EA-EL 9750-20 B 3U Programmable Electronic DC Load – 750V / 20A / 1200W

The EA-EL 9750-20 B 3U is a high-voltage programmable electronic DC load from the EA-EL 9000 B series, delivering 1200W continuous power with no derating up to 35°C. Housed in a 3U 19" rack enclosure, it operates from 0‑750V DC and 0‑20A DC, with a resistance range of 3.5‑1100Ω. Four operating modes are supported: constant current (CC), constant voltage (CV), constant power (CP), and constant resistance (CR).

An FPGA-based digital control circuit enables advanced functions including an arbitrary waveform generator, a table-based XY function for simulating nonlinear internal resistances, battery discharge testing (with elapsed time and Ah recording to USB), and MPP tracking for photovoltaic applications—featuring four simulation modes and a 100-point irradiation table for detailed solar inverter analysis.

Manual operation is via a color TFT touch panel with multilingual support (EN, DE, RU, CN). Connectivity includes galvanically isolated USB and analog interfaces (0‑5V/0‑10V switchable), plus a slot for pluggable fieldbus modules (CAN, CANopen, Ethernet, EtherCAT, Profibus, Profinet, RS232, ModBus TCP). Rear panel terminals provide DC input, remote sense, Share Bus for parallel/two-quadrant operation, and master‑slave bus (RJ45) for multi-unit synchronization.

Key specifications: voltage accuracy ≤0.1%, current accuracy ≤0.2%, power accuracy ≤0.5%, resistance accuracy ≤1% of max. resistance + 0.3% of rated current. Load regulation ≤0.1%, rise time ≤50µs. Protections include OVP, OCP, OPP, OT, PF. Temperature‑controlled fans allow 0‑50°C operation. Weight 9kg, dimensions 19"×3U×464mm. Remote control via SCPI/ModBus; Windows software and LabView VIs included.

Key Features

• 750V / 20A / 1200W with CV, CC, CP, CR modes, no derating up to 35°C.
• Advanced digital control: arbitrary waveform generator, nonlinear resistance simulation (XY function).
• Integrated battery test with Ah recording to USB.
• MPP tracking for PV tests: four modes including 100-point irradiation table.
• Intuitive touch panel with multilingual HMI.
• Flexible interfaces: USB, analog, and slot for fieldbus modules (CAN, Ethernet, Profibus, etc.).
• Scalable architecture: master‑slave bus and Share Bus for parallel/two-quadrant systems up to 72kW.
• High accuracy: ≤0.1% voltage, ≤0.2% current, ≤0.5% power.
• Included software: Windows control app, LabView VIs, SCPI/ModBus support.