reversing configurations, and UL approved DC output ratings of ¼ horse power at 90 or 180 VDC. IEC 60947 ratings are available as well for both AC and DC output DRA Series.

DRA Series 3 Phase Contactors feature an SCR output all solid state design with 4000 VAC optical isolation, AC or logic compatible DC control inputs, both with input status indicator, UL approved motor and AC output resistive load ratings of either 2.4 or 4.2 amps per phase from 48 to 510 VAC. Motor reversing models also include a control interlock feature that allows only off, forward and reverse operation.

DRA Series DC Motor Reversing models feature a FET output all solid state design with 2500 VAC optical isolation, logic compatible DC control inputs with input status indicator, and UL approved motor and DC output resistive load ratings of either 6 A @ 180 V and 12 A @ 90 V.

Designed for easy mounting to standard 35 mm DIN Rail, the new DRA Series of 3 Phase AC and DC output Solid State Contactors and Motor Reversers are available in a variety of input and output ratings.

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A growing requirement for DC switch disconnectors for solar photovoltaic (PV) power supply systems has motivated Kraus & Naimer to introduce a brand new range of disconnectors specifically designed for this particular DC application.

With rated operational currents from 16 amps to 64 amps and voltages from 450 to 800 using a utilization category of DC-22A, a solution for most isolator applications within the solar photovoltaic market can be found.

Available in a totally insulated enclosure with the option of a red/yellow or grey /black padlockable handle and with a degree of protection to IP 66/67 they can be installed in the most arduous of environments.

To complement this series a complete range of AC switch disconnectors is also available in totally insulated enclosures, this enables the contractor to obtain his switch disconnector requirements for the entire installation from one source.

A new up to date catalogue giving part numbers and technical details is available on request.
http://www.krausnaimer.co.uk/photovoltaic-disconectors

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The new KF-series features exceptionally large isolation distances and offers high AC-23A motor ratings.  It covers the range from 16A to 32A and offers disconnect capability of up to 1000V according to IEC 947.  The rotary contact system incorporated in a new type of modular contact block allows high mechanical life expectancy and precise and reliable contact making.

The innovative modular system is both simple and very safe while offering enormous flexibility.  All available modules can be combined, exchanged or added in the field, as can the very precisely working cam-operated auxiliary contacts.  The position of the various modules in relation to each other
can be defined by the user or, if preferred, preassembled in the factory.

* Coupling profile determines pre-closing function of switched 4th pole,
  i.e. contact modules per se are always the same

* Rotating contact movement (instead of classical vertical lifting) allows
  big contact gaps
  high mechanical life expectancy
  very precise movement sequence
  self-cleaning contacts
  forced opening and closing of contacts

* Compact (very shallow) design

* Up to 1000V insulation voltage according to IEC possible

* Lateral drive possible (latching module not in the centre but on left or right hand side)

* Visible contacts (windows) available on request

* Design allows a big variation of terminal markings

* Removal from DIN rail can be done without tool change (screw driver for cross-recessed screws sufficient)

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With the newly designed G20 the "Knife contacts" have been designed in a new way resulting in a switching capacity of 20 Amps at 1000V DC (DC-22A) and high short circuit withstand capability.  Finger-proof terminals according to EN 50274 and protection degree IP20 offer maximum safety.

In combination with a standard latching mechanism, the G20 complies with all regulations required for main switches according to IEC/EN 60204.  In addition the G20 is also ideal for AC-applications with high short circuit fault levels, as well as electronic circuitry with low current and voltages.

Of course the G20 can also be combined with many optional extras from the Kraus & Naimer product line.

 * Self-cleaning and vibration resistant knife contacts

* Compact design

* High DC switching capacity

* Highest contact reliability (better than any H-bridge contact system)

* High short circuit withstand capability

* Finger-proof terminals (IP20) even if jumper links are used

* Terminal extensions (accessory item) for ring type cable lugs (max. width 6mm) and quick connect lugs will be made available

* Heat resistant contact system according to standard EN 12101-3

G20 - with normal latching
G20S - with snap-action latching

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Power without any doubts

Modern power supplies are a vital component in most areas of energy management and automation technology. The new CP-E range power supplies are the youngest members of the ABB power supply family. This range offers types with output voltages from 5 V DC to 48 V DC at output currents of 0.625 A to 3 A.

A high thermal efficiency corresponding with low power and heat dissipation, allow the operation without forced cooling. Functionality has been enhanced while the number of different types has been considerably reduced.

All power supplies of the new CP-E range are approved to all relevant world-wide standards (cULUS, IEC/EN 60950, etc.) and have both CE and C-TICK marks.

Characteristics of the CP-E range
• Output voltage 5 V, 12 V, 24 V, 48 V DC
• Adjustable output voltages
• Output current 0,625 A, 0,75 A, 1,25 A, 2,5 A, 3 A
• Power range 18 W, 30 W, 60 W
• Auto range input 100...240 V AC range (85...265 V AC, 90...375 V DC)
• High efficiency of up to 87...89 %
• Low power dissipation and low heating
• Free convection cooling (no forced cooling with ventilators)
• operating temperature range –10...+70°C
• Open-circuit, overload and short-circuit stable, automatic recovery
• Integrated input fuse
• U/I characteristic curve (fold-forward behaviour at overload – no shutdown) for devices > 18 W
• Redundancy unit CP-A RU offering true redundancy
• Status LED “OUTPUT OK”
• DC OK output (transistor) for 24 V devices (> 18 W)

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