2. Product Introduction

2.1. Features at a Glance

The SL Series builds on nearly 40 years of power supply innovation at Magna-Power, designed from the ground up to meet the highly reliable power dense demands of ATE system integrators through Magna-Power’s signature current-fed power processing topology. Utilizing state-of-the-art semiconductors and innovative internally designed and manufactured heat sinks, the SL Series offers industry-leading 1U (1.75” height) programmable power levels with models at 1.5 kW, 2.6 kW, 4 kW, 6 kW, and 8 kW, while still maintaining an ambient operating temperature rating up to 50°C.

A quick summary of the SL Series key features:

  • SCPI Remote Programming API
  • High Accuracy Measurements
  • Master-Slave Functionality
  • Remote Sensing
  • 37-Pin External User I/O
  • RS232 Interface
  • Ethernet and GPIB Available
  • 0-10V External Analog Inputs
  • Programmable Protection Limits
  • Fast Transient Response
  • Remote Interface Software
  • NI LabVIEW™ and IVI Driver
  • Interlock Shutdown Input
  • Designed and manufactured in the USA

2.1.1. Output Features

  • Robust Power Conversion Topology - All MagnaDC programmable DC power supplies utilize high-frequency IGBT-based power processing in current-fed topology. This topology adds an additional stage over the conventional voltage-fed topology for enhanced control and system protection, ensuring that even under a fault condition, the power supply will self-protect. Due to the self-protecting characteristics of this topology, the possibility of fast rising current spikes and magnetic core saturation is elimated. Every power supply is tested at 90% to 125% nominal line to ensure satisfactory operation even under the worst line voltage conditions.
  • Fast Transient Response - Quick response to load changes, with 2 ms to recover within ±1% of regulated output with a 50% to 100% or 100% to 50% step load change.
  • Programmable Output Protection - Programmable over voltage trip (OVT) and over current trip (OCT) allow the user to program in soft latching fault trips when the threshold is exceeded. OVT and OCT settings can be programmed from 10% to 110% of the unit’s max ratings.
  • Wired Remote Sensing with Smart Detection - A set of remote sensing terminals are provided to sense voltage at the load and compensate for voltage drop in the load cables. Compensation is provided up to 3% above the unit’s max rated voltage.
  • Leadless Remote Sensing - Using the product’s integrated modulation functionality, automatically compensate for voltage as a function of current. When the impedance between the power supply and load is known, this feature allows for remote sensing without leads, up to the max ratings of the product.

2.1.2. Programming Features

  • High Accuracy Programming and Measurment - ± 0.075% of max rated voltage or current programming accuracy to ensures the output is following the desired programmed set point. ± 0.2% of max rated voltage or current readback accuracy ensures high accuracy measurements. A NIST traceable calibration certificate is provided at no charge with all new units.
  • Simultaneous Measurement Interfaces - Voltage and current measurements are available simultaneously from the front panel meters, dedicated 0-10V analog output, and by computer command.
  • SCPI Remote Programming API - Compatible with the Standard Commands for Programmable Instruments (SCPI), allowing raw ASCII text commands to control all features, functions, and configurations of the product. Commands are consistent across all available interfaces.
  • 37-pin External User I/O Port - An isolated 37-pin external user I/O port is provided, which includes a variety of analog and digital inputs and outputs. Voltage, current, over voltage and over current set points can be set by applying a 0-10V analog signal. Each diagnostic condition is given a designated pin, which reads +5V when active. Reference +5V and +10V signals are provided, eliminating the need for external voltage signals and allowing the use of dry contacts. All these pins are isolated from the output terminals and referenced to earth-ground as standard—no additional isolation equipment or options necessary.

2.1.3. System Features

  • AC Mechanical Contactor with In-rush Limiter - An integrated mechanical contactor on the AC input circuit ensures the product is not processing power when in standby or fault. This contactor, coupled with step-start in-rush limiter circuitry, ensures no in-rush current will exceed peak input current rating of the product.
  • Designed for Safety - Extensive diagnostic functions are provided, including: AC phase loss (not on SL/XR Series), excessive thermal conditions, over voltage trip (programmable), over current trip (programmable), cleared fuse (not on SL/XR Series), excessive program line voltage, and interlock fault. 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.
  • High-Performance Plug and Play Master-Slaving - Power capability can easily expanded with additional units by using the plug and play UID47 master-slaving device. In the MagnaDC master-slave scheme, the master sends gate drive signals directly to the slave units. This strategy eliminates the noise suceptibility commonly found when sending analog control references over long distances, in addition to enabling consistent performance by maintaining a single control loop.
  • Tailor Performance with Integrated Options - A variety of configured-to-order options are available for MagnaDC programmable power supplies are designed to be flexible, depending on the application’s requirements.
  • Designed and Manufactured in the USA - 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 NIST-traceable calibration, followed by an extended burn-in period.

2.2. Models

The following tables list the available models in the SL Series MagnaDC power supply. Ripple is specified for standard models. Ripple will be higher for models with the High Slew Rate Output (+HS). Efficiency is measured at the model’s maximum ratings.

2.2.1. Model Ordering Guide

The following ordering guide defines how an SL Series MagnaDC power supply is defined:


Fig. 2.1 SL Series MagnaDC power supply Model Ordering Guide

2.2.2. 1.5 kW SL Series Models

Model Maximum Voltage Maximum Current Ripple Efficiency
SL5-250 5 Vdc 250 Adc 50 mVrms 84%
SL10-150 10 Vdc 150 Adc 40 mVrms 89%
SL16-93 16 Vdc 93 Adc 35 mVrms 89%
SL20-75 20 Vdc 75 Adc 40 mVrms 90%
SL25-60 25 Vdc 60 Adc 40 mVrms 91%
SL32-46 32 Vdc 46 Adc 40 mVrms 91%
SL40-37 40 Vdc 37 Adc 40 mVrms 91%
SL50-30 50 Vdc 30 Adc 50 mVrms 92%
SL60-25 60 Vdc 25 Adc 60 mVrms 93%
SL80-18 80 Vdc 18 Adc 60 mVrms 93%
SL100-15 100 Vdc 15 Adc 60 mVrms 93%
SL125-12 125 Vdc 12 Adc 100 mVrms 93%
SL160-9 160 Vdc 9 Adc 120 mVrms 93%
SL200-7.5 200 Vdc 7.5 Adc 125 mVrms 94%
SL250-6 250 Vdc 6 Adc 130 mVrms 94%
SL300-5 300 Vdc 5 Adc 160 mVrms 94%
SL375-4 375 Vdc 4 Adc 170 mVrms 94%
SL400-3.7 400 Vdc 3.7 Adc 180 mVrms 95%
SL500-3 500 Vdc 3 Adc 220 mVrms 95%
SL600-2.5 600 Vdc 2.5 Adc 250 mVrms 95%
SL800-1.8 800 Vdc 1.8 Adc 300 mVrms 95%
SL1000-1.5 1000 Vdc 1.5 Adc 350 mVrms 95%
SL1250-1.2 1250 Vdc 1.2 Adc 375 mVrms 95%
SL1500-1 1500 Vdc 1 Adc 400 mVrms 95%

2.2.3. 2.6 kW SL Series Models

Model Maximum Voltage Maximum Current Ripple Efficiency
SL10-250 10 Vdc 250 Adc 40 mVrms 89%
SL16-162 16 Vdc 162 Adc 35 mVrms 89%
SL20-130 20 Vdc 130 Adc 40 mVrms 90%
SL25-104 25 Vdc 104 Adc 40 mVrms 91%
SL32-81 32 Vdc 81 Adc 40 mVrms 91%
SL40-65 40 Vdc 65 Adc 40 mVrms 91%
SL50-52 50 Vdc 52 Adc 50 mVrms 92%
SL60-43 60 Vdc 43 Adc 60 mVrms 93%
SL80-32 80 Vdc 32 Adc 60 mVrms 93%
SL100-26 100 Vdc 26 Adc 60 mVrms 93%
SL125-20 125 Vdc 20 Adc 100 mVrms 93%
SL160-16 160 Vdc 16 Adc 120 mVrms 93%
SL200-13 200 Vdc 13 Adc 125 mVrms 94%
SL250-10.4 250 Vdc 10.4 Adc 130 mVrms 94%
SL300-8.6 300 Vdc 8.6 Adc 160 mVrms 94%
SL375-6.9 375 Vdc 6.9 Adc 170 mVrms 94%
SL400-6.5 400 Vdc 6.5 Adc 180 mVrms 95%
SL500-5.2 500 Vdc 5.2 Adc 220 mVrms 95%
SL600-4.3 600 Vdc 4.3 Adc 250 mVrms 95%
SL800-3.2 800 Vdc 3.2 Adc 300 mVrms 95%
SL1000-2.6 1000 Vdc 2.6 Adc 350 mVrms 95%
SL1250-2 1250 Vdc 2 Adc 375 mVrms 95%
SL1500-1.7 1500 Vdc 1.7 Adc 400 mVrms 95%

2.2.4. 4 kW SL Series Models

Model Maximum Voltage Maximum Current Ripple Efficiency
SL16-250 16 Vdc 250 Adc 35 mVrms 89%
SL20-200 20 Vdc 200 Adc 40 mVrms 90%
SL25-160 25 Vdc 160 Adc 40 mVrms 91%
SL32-125 32 Vdc 125 Adc 40 mVrms 91%
SL40-100 40 Vdc 100 Adc 40 mVrms 91%
SL50-80 50 Vdc 80 Adc 50 mVrms 92%
SL60-66 60 Vdc 66 Adc 60 mVrms 93%
SL80-50 80 Vdc 50 Adc 60 mVrms 93%
SL100-40 100 Vdc 40 Adc 60 mVrms 93%
SL125-32 125 Vdc 32 Adc 100 mVrms 93%
SL160-25 160 Vdc 25 Adc 120 mVrms 93%
SL200-20 200 Vdc 20 Adc 125 mVrms 94%
SL250-16 250 Vdc 16 Adc 130 mVrms 94%
SL300-13.2 300 Vdc 13.2 Adc 160 mVrms 94%
SL375-10.4 375 Vdc 10.4 Adc 170 mVrms 94%
SL400-10 400 Vdc 10 Adc 180 mVrms 95%
SL500-8 500 Vdc 8 Adc 220 mVrms 95%
SL600-6.4 600 Vdc 6.4 Adc 250 mVrms 95%
SL800-5 800 Vdc 5 Adc 300 mVrms 95%
SL1000-4 1000 Vdc 4 Adc 350 mVrms 95%
SL1250-3.2 1250 Vdc 3.2 Adc 375 mVrms 95%
SL1500-2.6 1500 Vdc 2.6 Adc 400 mVrms 95%

2.2.5. 6 kW SL Series Models

Model Maximum Voltage Maximum Current Ripple Efficiency
SL20-250 20 Vdc 250 Adc 40 mVrms 90%
SL25-240 25 Vdc 240 Adc 40 mVrms 91%
SL32-186 32 Vdc 186 Adc 40 mVrms 91%
SL40-150 40 Vdc 150 Adc 40 mVrms 91%
SL50-120 50 Vdc 120 Adc 50 mVrms 92%
SL60-100 60 Vdc 100 Adc 60 mVrms 93%
SL80-75 80 Vdc 75 Adc 60 mVrms 93%
SL100-60 100 Vdc 60 Adc 60 mVrms 93%
SL125-48 125 Vdc 48 Adc 100 mVrms 93%
SL160-36 160 Vdc 36 Adc 120 mVrms 93%
SL200-30 200 Vdc 30 Adc 125 mVrms 94%
SL250-24 250 Vdc 24 Adc 130 mVrms 94%
SL300-20 300 Vdc 20 Adc 160 mVrms 94%
SL375-16 375 Vdc 16 Adc 170 mVrms 94%
SL400-15 400 Vdc 15 Adc 180 mVrms 95%
SL500-12 500 Vdc 12 Adc 220 mVrms 95%
SL600-10 600 Vdc 10 Adc 250 mVrms 95%
SL800-7.5 800 Vdc 7.5 Adc 300 mVrms 95%
SL1000-6 1000 Vdc 6 Adc 350 mVrms 95%
SL1250-4.8 1250 Vdc 4.8 Adc 375 mVrms 95%
SL1500-4 1500 Vdc 4 Adc 400 mVrms 95%

2.2.6. 8 kW SL Series Models

Model Maximum Voltage Maximum Current Ripple Efficiency
SL32-250 32 Vdc 250 Adc 40 mVrms 91%
SL40-200 40 Vdc 200 Adc 40 mVrms 91%
SL50-160 50 Vdc 160 Adc 50 mVrms 92%
SL60-133 60 Vdc 133 Adc 60 mVrms 93%
SL80-100 80 Vdc 100 Adc 60 mVrms 93%
SL100-80 100 Vdc 80 Adc 60 mVrms 93%
SL125-64 125 Vdc 64 Adc 100 mVrms 93%
SL160-50 160 Vdc 50 Adc 120 mVrms 93%
SL200-40 200 Vdc 40 Adc 125 mVrms 94%
SL250-32 250 Vdc 32 Adc 130 mVrms 94%
SL300-26.4 300 Vdc 26.4 Adc 160 mVrms 94%
SL375-21.3 375 Vdc 21.3 Adc 170 mVrms 94%
SL400-20 400 Vdc 20 Adc 180 mVrms 95%
SL500-16 500 Vdc 16 Adc 220 mVrms 95%
SL600-13.3 600 Vdc 13.3 Adc 250 mVrms 95%
SL800-10 800 Vdc 10 Adc 300 mVrms 95%
SL1000-8 1000 Vdc 8 Adc 350 mVrms 95%
SL1250-6.4 1250 Vdc 6.4 Adc 375 mVrms 95%
SL1500-5.3 1500 Vdc 5.3 Adc 400 mVrms 95%

2.3. Specifications

2.3.1. AC Input Specifications

1Φ AC Input Voltage
1Φ, 2-wire + ground
85 to 265 Vac (UI: Universal input; 1.5 kW Models)
187 to 265 Vac (UI2: Universal input; 2.6 kW Models)
3Φ AC Input Voltage
3Φ, 3-wire + ground
Available on all models
208 Vac (operating range 187 to 229 Vac)
240 Vac (operating range 216 to 264 Vac)
380/400 Vac (operating range 342 to 440 Vac)
415 Vac (operating range 373 to 456 Vac)
440 Vac (operating range 396 to 484 Vac)
480 Vac (operating range 432 to 528 Vac)
AC Input Current Refer to chart of available models
AC Input Frequency 50-400 Hz
Power Factor
0.99 at max power; models with 1Φ AC input
>0.82 at max power; models with 3Φ AC input
AC Input Isolation ±2500 Vac, maximum input voltage to ground

2.3.2. Output Specifications

Voltage Ripple Refer to chart of available models.
Line Regulation
Voltage mode: ± 0.004% of full scale
Current mode: ± 0.02% of full scale
Load Regulation
Voltage mode: ± 0.01% of full scale
Current mode: ± 0.04% of full scale
Load Transient Response 2 ms to recover within ±1% of regulated output with a 50% to 100% or 100% to 50% step load change
Stability ± 0.10% for 8 hrs. after 30 min. warm-up
Efficiency 86% to 88%; refer to chart of available models
DC Output Isolation ±1000 Vdc max output voltage to ground

2.3.3. Programming Specifications

Programming Accuracy
Voltage: ±0.075% of max voltage rating
Current: ±0.075% of max current rating
Measurement Accuracy
Voltage: ±0.2% of max voltage rating
Current: ±0.2% of max current rating
Maximum Slew Rate
Standard Models
100 ms, output voltage change from 0 to 63%
100 ms, output current change from 0 to 63%
Maximum Slew Rate
Models with High Slew Rate Option (+HS)
4 ms, output voltage change from 0 to 63%
8 ms, output current change from 0 to 63%
Trip Settings Range
Over Voltage: 10% to 110% max voltage rating
Over Current: 10% to 110% max current rating
Computer Command Protocol Standard Commands for Programmable Instruments (SCPI)
Remote Sense Limits
3% maximum voltage drop from output to load

2.3.4. Connectivity Specifications

Communication Interfaces (Standard)
RS232: DB-9, Female
External User I/O: DB-37, Female
Communication Interfaces (Optional)
LXI TCP/IP Ethernet: RJ-45

2.3.5. External User I/O Specifications

For more details about the External User I/O, see: Operation: External User I/O.

2.3.6. Physical Specifications

Power Level Rack Units Size Weight
1.5 kW 1U
1.75” H x 19” W x 24” D
(4.4 x 48.3 x 61.0 cm)
32 lbs (14.52 kg)
2.6 kW 1U
1.75” H x 19” W x 24” D
(4.4 x 48.3 x 61.0 cm)
34 lbs (15.42 kg)
4 kW 1U
1.75” H x 19” W x 24” D
(4.4 x 48.3 x 61.0 cm)
35 lbs (15.88 kg)
6 kW 1U
1.75” H x 19” W x 24” D
(4.4 x 48.3 x 61.0 cm)
35 lbs (15.88 kg)
8 kW 1U
1.75” H x 19” W x 24” D
(4.4 x 48.3 x 61.0 cm)
36 lbs (16.33 kg)

2.3.7. 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 Side air inlet, rear exhaust
Temperature Coefficient
0.04%/°C of maximum output voltage
0.06%/°C of maximum output current

2.3.8. Regulatory Compliance

Complies with 2014/30/EU (EMC Directive)
CISPR 22 / EN 55022 Class A
NRTL Listed, Intertek Control Number 5014353
Conforms to UL61010-1:2012 Ed.3+R:29Apr2016
Certified to CSA C22.2#61010-1-12:2012 Ed.3
Complies with EN61010-1 and 2014/35/EU (Low Voltage Directive)
CE Mark Yes
RoHS Compliant Yes

2.4. Dimensional Diagrams


2.5. Principle of Operation

This section provides a general overview of the technology and power processing stages in a Magna-Power Electronics SL Series. fig-block-diagram provides an visual overview of the power supply’s main power and control stages.


Fig. 2.3 SL Series MagnaDC power supply functional block diagram

Power is fed through AC fuses and is distributed to the auxiliary power supply, inrush limiter, and main 3Φ contactor. The auxiliary power supply operates off the AC mains, supplying power to the other printed circuit boards in the system. The inrush limiter is a step start device which is used to initially charge capacitors on the input DC bus and limit the inrush of current. The inrush limiter is initiated when the power supply is switched from a standby to a power state. After the charge cycle, the main 3Φ contactor is energized and power is allowed to flow to the load. The EMI filter reduces common mode and differential mode noise emanating from the supply.

Output power is controlled through a polyphase chopper. For the 4 kW SL Series power supplies, three choppers, phased 120° apart, provide a current source to a current fed inverter. The 2.6 kW SL Series power supplies uses two choppers, phased 180° apart, and the 1.5 kW supplies uses only one chopper. The choppers are controlled with current mode, pulse width modulation (PWM).

This modulation scheme provides a quick response for transients and filtering harmonics on the DC bus. As illustrated, chopper output current is monitored for balancing and for sensing overload current conditions. The polyphase chopper has been engineered to eliminate harmonic components minimizing currents circulating in the power supply.

The polyphase chopper produces a controlled DC bus which is connected to DC link inductors and current fed, IGBT inverter. The inverter, which operates above 20 kHz, excites the main transformer at higher than normal line frequencies. This operation produces ohmic isolation between the input and output of the power supply using a transformer of dramatically reduced size.

The inverter operates with a 50% duty cycle and its frequency operation is transparent to the performance of the power supply.

The output of the main power transformer is converted to DC via rectifiers. Low voltage versions of the SL Series power supply use midpoint diode configurations and higher voltage versions use bridge configurations.

The DC output voltage is filtered with a pi section filter. This, in combination with the DC link inductors, form a double stage inductive capacitive (LC) filter.

The gate driver board supports a synchronized modulation scheme which integrates power semiconductor switching of the switching power supply, polyphase chopper, and IGBT inverter.

The phase detector senses input line voltage on each phase. Upon detection of a problem, the control board is signaled to shutdown the system. The control board, which is referenced to earth ground, contains optically isolated amplifiers to sense output voltage and current. This circuitry allows the output to be referenced ±1000 Vdc above earth ground.

The display board contains light-emitting diodes for displaying diagnostic conditions and provides an interface for meters and switches.

2.6. Options

2.6.1. Blocking Diode (+BD)

The integrated Blocking Diode (+BD) option provides an internally heat-sunk protection diode on the positive output terminal of a MagnaDC programmable DC power supply. This diode protects the product’s output from reverse voltage up to 1200 Vdc. All voltage sensing is performed after the protection diode—at the product’s output terminals—making the diode’s operation completely transparent to the performance of the power supply.

The +BD option is recommended for applications where there is significant back-emf or the possibility of a DC output voltage that could exceed the power supply’s output voltage rating, such as:

  • DC motor drives
  • Battery and capacitor charging
  • Large electromagnets

In these applications, the integrated blocking diode can be used to prevent back-emf from the energy stored in the load into the power supply’s output. Furthermore, the integrated blocking diode will prevent the power supply’s internal bleed resistance from discharging the energy storaged in the load when the power supply is off or in standby.


The +BD option is available for models with maximum output voltage rating as specified for the following product series:

  • TS Series, models rated from 100 Vdc to 1000 Vdc
  • MS Series, models rated from 100 Vdc to 1000 Vdc
  • MT Series, models rated from 125 Vdc to 1000 Vdc


The +BD option cannot be combined with the +ISO option.

Table 2.1 Additional specifications for Blocking Diode (+BD) option
Reverse Voltage Rating 1200 Vdc
Additional Losses Up to 1.4%

2.6.2. High Isolation Output (+ISO)

Certain applications require floating the output voltage to values beyond the power supply isolation rating. Magna-Power’s High Isolation Output Option (+ISO) enables a TS Series, MS Series or MT Series model with a peak output voltage rating of 250 Vdc through 1000 Vdc to be rated for a higher voltage output isolation. Improved isolation is achieved by a novel output stage with improved controller isolation. In addition to being able to float the power supply to a higher output voltage, this option also enables lower voltage units to be tied together in series up to its new higher isolation rating, in accordance with the table in the Specifications section below.


The +ISO option is available for models with maximum output voltage rating as specified for the following product series:

  • TS Series, models rated from 250 Vdc to 1000 Vdc
  • MS Series, models rated from 250 Vdc to 1000 Vdc
  • MT Series, models rated from 250 Vdc to 1000 Vdc


The +ISO option cannot be combined with the +BD or +WC options.


Addition of the +ISO option will cause the product’s wired remote sense feature to be removed.

Table 2.2 Option isolation rating for various configurations
Product Series
Output Isolation Standard,
No Option
Output Isolation for
Models Rated 250-1000 Vdc
With +ISO Option
Output Isolation for
Models Rated Above 1000 Vdc;
Standard, No Option Necessary
SL Series ±1000 Vdc N/A N/A
XR Series ±1000 Vdc N/A ±(2000 Vdc + Vo/2)
TS Series ±1000 Vdc ±(2000 Vdc + Vo/2) ±(2000 Vdc + Vo/2)
MS Series ±1000 Vdc ±(2000 Vdc + Vo/2) ±(2000 Vdc + Vo/2)
MT Series ±1000 Vdc ±4000 Vdc ±4000 Vdc

2.6.3. High Slew Rate Output (+HS)

The High Slew Rate Output (+HS) solves several limitations inherent in switching power supply design. Rapid voltage transitions require internal electronics to supply the energy to charge and discharge output capacitors. Peak currents internal to the power supply define slew rate; utilizing less capacitance enables voltage transitions in shorter time periods. Additionally, less capacitance reduces requirements for discharge demands during open circuit conditions.

The standard output stage Magna-Power Electronics power supplies has been designed to provide the lowest possible output ripple voltage within the constraints of available components, size, and cost. Part of the output stage consists of a bank of aluminum electrolytic capacitors which has the desired electrical properties to provide this function. These components require bleed resistors to discharge any voltage when the power supply has no load and is disabled. While the presence of these components and the resulting performance are normally industry accepted, there are applications where lower output capacitance and lower loss bleed resistors are extremely desirable and higher ripple voltage is acceptable. To meet this need, a high-slew rate option is available which has an output stage consisting of low capacitance film and aluminum electrolytic capacitors and lower loss bleed resistors. Applications for the high-slew rate option include battery charging, photovoltaic emulation, power waveform generation, and medium speed power pulsing. These applications all benefit from higher bandwidth and in many cases, can tolerate increased ripple voltage.

Key Applications

For battery charger applications, output capacitance and internal bleed resistors present themselves as a load to the connecting batteries. One common practice is to use a series diode to block reverse current flow with the sacrifice of increased cost and lower efficiency. The high slew rate option, with its lower output capacitance and lower loss bleed resistors, enables direct connection to batteries without series blocking diodes.

For photovoltaic emulation applications, higher bandwidth and lower output capacitance enable improved performance with higher speed, maximum power tracker algorithms. Maximum power tracker circuitry deviates the operating point of photovoltaic arrays to determine maximum power output. Slow responding emulation sources can present a problem when the speed of the algorithm exceeds that of the source. Furthermore, with lower output capacitance, changes in the operating point and transients, caused by shorting the solar inverter input, produce lower unwanted input currents.

The high-slew rate option enables the power supply to operate as a low frequency, power pulse generator. With the special capacitors selected for this option, it is possible to superimpose waveforms or produce a medium speed pulse on top of the dc output and expect normal capacitor life. It is important to note that the power supply output is single quadrant; that is, the output voltage or current cannot reverse.


The +HS option is available for the following product series: * SL Series * XR Series * TS Series * MS Series * MT Series


XR Series models greater than 2000 Vdc already include a high slew rate output stage and no additional +HS option is available for these models.

Table 2.3 Additional specifications for High Slew Rate Output (+HS) option
Max Voltage Rating
Output Capacitance
SL Series (µF)
Output Capacitance
XR Series (µF)
Output Capacitance
TS Series and MS Series (µF) [1]
Ripple (Vrms)
5 4235 13200 13200 0.5
8 N/A N/A 9000 0.5
10 1740 4080 9000 0.5
16 1740 4080 4080 0.5
20 775 2340 2340 0.7
25 775 1170 2340 0.7
32 775 1170 1170 1.4
40 760 240 1170 1.5
50 760 240 1170 1.5
60 760 240 300 1.5
80 110 240 300 1.5
100 110 160 200 1.6
125 70 160 200 1.6
160 70 160 200 1.6
200 70 160 200 1.6
250 70 160 200 1.6
300 70 160 200 1.8
375 70 160 200 1.8
400 70 160 200 1.8
500 40 56 200 2.1
600 40 56 120 2.3
800 30 52 70 2.5
1000 30 52 60 3.0
1250 N/A 18 18 3.5
1500 N/A 18 18 3.5
2000 N/A 18 18 3.5
3000 N/A N/A 9 4.0
4000 N/A N/A 9 4.0
6000-10000 N/A N/A N/A N/A
[1]For 20 to 30 kW models, multiply capacitance by 2; 45 kW models, multiply capacitance by 3; 60 kW models, multiply capacitance by 4; 75 kW models, multiply capacitance by 5; TS Series 4U/8U models and MT Series models, please contact Magna-Power support.

2.6.4. IEEE-488 GPIB (+GPIB)

The IEEE-488 GPIB (+GPIB) option, sometimes called the General Purpose Interface Bus (GPIB), is a general purpose digital interface system that can be used to transfer data between two or more devices. It is particularly well-suited for interconnecting computers and instruments. Some of its key features are:

  • Up to 15 devices may be connected to one bus
  • Total bus length may be up to 20 m and the distance between devices may be up to 2 m
  • Communication is digital and messages are sent one byte (8 bits) at a time
  • Message transactions are hardware handshaked
  • Data rates may be up to 1 Mbyte/sec

The IEEE-488 GPIB interface in integrated with the power supply’s rear communication ports. The IEEE 488 interface offers full compatibility with Magna-Power provided drivers, software and SCPI command set.


The +GPIB option is available for the following product series:

  • SL Series
  • XR Series
  • TS Series
  • MS Series
  • MT Series

2.6.5. LXI TCP/IP Ethernet (+LXI)

Certified to the LXI Standard (Class C), version 1.4, the LXI TCP/IP Etherent (+LXI) allows the product to be fully controlled over an integrated TCP/IP Ethernet interface. LXI is an instrumentation platform based on industry standard Ethernet technology designed to provide modularity, flexibility, and performance to small- and medium-sized systems. All of the product’s standard SCPI commands are supported over the +LXI option, along with all provided software and drivers.

LXI’s advantages are exemplified in its compact, flexible package providing high-speed I/O and reliable measurements. The Magna-Power Electronics LXI TCP/IP Ethernet option includes an embedded web-server, allowing web browser power supply control and monitoring from virtually anywhere.


The +LXI option is available for the following product series:

  • SL Series
  • XR Series
  • TS Series
  • MS Series
  • MT Series

2.6.6. Ruggedized (+RUG)

The Ruggedized Option (+RUG) provides additional mechanical security for large power components and sub-assemblies within SL Series and XR Series products.

SL Series and XR Series units with the Ruggedized Option have been independently tested to comply with the following MIL-STD-810G shock and vibration specifications:

  • MIL-STD-810G CHG1 Method 516.7 Functional Shock, Procedure I; which subjects the product to 40G, 11 ms terminal saw tooth pulse; three shocks in each direction along three mutually perpendicular axes
  • MIL-STD-810G CHG1 Method 514.7 Vibration; which subjects the product to two hours of vibration per axis along three mutually perpendicular axes

All products with the Ruggedized Option maintain ambient operating temperatures from 0°C to 50°C and ambient storage temperatures from -25°C to +85°C.


The +RUG option is available for the following product series:

  • SL Series
  • XR Series

2.6.7. Water Cooling (+WC)

The Water Cooling (+WC) option is available for Magna-Power power supplies for use in densely packaged system cabinets, where heat removal by the product’s standard air cooling presents a challenge. Water cooling is accomplished with chill plates and an integrated central heat exchanger. The chill plates provides a thermal conduction path for heat sensitive components and the central heat exchanger removes heat from air internal to the enclosure. An internal solenoid valve enables water flow when the chill plate reaches 60°C. Operation of the solenoid prevents internal condensation.

Each 5 kW to 15 kW module has a 1/4” NPT female inlet and outlet for water flow. For models greater than 15 kW, external plumbing interconnects power supply modules. A minimum of 2.50” is recommended behind the enclosure for this hardware and user connections. For systems requiring more than one power supply, plumbing connections must be paralleled; that is, water should not flow from one power supply into another.

When water cooled power supplies are ordered in combination with the Cabinet and Integration accessory, Magna-Power will parallel the water inlet connections and parallel the water outlet connections, providing a single inlet and outlet for the rack.


The +WC option is available for models with maximum output voltage rating as specified for the following product series:

  • TS Series, models rated from 1000 Vdc and below
  • MS Series, models rated from 1000 Vdc and below


The +WC option cannot be combined with the +ISO option.

For detailed specifications on the +WC, including flow rate and pressure, please refer to the individual product specifications.

2.7. Accessories

2.7.1. Cabinet and Integration

Cabinet and integration services are offered for the rack-mount programmable DC power supply products. Cabinets are supplied with fans rated to installed products. Key features of the cabinet and integration option are as follows:

  • Internally fabricated, heavy duty welded cabinet frames
  • Casters installed, including (2) locking casters
  • Special circuitry for product integration with cabinet fans
  • Installation and testing as a complete system
Table 2.4 Specifications for Cabinet and Integration
Cabinet Item Name Dimensions Internal Rack Space
31.5” H x 24” W x 31.5” D
(80.0 x 55.6 x 80.0 cm)
51” H x 24” W x 31.5” D
(129.5 x 61.0 x 80.0 cm)
67” H x 24” W x 31.5” D
(170.2 x 61.0 x 80.0 cm)
74” H x 24” W x 31.5” D
(188.0 x 61.0 x 80.0 cm)
67” H x 48” W x 31.5” D
(170.2 x 122.0 x 80.0 cm)
74” H x 48” W x 31.5” D
(188.0 x 122.0 x 80.0 cm)

2.7.2. DC Power Cables

Utilizing Magna-Power’s internal cable manufacturing operations, custom-made DC power cables are offered as an accessory. The following table identifies the various cables and voltage ratings that are offered:

Table 2.5 Specifications for Magna-Power DC power cables
Cable Gauge (AWG) Voltage Rating (Vdc) Per Cable Ampacity Rating (90°C)
10 15000 55
4 600 100
4 4000 100
1 600 160
1 4000 160
2/0 600 223
2/0 4000 223
4/0 600 310
4/0 4000 310

Use the following cable configuration guide and the table above to define the appropriate cable for your application and product:

CBL-[Feet]-[Cable Gauge]-[Voltage Rating]-[Termination 1]-[Termination 2]

For example: CBL-10-4/0-600-3/8-3/8; 10-feet, 4/0 cable rated for 600 Vdc terminated with 3/8” lugs on both ends.

Refer to the product diagrams for the respective product series for the DC output bus thread size and number of connection points.

2.7.3. Universal Interface Device (UID47)

Magna-Power Electronics UID47 is a general purpose device for connection to Magna-Power Electronics’ power supplies. The device contains the necessary circuitry for configuring power supplies for master/slave parallel or series operation.

Master/slave parallel operation allows two or more power supplies to equally share output current when connected together. Master/slave series operation allows two or more power supplies to equally share output voltage when connected together. In either operation mode, the master unit will command the slave units to the proper voltage and current. Each unit will display its own individual voltage and current. Installation requires setting jumpers, placing included 37-conductor cables between the UID47 and power supplies, and wiring the power supply outputs in either parallel or series.

The UID47 can be used as an interface for connecting control and monitoring lines to external circuitry. It also contains an area on the printed circuit board for interconnecting wires and placing components for specific user applications.

Key features of the UID47 option are as follows:

  • Compatible with all Magna-Power Electronics power supplies
  • Interface for series and parallel master/slave operation
  • User configurable screw terminal connector
  • Pad area for custom circuitry
  • Qty (2) 6-foot 37-pin shielded cables included
Table 2.6 Specifications for Universal Interface Device 47 (UID47)
Master 1: DB-37, Female
Master 2: DB-37, Female
Slave: DB-37, Female
User Interface Circuitry: 10-pin plug connector
Ambient Operating Temperature 0°C to 50°C
Storage Temperature -25°C to +85°C
1.24” H x 7.14” W x 4.01” D
(3.15 x 18.14 x 10.19 cm)
Weight 0.5 lbs (0.23 kg)

For more detailed information about the UID47, refer to its User Manual.

2.7.4. RS485 (Converter)

The industrial RS232 to Addressable RS485 Converter allows non-addressable, “dumb” RS-232 devices to be connected on an addressable RS-485 network. The master node controls all communications to connected devices. By distributing the switching intelligence along the RS-485 network, wiring cost savings are substantial compared to a single switched “star” configuration.

Devices can either be polled by the master node or request access to the bus through a RS-232 handshake line. This provides a versatile system for interconnecting devices that are designed for point to point communications. Because the units communicate using standard RS-485 signals, RS-232 devices can form their own network or be added to an existing system. Up to 32 nodes at up to 4000 feet can be on one bus without a repeater, and the 485DSS’s addressing scheme allows up to 256 units on a single network with repeaters.

2.7.5. USB (Converter)

The industrial RS232 to USB Converter offers instant I/O expansion for peripheral device connectivity. An out-of-the-box (external) alternative to PCI cards, Edgeport makes it easy to add serial port to a PC, server or thin client in minutes without opening the chassis, reconfiguring or rebooting the system.

The USB Converter device plugs directly into the back of the power supply, creating a seamless USB interface. Feature-rich design, reliability and unmatched operating system support make Edgeport USB-to-serial converters ideal for mission-critical enterprise applications. USB cable included along with associated drivers on the Magna-Power Electronics software CD.