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Home | Products | Regenerative AC/DC Electronic Load  | RLS Regenerative Load Simulator
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RLS Series

Compact Regenerative AC & DC Load, 6kVA to 1.29MVA

Buy / Rent
Datasheet

The RLS Series is regenerative 4-Quatrant Electronic Load is designed to simulate real world AC/DC linear or non-linear load with Regenerative capability.  

The RLS offers 6kVA to 24kVA in 4U size and scalable up to 1.29MVA with cabinet system. The 4-quadrant load has several AC and DC emulation modes and flexible configurations of single, split and 3-phase operation, and steady-state or transient executions ideal for testing.

Power:

Up to 756kVA+

Voltage:

Dual Range30-350Vac
L-N /0-606Vac L-L / 0 – ±475Vdc

Frequency:

Up to 1,200Hz

Why Choose RLS Series

High Power Density

Compact 4U design with scalable power up to 1.29MVA/MW

Regenerative Power

Greater than > 90% energy efficiency saves energy and costs

Versatile Load Performance

Several Load Modes: Constant Current (CC), Constant Resistive (CR), Constant Power (CP)

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Ultra Flexible Configuration

AC, DC input and 6-form configurations for multi-channel capability

Key Features

  • Single, Split, Three-Phase
  • Modular, scalable power 6kVA up to 24kVA in 4U
  • Up to 216kVA in a single 19″ cabinet
  • Constant Power Voltage Range: 30-350Vac L-N /0-606Vac L-L / 0 – ±500Vdc
  • 15Hz-1200Hz
  • Full power available in AC and DC input capability; Flexible 6 Form Configuration
  • Full Galvanic Isolation protects users and units under test
  • 37% Extra current over competitor
  • Advanced waveform capture & scope function
  • Special inrush current application transient programming
  • AC Modes: Constant Current, Constant Power & Apparent Power, Constant Resistance, Constant Voltage, CC+CR, CC / CS Rectifier Mode 1ø & 3ø
  • DC Modes: Constant Current, Constant Power, Constant Resistance, Constant Voltage, CR+CC
  • Harmonics measurement for voltage and current on all phases
  • Sine, Square, Triangle and Arbitrary waveforms
  • 3 Phase AC input with Active PFC
  • 200 programs for transient testing (List, Pulse, Step Modes)
  • 380V-480V 3 Phase AC input with Active PFC
  • Precision True-RMS metering of Volts, Amps, Power, VA, Power Factor and Crest Factor
  • Precision Voltage Programming – 0.02% with Continuous Self Calibration (CSC)
  • Safety Programmable Protection Limits for real power, apparent power, over voltage and over temperature
  • Extensive Analog and Digital I/O for system integration
  • RS-232, USB, Modbus, LAN, CAN, GPIB, SCPI compatibility; IVI Instrument Drivers
  • CE (EMC/Safety) Marked
  • Built-In SmartSource Suite Remote Control Platform

Powerful, Highly Efficient Load Simulation

AC / DC Load with Constant Power Voltage Range

Accurately simulate the power grid with seamless transition of voltage ranges. A single constant power voltage range for both higher current at lower voltage and higher voltages at lower currents eliminating the need to switch between voltage ranges.

  • Wide operating envelope
  • More current at lower voltage
  • Test broad range of power

Highest Current Availability for AC Load Simulation

The RLS provides a wide range of current eliminating the risk of over or under sizing the power source.
The RLS provides a max current per phase of 48Arms available up to 166.7Vrms from 45 to 200Hz, providing up to 37% more current at lower voltage
compared to a typical unit on the market that maxes out at 35A/phase.
Benefits:

  • 48Arms current rating at lower voltage
  • Reduces capital investment
  • Test Constant Power AC input products down to lowest rated input voltage
Industries Highest Current in Split phase, three phase mode
Full-4-Quadrant-Operation-for-Leading-Lagging-Power-Flows
Full-4-Quadrant-Operation-for-Leading-Lagging-Power-Flows

4 Quadrant Operation for Leading & Lagging Power Flows

The RLS Series supports testing PV inverters, V2G, EV Chargers, EVSE, batteries, UPS, and AC/DC power supplies. A key advantage of the RLS Regenerative Load is its ability to operate in all four quadrants using programmable phase shift in CC or CS modes. Compared to 2-Quadrant non-regenerative AC loads, the RLS series allows simulation of inductive and capacitive loads to fully test AC power sources, as shown in the leading and lagging power factor examples.

Simulate Real world Load Including Circuit Emulation

Regenerative AC/DC Electronic Load capability with both AC and DC operating modes pushes the boundaries of your test environment. Simulate linear and non-linear loads (including rectified), inductive and capacitive loads.

  • AC Modes: Constant Current, Constant Power & Apparent Power, Constant Resistance, Constant Voltage, CC+CR, CC / CS Rectifier Mode single or three phase
  • DC Modes: Constant Current, Constant Power, Constant Resistance, Constant Voltage, CR+CC
  • Additional CE Mode
Built-in Advance Digital Scope and Measurement - ELZ

Built-in Advance Digital Scope and Measurement

Advance scope function captures voltage and current time domain signals, perfectly synchronized to the output frequency. Voltage and current displayed with accurate phase relationship. Display output waveforms on front panel or in Web browser.

The built-in Measurement eliminate the need for an external power analyzer by measuring voltage and current harmonics. Harmonics information is displayed in either bar charts or detailed table format for easy viewing and analysis. Data is displayed for each phase or all three phase simultaneously.

  • AC, DC configurations
  • Simultaneously test AC and DC,on separate phases
  • Full galvanic isolation from facility AC input to output and between output phases/channels also protects the user and the UUT.

SmartSource Suite Remote Control Platform

SmartSource Suite, our proprietary built-in platform that allows full remote Programming, development, and execution of test sequences in real-time. Data-logging, Programming control, and manage testing using the intuitive embedded web browser interface on any mobile device.

  • Access on any web browser in real-time, no need for installing of drivers or software
  • Real time Scope, Data logging and Power Analysis tools
  • Enhanced visualization and reporting tools with
  • Pre-written Test sequence for Aerospace, Defence, EV, Grid Standards etc.
Low current

Low Leakage Optimization Option (M26007)

  • Reduced AC input common-mode capacitance minimizes leakage current to earth
    Prevents nuisance tripping of RCD*/GFCI protection devices.
  • Maintains full voltage and current source operation
    Simplifies integration into protected laboratory and production environments
  • Ideal for installations with sensitive protection devices or strict leakage current requirements
  • M26002 combines both reduced output capacitance AND low leakage (M25057 and M26007 RCD* (Residual-Current Device): Residual-current circuit breaker or ground fault circuit interrupter)

Featured Video

RLS Series Regenerative Load Product Intro Video

Watch Now

Bench or Rack Mount Models

Model Rated Power (VA) Output Form Voltage Ranges (VAC/VDC) Current (AAC/ADC) Input Power Form Rack Height CTA
360RLS 6000 1,2,3 Ø 350 (L-N) / 500 17.0 / 17.30 3Ø 4U Buy / Rent
390RLS 9000 1,2,3 Ø 350 (L-N) / 500 25.0 / 21.0 3Ø 4U Buy / Rent
3120RLS 12000 1,2,3 Ø 350 (L-N) / 500 34.0 / 21.0 3Ø 4U Buy / Rent
3150RLS 15000 1,2,3 Ø 350 (L-N) / 500 42.0 / 21.0 3Ø 4U Buy / Rent
3180RLS 18000 1,2,3 Ø 350 (L-N) / 500 42.0 / 21.0 3Ø 4U Buy / Rent
3210RLS 21000 1,2,3 Ø 350 (L-N) / 500 42.0 / 21.0 3Ø 4U Buy / Rent

Parallel Systems

Model Rated Power (VA) Output Form Voltage Ranges (VAC/VDC) Current (AAC/ADC) Input Power Form Rack Height CTA
3240RLS-4 24000 2,3 Ø 350 (L-N) / 500 68.0 / 42.0 3Ø 15U Buy / Rent
3300RLS-4 30000 2,3 Ø 350 (L-N) / 500 84.0 / 42.0 3Ø 15U Buy / Rent
3360RLS-4 36000 2,3 Ø 350 (L-N) / 500 84.0 / 42.0 3Ø 15U Buy / Rent
3420RLS-4 42000 2,3 Ø 350 (L-N) / 500 84.0 / 42.0 3Ø 15U Buy / Rent
3630RLS-4 63000 2,3 Ø 350 (L-N) / 500 126.0 / 63.0 3Ø 15U Buy / Rent
3840RLS-4 84000 2,3 Ø 350 (L-N) / 500 168.0 / 84.0 3Ø 28U Buy / Rent
31050RLS-4 105000 2,3 Ø 350 (L-N) / 500 210.0 / 105.0 3Ø 28U Buy / Rent
31260RLS-4 126000 2,3 Ø 350 (L-N) / 500 252.0 / 126 3Ø 28U Buy / Rent
31470RLS-4 147000 2,3 Ø 350 (L-N) / 500 294.0 / 147 3Ø 40U Buy / Rent
31680RLS-4 168000 2,3 Ø 350 (L-N) / 500 336.0 / 168 3Ø 40U Buy / Rent

  • Notes:

    • For higher power levels up to 756kW, contact Factory for more details.
    • All RLS models have a single voltage range with constant power profile. This eliminates the need for switching between a high and a low voltage range. If desired, a low voltage range can be simulated.
    • Maximum current ratings shown are available up to maximum power point. Voltage and Current follow constant power profile so higher current at lower voltage and lower current at higher voltage is available.
    • Three phase input: 380 ~ 480 VAC ± 10% input range. All models have active power factor corrected AC inputs. Models above 12kW require 380~480Vac Input service to deliver full power. 208-240Vac models are not available at this time.
    • 19 Inch Cabinet not included with parallel system kits. Contact us for integrated cabinet systems.
    • Lower power RLS models can be upgraded to higher power levels using our POWER FLEX upgrade program.
    • Contact customer service for details.
Title
Document Type
RLS Series Regenerative AC & DC Load Datasheet
Datasheet

FAQ

The RLS is Regenerative 4-Quadrant AC & DC Load  Simulator is designed to emulate real-world normal and abnormal load conditions for testing a wide range of AC or DC power generating or conversion equipment. The RLS’s high-power density provides up to 12kVA/kW in a 4U chassis and can parallel up to 24kVA/kW

It is only electronic load.

An electronic load is a programmable device that draws controlled current or power from a source to test power converters, batteries, and chargers, under various load conditions.

An electronic load mode is optimised for precise load emulation and dynamic current control. RLS simulates AC and DC loads for testing PV inverters, V2G, EV Chargers, EVSE, batteries, UPS, and AC/DC power supplies. Fully operate in all four quadrants using programmable phase shift in CC or CS modes.

This allows simulation of inductive and capacitive loads to fully test AC power sources

The RLS Series is used in:

EV Charger Load Testing, On Board Chargers (OBC), Wallboxes, V2G, V2H, V2X, and EV Charging Cables

Solar PV/Grid-Tied Inverters RLC Loading for Anti-Islanding

Energy Storage Systems (ESS), Home ESS Load Testing

UPS Products and PDUs AC Load Testing

EV Battery Discharge Testing

Aerospace Power and Converter Testing

Utility Power Quality and Grid Usage

Burn-In Testing 

The RLS Load mode offers following four main operating modes with both RMS and Real-time modes as well as a rich set of features in each mode. 

Constant Current (CC) 

Constant Resistance (CR) 

Constant Power & Apparent Power(CP)

Constant Voltage

CC + CR 

CC/CS Rectifier mode in AC

Programmable phase shift between input voltage and load current allows for ±1 or 0 Power Factor control. Refer manual for more information

Quick Links:

Industries:

Contact:

CALTEST INSTRUMENTS PVT LTD

NMR Green Nest, Ground Floor
Hitech Defense and Aerospace Park, Bangalore North,
Bandi Kodigehalli
Bangalore 562149, KA.

info@caltestindia.com
+919845007602

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