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MagnaLOAD ALx Series Programmable Electronic DC Loads

MagnaLOAD ALx Series Programmable Electronic DC Loads

Magna-Power ALx Series
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.

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Product Details

MagnaLINK™ Distributed Digital Control


MagnaLINK Digital Control Image

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

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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
MagnaLOAD Control Modes

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.

MagnaLOAD Control Modes

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


MagnaLOAD 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


MagnaWEB Software

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


MagnaLOAD Standard Front Panel

Front Panel - Blank Panel (+BP) Option


MagnaLOAD Blank Front Panel
1
START: Enables the DC input bus
STOP: Disables the DC input bus
2
Voltage measurement display
3
Current measurement display
4
4-line character display featuring a menu system, operating status and modes, product messages with diagnostic codes, resistance measurement display, and power measurement display
5
Control power switch, energizes the control circuits without engaging DC bus
6
LED indicator that the DC input is enabled
7
Full control (host) front panel USB port
8
Clean air intake, with integrated fans
9
Aluminium digital encoder knob for programming set-points
10
LED indicator of the MagnaLOAD's present regulation state, which can include: constant voltage (CV), constant current (CC), constant power (CP), or constant resistance (CR)
11
Selector buttons to choose which set-point the digital encoder knob and digital keypad buttons will modify.
12
MENU: Enters the menu system on the 4-line display
BACK: Moves back one level in the menu
ENTER: Selects the highlighted menu item
CLEAR: Removes the product from a faulted state
LOCK: Locks the front panel, with password protection available
USA Flag

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.

There are 27 different models in the ALx Series spanning power levels: 1.25 kW, 2.5 kW, 5 kW, 7.5 kW, 10 kW, 12.5 kW, 15 kW, 17.5 kW, 20 kW.

Use the following ordering guide and models chart to define the best model for your application.

ALx Series Ordering Guide
ModelMaximum PowerMaximum VoltageMaximum CurrentPackage TypeMinimum Voltage
ALx1.25-200-3001.25 kW200 Vdc300 AdcRack-mount2.5 Vdc
ALx1.25-500-1251.25 kW500 Vdc125 AdcRack-mount6.0 Vdc
ALx1.25-1000-37.51.25 kW1000 Vdc37.5 AdcRack-mount7.5 Vdc
ALx2.5-200-6002.5 kW200 Vdc600 AdcRack-mount2.5 Vdc
ALx2.5-500-2502.5 kW500 Vdc250 AdcRack-mount6.0 Vdc
ALx2.5-1000-752.5 kW1000 Vdc75 AdcRack-mount7.5 Vdc
ALx5-200-12005 kW200 Vdc1200 AdcFloor-standing2.5 Vdc
ALx5-500-5005 kW500 Vdc500 AdcFloor-standing6.0 Vdc
ALx5-1000-1505 kW1000 Vdc150 AdcFloor-standing7.5 Vdc
ALx7.5-200-18007.5 kW200 Vdc1800 AdcFloor-standing2.5 Vdc
ALx7.5-500-7507.5 kW500 Vdc750 AdcFloor-standing6.0 Vdc
ALx7.5-1000-2257.5 kW1000 Vdc225 AdcFloor-standing7.5 Vdc
ALx10-200-240010 kW200 Vdc2400 AdcFloor-standing2.5 Vdc
ALx10-500-100010 kW500 Vdc1000 AdcFloor-standing6.0 Vdc
ALx10-1000-30010 kW1000 Vdc300 AdcFloor-standing7.5 Vdc
ALx12.5-200-300012.5 kW200 Vdc3000 AdcFloor-standing2.5 Vdc
ALx12.5-500-125012.5 kW500 Vdc1250 AdcFloor-standing6.0 Vdc
ALx12.5-1000-37512.5 kW1000 Vdc375 AdcFloor-standing7.5 Vdc
ALx15-200-360015 kW200 Vdc3600 AdcFloor-standing2.5 Vdc
ALx15-500-150015 kW500 Vdc1500 AdcFloor-standing6.0 Vdc
ALx15-1000-45015 kW1000 Vdc450 AdcFloor-standing7.5 Vdc
ALx17.5-200-420017.5 kW200 Vdc4200 AdcFloor-standing2.5 Vdc
ALx17.5-500-175017.5 kW500 Vdc1750 AdcFloor-standing6.0 Vdc
ALx17.5-1000-52517.5 kW1000 Vdc525 AdcFloor-standing7.5 Vdc
ALx20-200-480020 kW200 Vdc4800 AdcFloor-standing2.5 Vdc
ALx20-500-200020 kW500 Vdc2000 AdcFloor-standing6.0 Vdc
ALx20-1000-60020 kW1000 Vdc600 AdcFloor-standing7.5 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.

200 Vdc ALx Series Models

200 Vdc ALx Series MagnaLOAD Operating Profile

500 Vdc ALx Series Models

500 Vdc ALx Series MagnaLOAD Operating Profile

1000 Vdc ALx Series Models

1000 Vdc ALx Series MagnaLOAD Operating Profile
AC Input Specifications
AC Input Voltage
1.25 kW to 2.5 kW Models
85 to 265 Vac (UI: Universal Input)
1F, 2-wire + ground
AC Input Voltage
5 kW to 20 kW Models
120 Vac (120SP: operating range 108 to 132 Vac)
240 Vac (240SP: operating range 216 to 264 Vac)
1F, 2-wire + ground
AC Input Frequency
45-66 Hz
AC Input Isolation
±1500 Vac, maximum input voltage to ground
DC Input Isolation
±1500 Vdc, maximum DC input voltage to ground
Programming Specifications
Resolution
All Modes
16-bit, 0.0015%
Accuracy
Voltage: ±0.1% of full scale voltage rating
Current: ±0.2% of full scale current rating
Power: ±0.3% of full scale power rating
Resistance: ±0.3% of full scale resistance rating
Rise/Fall Time
Maximum
Voltage Mode: 100 ms, 10% to 90% max voltage
Current Mode: 560 µs, 10% to 90% max current
Power Mode: 35 ms, 10% to 90% max power
Resistance Mode: 40 ms, 10% to 90% max resistance rating
Trip Settings Range 
Over Voltage: 10% to 110% of full scale voltage rating
Under Voltage: 0% to 110% of full scale voltage rating
Over Current: 10% to 110% of full scale current rating
Over Power: 10% to 110% of full scale power rating
Connectivity Specifications
Communication Interfaces
Standard
USB Host (Front): Type B
USB Host (Rear): Type B
RS485 (Rear): RJ-45
MagnaLINK™: RJ-25 x 2
External User I/O: Standard, 25-pin D-sub Female
Communication Interfaces
Optional
LXI TCP/IP Ethernet (Rear): RJ-45
GPIB (Rear): IEEE-488
External User I/O Specifications
Digital Input Voltage
5 V
Digital Input Impedance
10 kO
Digital Monitoring Voltage
5 V, 32 mA capacity
Digital Reference Voltage
5V, 20 mA capacity
Analog Sampling Rate
2 kHz
Analog Programming Voltage
0-10 V
Analog Programming Resolution
12-bit, 0.025%
Analog Monitoring Voltage
0-10 V, 3 mA capacity
Analog Monitoring Impedance
0.005 O
Analog Monitoring Accuracy
0.05% of full scale
Analog Reference Voltage
10 V, 20 mA capacity
Physical Specifications
Size and Weight
1.25 kW Models
3U
5.25” H x 19” W x 24” D (13.34 x 48.26 x 60.96 cm)
40 lbs (18.1 kg)
Size and Weight
2.5 kW Models
3U
5.25” H x 19” W x 24” D (13.34 x 48.26 x 60.96 cm)
65 lbs (29.5 kg)
Size and Weight
5 kW Models
12U Cabinet
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
255 lbs (115.7 kg)
Size and Weight
7.5 kW Models
12U Cabinet
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
320 lbs (145.2 kg)
Size and Weight
10 kW Models
385 lbs (174.6 kg)
12U Cabinet
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
Size and Weight
12.5 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
500 lbs (226.8 kg)
Size and Weight
15 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
565 lbs (256.3 kg)
Size and Weight
17.5 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
630 lbs (285.8 kg)
Size and Weight
20 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
695 lbs (315.3 kg)
Environmental Specifications
Ambient Operating Temperature
0°C to 50°C
Storage Temperature
-25°C to +85°C
Humidity
Relative humidity up to 95% non-condensing
Air Flow
Front air inlet, rear exhaust
Regulatory Compliance
EMC
Complies with European EMC Directive for test and measurement products
Safety
Complies with EN61010-1
CE Mark
Yes
RoHS Compliant
Yes
Front Panel
1.25 kW and 2.5 kW Models
ALx Series Front Panel Diagram
Rear Panel
1.25 kW and 2.5 kW Models
ALx Series Rear Panel Diagram
Side Panel
1.25 kW and 2.5 kW Models
ALx Series Side Panel Diagram
Front Panel
5 kW to 20 kW Models
ALx Series Front Panel Diagram
Rear Panel
5 kW to 20 kW Models
ALx Series Rear Panel Diagram

IEEE-488 GPIB

 
+GPIB
This option provides an integrated IEEE-488 GPIB communications port, allowing the product to be fully controlled and monitored using supported commands, as well as adding some additional interface specific commands.

LXI TCP/IP Ethernet

 
+LXI
This option provides an integrated TCP/IP Ethernet communications port, allowing the product to be fully controlled and monitored using supported commands, as well as adding some additional interface specific commands.

Accessories Available

NameItemDescriptionDocs
MagnaLINK-6178886-ft MagnaLINK CableN/A
MagnaLINK-121788812-ft MagnaLINK CableN/A
MID-M17888MagnaLINK Interface Device - MasterN/A
MID-S17888MagnaLINK Interface Device - SlaveN/A
CAB1: Cabinet and Integration 11788312U Cabinet (32” H x 24” W x 31.5” D) with casters, fans, and product integrationN/A
CAB2: Cabinet and Integration 21788324U Cabinet (51.5” H x 24” W x 31.5” D) with casters, fans, and product integrationN/A
CAB3: Cabinet and Integration 31788330U Cabinet (67” H x 24” W x 31.5” D) with casters, fans, and product integrationN/A
CAB4: Cabinet and Integration 41788336U Cabinet (75” H x 24” W x 31.5” D) with casters, fans, and product integrationN/A
CAB3x2: Cabinet and Integration 3x21788360U Double Cabinet (67” H x 48” W x 31.5” D) with casters, fans, and product integrationN/A
CAB4x2: Cabinet and Integration 4x21788372U Double Cabinet (75” H x 48” W x 31.5” D) with casters, fans, and product integrationN/A

White Papers

Electronic Loads — A New Generation

A technical paper on the various electronic load technologies and a technical overview of Magna-Power Electronics patented (US Patent 9,429,629) Active Resistance Technology.

Application Notes

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