KIKUSUI PXZ Series Regenerative Electronic Load
The KIKUSUI PXZ Series is a high-capacity regenerative electronic load designed for efficient testing of high-power DC devices and power-electronics systems. Each model provides 20 kW of rated load power in a compact 3U chassis.
Unlike a conventional electronic load that primarily converts absorbed power into heat, the PXZ Series regenerates absorbed energy for consumption within the facility. Regenerative efficiency exceeds 90% at load power of 6 kW or more, helping reduce energy loss and heat generation during high-power testing.
20 kW / 3U
High-capacity regenerative loading in a compact chassis
Up to 1500 V
Four models for low-voltage/high-current through high-voltage testing
90%+ Regeneration
High-efficiency on-site energy regeneration at load power of 6 kW or more
Up to 500 kW
Parallel operation of up to 25 PXZ units
Four operating modes—constant current (CC), constant voltage (CV), constant resistance (CR), and constant power (CP)—are supported. The PXZ Series also provides programmable sequence operation, pulse and sine functions, configurable I-V characteristics, synchronization, data acquisition, external control, and LAN, USB, and RS232C interfaces for integration into automated test systems.
The PXZ Series is intended for on-site regenerative operation. It is not a grid-interconnection device designed to return regenerated power to the utility grid.
20 kW Regenerative Load in 3U
Each PXZ model provides 20 kW of rated load power in a compact 3U chassis, supporting high-capacity DC testing while reducing rack-space requirements.
High-Efficiency Power Regeneration
Regenerative efficiency exceeds 90% at load power of 6 kW or more. Absorbed energy can be reused within the facility rather than being dissipated only as heat.
CC / CV / CR / CP Operation
Constant-current, constant-voltage, constant-resistance, and constant-power operating modes support a wide range of DC load-test conditions.
Dynamic Load Functions
Pulse operation is available in CV, CC, and CR modes, while sine operation is available in CV and CC modes. Both support frequencies from 1 Hz to 1000 Hz.
Programmable Sequence Testing
Up to 30 programs and a combined maximum of 10,000 steps can be stored. Step execution time ranges from 1 ms to 3,600,000 seconds for automated load-profile testing.
I-V Characteristic Function
Arbitrary I-V characteristics can be defined using 3 to 100 points in CC or CV operation, supporting evaluation against device-specific voltage-current characteristics.
Pre-Charge Function
A dedicated pre-charge function can apply 5% of rated current in CC mode until the selected CV voltage is reached, supporting controlled charging of DC-link capacitors before discharge testing.
Parallel and Synchronized Operation
Up to 25 PXZ units can be operated in parallel for systems up to 500 kW. Load on/off, measurement, and sequence timing can also be synchronized across multiple units.
Integrated Measurement and Data Logging
The PXZ supports voltage, current, power, integrated current, and integrated power measurement together with configurable measurement triggering and data logging.
Standard System Interfaces
LAN, USB, RS232C, isolated external analog control, and configurable digital I/O are provided for integration with automated test equipment and PLC-based systems.
VMCB Multi-Channel Control
KIKUSUI's Virtual Multi-Channel Bus function allows multiple PXZ units to be grouped for efficient remote control and monitoring over a network.
Comprehensive Protection
Protection functions include overvoltage, overcurrent, overpower, undervoltage, overtemperature, communication watchdog, reverse-connection, AC-line, sensing, external-alarm, and parallel-operation protections.
High-power DC power supply evaluation
EV and automotive power-electronics testing
OBC and inverter DC-link discharge testing
DC/DC converter evaluation
Rechargeable battery discharge and I-V characteristic evaluation
High-voltage power-conversion system testing
Automated production and endurance testing
Data-center and IT power-supply evaluation
PXZ Series Model Comparison
| Specification | PXZ20K-50 | PXZ20K-500 | PXZ20K-1000 | PXZ20K-1500 |
|---|---|---|---|---|
| Rated Power | 20 kW | 20 kW | 20 kW | 20 kW |
| Operating Voltage (DC) | 3 V to 50 V | 10 V to 500 V | 20 V to 1000 V | 30 V to 1500 V |
| Rated Current | 800 A | 120 A | 60 A | 30 A |
| Maximum Settable Voltage | 52.5 V | 525 V | 1050 V | 1575 V |
| Maximum Settable Current | 840 A | 126 A | 63 A | 31.5 A |
| CC Setting Resolution | 0.1 A | 0.01 A | 0.005 A | 0.002 A |
| CV Setting Resolution | 0.005 V | 0.05 V | 0.1 V | 0.1 V |
| CC Rise Time (TYP) | 1 ms | 1 ms | 1 ms | 1 ms |
| CC Fall Time (TYP) | 1 ms | 1 ms | 1 ms | 1 ms |
| Remote-Sensing Compensation (TYP) | 10% of rated voltage | 10% of rated voltage | 10% of rated voltage | 10% of rated voltage |
| Weight | Approx. 41 kg / 90.39 lb | Approx. 38 kg / 83.78 lb | Approx. 37 kg / 81.57 lb | Approx. 37 kg / 81.57 lb |
Maximum input current and maximum input voltage are limited by the 20 kW maximum input power.
Shared Functional Specifications
| Operating Modes | CC, CV, CR, CP |
|---|---|
| Regenerative Operation | More than 90% regenerative efficiency at load power of 6 kW or more; designed for on-site regeneration |
| Parallel Operation | Up to 25 units / 500 kW; consult KIKUSUI for systems using more than 10 units |
| Sequence Programs | Up to 30 programs |
| Sequence Steps | Up to 10,000 total steps |
| Sequence Step Time | 1 ms to 3,600,000 s |
| Pulse Function | CV / CC / CR, 1 Hz to 1000 Hz |
| Sine Function | CV / CC, 1 Hz to 1000 Hz |
| I-V Characteristic Function | CV / CC; 3 to 100 configurable points |
| Measurement Count | 1 to 65,536 |
| Measurement Interval | 0.1 ms to 3600 s |
| Communication | LAN, USB device/host, RS232C |
| LAN Protocols | SCPI-RAW, SCPI-Telnet, HiSLIP, VXI-11 |
| LAN Standard | LXI Version 1.5 |
| External Control | Isolated analog control plus configurable isolated digital input/output |
| AC Input | 200–240 Vac or 380–480 Vac nominal, three-phase, depending on input-voltage model |
