Chroma 63800R Series offers AC electronic loads with regenerative capability, featuring three models with power ratings of 9kVA, 12kVA, and 15kVA. This series boasts a high power density design, providing a maximum load capacity of 15kVA within a compact 3U chassis. To accommodate higher power rating test requirements, you can parallel multiple units for increased load capacity while utilizing master-slave control.

The Chroma 63800R Series presents a highly efficient energy-saving solution with its regenerative feature, making it ideal for a broad spectrum of renewable energy applications, including ESS, hybrid PV inverters, AC EVSE, and bidirectional on-board chargers (BOBC) for V2L and V2H applications.

In contrast to traditional AC loads for UPS testing, the 63800R Series eliminates waste heat generation, significantly reducing electricity costs due to its regenerative capability. Furthermore, it meets the requirements of the IEC 62040-3 standard for UPS testing.

The Chroma 63800R Series utilizes advanced all-digital control technology and introduces a Stand-By function to handle rapid fluctuations in the voltage source of the Device Under Test (DUT). This function keeps the load in an active state when the DUT is in standby or off and instantly starts drawing power when the voltage source is activated. This functionality lends itself well to the implementation of fully automated testing in smart factories.

In addition to basic functions such as CC, CP, and CR, the Chroma 63800R Series offers advanced operating modes like Rectified and phase Lead/Lag mode. It can also simulate SCR and TRIAC component characteristics with its unique half-cycle load function.

The 63800R Series features a 5" LCD display with an intuitive user interface for seamless operation. Connectivity options include USB, LAN, and optional GPIB or CAN interfaces for swift remote and digital control via a PC using Chroma's SoftPanel software. Additionally, Chroma provides instrument drivers for LabVIEW-integrated system control.

The 63800R Series Regenerative AC Load is equipped with a touchscreen interface, providing an easy-to-use UI that allows users to quickly configure and operate various settings. Advanced AC load functions are conveniently located under the "More Settings" option in the upper-right corner. The display mode can expand the measurement values to full screen, making it easy to view.

The regenerative design of the 63800R Series incorporates a comprehensive set of protective measures. When the 63800R Series detects abnormalities in the grid-side AC input, such as overvoltage, undervoltage, frequency anomalies, three-phase imbalance, or excessive current, the device issues an immediate warning and activates trip protection to comply with grid protection mechanisms.

Chroma 63800R Series Regenerative AC Electronic Loads offer a full range of AC load simulation functions. Advanced load functions include userdefined waveforms, List mode, Stand-By mode, half-cycle loading, Instant Load On, and Response Speed adjustment, providing a versatile toolset for dynamic and precise load simulation.

General Load

The 63800R Series offers a complete set of Constant Current (CC), Constant Power (CP), and Constant Resistance (CR) modes. In CC and CP modes, users can set the load's power factor (PF) or crest factor (CF), and use the Priority setting to define which parameter takes precedence when both are set simultaneously. In CR mode, the PF is fixed at 1, enabling simulation of linear impedance behavior with fast response to DUT source changes, suitable for applications like transient load tests for voltage interruption.

Rectified Load

For rectified or nonlinear loads such as traditional inverters, UPS systems, switch-mode rectifiers, audio/lighting control equipment, and electromechanical devices using variable frequencies, the 63800R Series offers dedicated CC Rectified and CS Rectified modes. By setting an appropriate CF value, the load can generate the required peak current, and with stable slew rate control, the system can accurately reproduce a wide variety of non-sinusoidal current waveforms.

Inductive and Capacitive Loads

The CC Lead/Lag and CS Lead/Lag modes allow users to simulate inductive or capacitive load characteristics by adjusting the phase shift degree (Deg) between current and voltage under constant current or constant apparent power conditions. By making the current lead or lag behind the voltage, these modes accurately reproduce the behavior of real-world equipment affected by passive components.

Chroma 63800R Series Regenerative AC Loads are equipped with a half-cycle load function in CC Rectified mode. This function is capable of supplying positive half-cycle, negative half-cycle load currents, and even 90-degree Leading Edge and Trailing Edge half-cycle loads, replicating the features of SCR and TRIAC switches. With this function, users can simulate load characteristics for household appliances, protective switches, and other devices employing SCR or TRIAC components.

The 63800R Series feature a novel Stand-By fast response functionality, made possible by advanced control algorithms and precise, rapid circuit detection. In scenarios where the circuit is suddenly opened or the voltage source is interrupted, the load can quickly switch to a stand-by state by detecting the disappearance of the voltage from the DUT. In addition, the new Instant Load On function (Load On Immed.) allows the load to engage immediately as soon as the voltage source is activated, which enables load startup testing with near-zero delay. Users simply configure the load settings and activate Load On, after which the source can be interrupted or resumed at any point during the test. As a result, the 63800R Series is especially suitable for AC EVSE testing, including dynamic load testing, OCP/OPP load testing, card-swipe charging tests, as well as load startup and backup power switching tests for inverters and UPS systems.

The Chroma 63800R Series offers high versatility through a Response Speed adjustment feature, enabled by a precision digital control algorithm that arranges the system response bandwidth. Users can simply switch between different load response types with a single setting, adapting the load behavior to suit a wide range of AC voltage-source DUTs. When testing voltage sources with high harmonic content, the Slow mode (designed for distorted voltage sources) delivers stable load performance well-suited for early development stages, when the voltage waveform may not yet meet standard sine wave criteria. Conversely, during later stages of voltage source development where precise current waveform control is essential, Fast mode enables highly accurate current loading. This is ideal for applications such as rectified load simulation, phase-lead/ lag, half-cycle, user-defined waveform, and zero-delay startup loading.

For better replication of real-world load current behavior, the Chroma 63800R Series features a user-defined waveform (UDW) function^*1. This allows users to capture current waveforms and data using an oscilloscope and store them in the instrument via the SoftPanel software's User Waveform feature^*2. These stored waveforms can then be reproduced during load testing, providing targeted scenario simulations for voltage source DUTs. The UDW function is especially useful for simulating diverse load characteristics in automotive applications, such as BOBCs and inverters for V2L testing.

The UDW function supports two modes: VAL and PU, each allowing storage and use of up to 200 waveforms. In VAL mode, the instrument replicates the actual current waveform exactly as captured. In PU mode, the waveform shape is normalized and scaled according to the userspecified peak current level. Additionally, users can manually edit current waveforms in Excel by defining one complete cycle (typically 1024 points) of current data. This custom waveform can then be imported into the instrument for flexible, scenario-based load testing.

*1 Supported on FW 1.10 and later; not supported in Split Phase mode.
*2 Not yet released; this function can be operated via SCPI commands.

The 63800R Series supports advanced programming functionality via List Mode^*. Users can define up to 100 individual sequences to create a continuous, programmable load profile. Each sequence can be configured independently, with the option to control execution duration based on either a fixed time or a specified number of load cycles, allowing flexible combinations for dynamic load simulation. In List Mode, the initial sequence allows editing of the starting load phase angle, while subsequent sequences automatically follow the phase and angle of the voltage source. This design simplifies the creation of dynamic current waveforms that respond to changing load conditions in real-time.

*This function is only supported on FW versions 1.10 (inclusive) and above, and is not supported in Split Phase mode.

Chroma 63800R Series Regenerative AC Loads offer a new energy-efficient and carbon-saving solution for AC EVSE testing, thanks to their high power density and efficient energy recovery capability. Traditional load banks not only have a large footprint but also convert consumed power into heat, leading to significant energy consumption and requiring cooling systems to prevent overheating. In contrast, the Chroma 63800R Series achieves energy recovery with an efficiency of up to 89%. For instance, when operating at full load power, a single unit can save 116,946 kWh of electricity per year, which is equivalent to reducing 45,258 kg (99,777 lbs) of carbon emissions^*1. The 63800R comes equipped with comprehensive CC, CP, and CR load modes and complies with the standardized CCID/RCD leakage current requirements for AC EVSE testing^*2.

Note*1: According to the National Energy Information Administration, 1 kWh of power consumption results in approximately 0.855 pounds (0.387 kilograms) of carbon emissions.
Note*2: Additional of Chroma 63800R dedicated Inrush Current Limiter Box is required for AC EVSE and AC EV Charger testing applications.

For V2H and V2L testing, EV charger manufacturers have traditionally relied on using actual household appliances as loads. This approach is not only cumbersome and time-consuming but also requires substantial costs and floor space. The 63800R Series solves this with seven load modes (CC, CP, CR, CC/CS Rectified, CC/CS Lead/Lag) and advanced features including half-cycle loading, Stand-By mode, Response Speed adjustment, UDW, and List Mode. This enables accurate simulation of load current characteristics across an array of household devices—from hair dryers, coffee machines, and TVs to dimmable and speed-controlled loads like lighting and fans. As a result, a single 3U unit eliminates the need for bulky appliances by switching easily between different load profiles, boosting test efficiency while cutting costs and saving space.