ALx系列 直流电子负载
The ALx Series MagnaLOAD utilizes conventional linear MOSFET-based dissipative elements, allowing the series to achieve a very wide voltage-current operating range within the model’s maximum power rating. Using the same heat management innovations developed for Magna-Power’s high density programmable DC power supplies, the ALx Series’ conservative cooling ensures long product life with continuous full power operation in environments up to 50°C ambient operating temperature.
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 ALx 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 DC input bus is disconnected via a switching device.
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 ALx Series MagnaLOADs come with many configurable control modes, including:
- Voltage Mode
- Current Mode
- Power Mode
- Resistance Mode
- Shunt Regulator Mode
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 ALx Series MagnaLOAD DC electronic loads 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 40 commands are provided, with detailed documentation in the ALx Series User Manual.
Finally, Magna-Power's MagnaWEB software is provided allowing for web browser based control.
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");
Wide Full-Power Operating Range
The ALx Series uses MOSFETs for power dissipation, delivering among the industry's widest full-power operating for its product class. The ALx Series uses MOSFETs operated in the linear region to allow full power and full control over the entire VA rating of the product.
MOSFETs are specifically selected based on their ability to operate in the linear region and have safe operating curves well below the maximum power rating when used as an electronic switch. Control circuitry for ALx Series MagnaLOADs are operated in a closed loop to linearize the response. Each MOSFET device produces a load current defined by VC/Rn. Closed loop amplifiers enable multiple MOSFETs to share load current equally.
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 6 different models in the ALx Series spanning power levels: 1.25 kW, 2.5 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 |
|---|---|---|---|---|---|
| ALx1.25-200-300 | 1.25 kW | 200 Vdc | 300 Adc | Rack-mount | 2.5 Vdc |
| ALx1.25-500-125 | 1.25 kW | 500 Vdc | 125 Adc | Rack-mount | 6.0 Vdc |
| ALx1.25-1000-37.5 | 1.25 kW | 1000 Vdc | 37.5 Adc | Rack-mount | 7.5 Vdc |
| ALx2.5-200-600 | 2.5 kW | 200 Vdc | 600 Adc | Rack-mount | 2.5 Vdc |
| ALx2.5-500-250 | 2.5 kW | 500 Vdc | 250 Adc | Rack-mount | 6.0 Vdc |
| ALx2.5-1000-75 | 2.5 kW | 1000 Vdc | 75 Adc | Rack-mount | 7.5 Vdc |
Operating Profile
With its sole use of linear elements for heat dissipation, the ALx Series has the widest operating profile of the MagnaLOAD products. This operating profile figure applies to all ALx Series models, normalized about the model’s maximum voltage, current, and power ratings.
Specifications
Diagrams
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| Article Title | Category |
|---|---|
| Product shipping weights and dimensions | Logistics |
| Export classification code and harmonized tariff code | Logistics |
| Instrumentation Programming with Python | Programming |
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 ALx Series is 4 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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