Serie WRx Carico elettronico DC
Utilizing Magna-Power's patented Active Resistance Technology (US Patent 9,429,629) in combination with the company’s internally manufactured microchannel water-cooled heatsinks, the WRx Series addresses high power DC applications where exhaust heat control is essential. The WRx Series greatly increases power density compared air-cooled alternatives. An integrated solenoid controls the flow of water to avoid condensation. Full power can be achieved using conventional water, with water inlet temperatures up to 25°C.
Magna-Power's Active Resistance Technology utilizes a switched binary matrix of resistances and MOSFET network, combined with Magna-Power's new MagnaLINK™ distributed DSP architecture, the WRx Series delivers the same features and performance as traditional electronic loads, at a fraction of the price. In addition to the 16-bit precision voltage, current, resistance, and power control modes, the WRx Series also provides a rheostat control mode, allowing direct control of the product's internal resistance network.
Overview
MagnaLINK™ Distributed Digital Control
Magna-Power’s MagnaLINK™ technology provides distributed Texas Instrument DSP control across power processing stages inside the MagnaLOAD DC electronic load. This technology follows a significant internal development cycle from Magna-Power to provide a unified digital control platform across its electronic loads and power supplies, featuring fully digital control loops, adjustable control gains, programmable slew rates, digital master-slaving, and many new advanced control technologies.
All WRx Series MagnaLOADs come with the following interfaces:
- Front panel knob, keypad, and menu system
- 25-pin configurable external user I/O, including a high-speed analog input
- Front and rear USB and rear RS-485 or optional Ethernet and IEEE-4888 GPIB
When in standby or diagnostic fault, the AC mains are mechanically disconnected by an embedded AC contactor, providing confidence that the unit is only processing power when desired.
Finally, with a dedicated +5V interlock input pin and included +5V reference on all models, external emergency stop systems can be easily integrated using an external contact.
Flexible Operating Modes
To accommodate a variety of DC sources, all WRx Series MagnaLOADs come with many configurable control modes, including:
- Voltage Mode
- Current Mode
- Power Mode
- Resistance Mode
- Shunt Regulator Mode
- Rheostat
Preference for DC regulation is given to the parameter in the selected mode within the programmed set-points. Using the MagnaLOAD's set-points and trip settings, the product can configured to either trip with a fault when a limit is exceeded or to cross-over into a different regulation state.
Shunt Regulator Mode turns the MagnaLOAD into a high-speed smart braking resistor, engaging the DC input only when a specified voltage and exceeded by a user-defined percentage, while limiting the shunt current to a programmed set-point.
Digital Master-Slaving: Expandibility Without Compromise
All MagnaLOADs come standard with a MagnaLINK™ Input and a MagnaLINK™ Output port, which provides plug and play digital master-slaving. Simply connect the master's MagnaLINK™ Output to the slave's MagnaLINK™ Input and, using the MagnaWEB software, the products will automatically configure themselves for master-slave operation as a higher-power unit based on the populated ports. Buffered digital MagnaLINK™ connections means many MagnaLOADs can be daisy-chained in master-slave operation. Master-slave MagnaLOAD units will aggregate measurements to one display panel.
The internal MagnaLINK™ protocol was developed with expandability at the forefront. When configured for master-slave operation, the master controller takes control of all the slave's digital "targets." With this digital master-slaving strategy, it is completely transparent whether the unit is operating as a stand-alone product or in master-slave.
Configurable External User I/O
Beyond the front panel and computer controls, all MagnaLOADs come standard with a 25-pin D-Sub connector designated as the External User I/O. This connector provides:
- 8 Digital Outputs
- 4 Digital Inputs
- 4 Analog Outputs
- 4 Analog Inputs
All the analog-digital I/O ports are configurable, allowing the user to select which parameters they want to control and monitor. This configurable I/O scheme reduces complexity, eases PLC integrationand allows control parameters from various interfaces simultaneously.
The MagnaLOAD's configurable analog inputs provide 0-10V programming from PLCs and external D/A converters.
MagnaWEB Software Interface
Magna-Power's next generation software interface, MagnaWEB, provides intuitive and user-friendly web-browser based controls for programming and measurement read-back of the MagnaLOAD's activity. Virtually all of the MagnaLOAD's available functions can be controlled and monitored from the MagnaWEB software over any of product's installed communication interfaces.
MagnaWEB uses a server-client software model to provide access to the MagnaLOAD from nearly any device and operating system. Install and run the MagnaWEB software locally on Windows then, using a web browser, access the server connected to the MagnaLOAD from a variety of devices including other desktops, tablets or smart-phones.
Extensive Programming Support
All WRx Series MagnaDC power supplies come with a dedicated National Instruments LabVIEW™ driver, Interchangeable Virtual Instrument (IVI) driver, and support for a wide range of Standard Commands for Programmable Instrumentation (SCPI). These programming interfaces support full control, measurement, and monitoring of the MagnaLOAD. All of the MagnaLOAD's available communication interfaces are supported by these drivers and command sets, including: USB, RS-485, LXI TCP/IP Ethernet, and IEEE-488 GPIB.
Showcased in the following basic code examples, SCPI commands provide the simplest form of communication by using plain ASCII text and parameters sent over a basic socket connection. Over 50 commands are provided, with detailed documentation in the WRx Series User Manual.
Finally, Magna-Power's RIS Panel software is provided allowing for a virtual control panel controlling the power supply via any of the available communication interfaces
import visa
rm = visa.ResourceManager()
magna_power = rm.open_resource(USB::0x0403::0x6015::1201-2358::INSTR)
magna_power.write('*IDN?')
magna_power.read()
magna_power.write('VOLT 1000')
magna_power.write('CURR 20')
magna_power.write('INP:START')
magna_power = visa('ni','USB::0x0403::0x6015::1201-2358::INSTR');
fopen(magna_power)
fprintf(magna-power,'*IDN?')
idn = fscanf(magna_power)
fprintf(magna-power,'VOLT 1000')
fprintf(magna-power,'CURR 20')
fprintf(magna-power,'INP:START')
string resourceString = "USB::0x0403::0x6015::1201-2358::INSTR";
mbSession = (MessageBasedSession)ResourceManager.GetLocalManager().Open(resourceString);
string idn;
mbSession.Timeout = 3000;
idn = mbSession.Query("*IDN?");
mbSession.Write("VOLT 1000");
mbSession.Write("CURR 20");
mbSession.Write("INP:START");
Active Resistance Technology: A New Era for Electronic Loads
The WRx Series utilizes Active Resistance Technology to deliver performance consistent with conventional electronic loads, but at a fraction of the price and with the ability to directly switch passive resistors on-the-fly.
In Magna-Power's Active Resistive Technology, switched resistors are placed in series with MOSFETs. High-performance DSPs simulatenously control both dissipation elements in harmony. Assuming the power across the shunt resistor is insignificant, the power dissipated in load resistor R1 is IL x VR1 and the power dissipated in MOSFET Q1 is IL x VQ1. The resistors can be operated at higher temperatures than the MOSFETs, simplifying cooling requirements of the passive elements. Keeping VQ1 small and VR1 large lowers system costs in comparison with purely semiconductor electronic loads. Adjusting the value of resistor R1 is accomplished with a binary switching matrix. Finally, keeping the resistor switching increments small and over a wide range maintains the smallest voltages across the linear modules and over the widest operating range.
The advantage of resistive loads are reliability and cost per watt for dissipating power, while the advantage of MOSFET loads is speed of performance and the ability to dissipate power over a wide operating range. Active Resistive Technology blends switched resistance with MOSFETs to significantly lower the product's cost, add new control modes, while still delivering 16-bit precision and high-accuracy performance
Front Panel - Standard
Front Panel - Blank Panel (+BP) Option
Designed and Manufactured in the USA, Available Worldwide
For complete control of quality, MagnaDC programmable DC power supplies are designed and manufactured at Magna-Power's vertically integrated USA manufacturing facility in Flemington, New Jersey. Heat-sinks and chassis are machined from aluminum. All sheet metal is fabricated and powder coated in-house. Magnetics are wound-to-order from validated designs based on a model's voltage and current. An automated surface-mount production line places components on printed circuit boards for control, driver, auxiliary power, and display circuits. And finally after assembly, products undergo comprehensive test and calibration, followed by an extended burn-in period.
Models
There are 15 different models in the WRx Series spanning power levels: 12.5 kW, 25 kW, 50 kW, 75 kW, 100 kW.
Use the following ordering guide and models chart to define the best model for your application.
| Model | Maximum Power | Maximum Voltage | Maximum Current | Package Type | Minimum Voltage |
|---|---|---|---|---|---|
| WRx12.5-200-130 | 12.5 kW | 200 Vdc | 130 Adc | Rack-mount | 2.5 Vdc |
| WRx12.5-500-52 | 12.5 kW | 500 Vdc | 52 Adc | Rack-mount | 3.0 Vdc |
| WRx12.5-1000-26 | 12.5 kW | 1000 Vdc | 26 Adc | Rack-mount | 5.0 Vdc |
| WRx25-200-260 | 25 kW | 200 Vdc | 260 Adc | Floor-standing | 2.5 Vdc |
| WRx25-500-104 | 25 kW | 500 Vdc | 104 Adc | Floor-standing | 3.0 Vdc |
| WRx25-1000-52 | 25 kW | 1000 Vdc | 52 Adc | Floor-standing | 5.0 Vdc |
| WRx50-200-520 | 50 kW | 200 Vdc | 520 Adc | Floor-standing | 2.5 Vdc |
| WRx50-500-208 | 50 kW | 500 Vdc | 208 Adc | Floor-standing | 3.0 Vdc |
| WRx50-1000-108 | 50 kW | 1000 Vdc | 108 Adc | Floor-standing | 5.0 Vdc |
| WRx75-200-780 | 75 kW | 200 Vdc | 780 Adc | Floor-standing | 2.5 Vdc |
| WRx75-500-312 | kW | 500 Vdc | 312 Adc | Floor-standing | 3.0 Vdc |
| WRx75-1000-156 | 75 kW | 1000 Vdc | 156 Adc | Floor-standing | 5.0 Vdc |
| WRx100-200-1040 | 100 kW | 200 Vdc | 1040 Adc | Floor-standing | 2.5 Vdc |
| WRx100-500-416 | 100 kW | 500 Vdc | 416 Adc | Floor-standing | 3.0 Vdc |
| WRx100-1000-208 | 100 kW | 1000 Vdc | 208 Adc | Floor-standing | 5.0 Vdc |
Operating Profile
With its combination of resistor and linear elements, the WRx Series DC electronic load provides two distinct operating profiles: High Power Range and Low Power Range.
The operating profiles figures below apply to to all WRx Series models, normalized about the model's maximum voltage, current, and power ratings.
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Application Notes
How to Buy
In the USA and Canada, Magna-Power sells it products directly from the factory, with a North American network of technical representatives. Magna-Power products are available worldwide through direct sales offices and authorized distributors. Requests from this form will either be quoted directly or automatically routed to the appropriate sales partner for quote.
Build-time
Magna-Power products are made-to-order with build-times that vary depending on the model's maximum power rating. The current build-time for the WRx Series is 8-12 weeks.
Sales Partners
In the USA and Canada, Magna-Power sells it products directly from the factory, with a nationwide network of technical representatives. Magna-Power products are available available worldwide through direct sales offices and authorized distributors. Requests from this form will either be quoted directly or automatically routed to the appropriate sales partner for quote.
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