The high-end, large-capacity DC electronic load "QL-D series" is an electronic load device that adopts the oscilloscope-like UI and high-speed current control circuit method that have been well received in conventional electronic loads, and has improved usability and basic performance of the electronic load. 

It has been updated in every respect from the 34000A series and can be adopted as a successor model.

The test environment at high capacity is influenced by the inductance of the load cable, and depending on how it is used, it can lead to damage to the electronic load device. In order to be able to deal with such external factors, the high- speed current control circuit method adopted in the Load Station series has been further developed and adopted in the QL-D series.

By speeding up the load response, ensuring stable operation of instantaneous overcurrent at high currents and preventing abnormal oscillation caused by cable inductance when the cable wiring length is extended, it is now possible to use it with greater peace of mind. 

Seven features of the front panel that make it easy to use 

Compact body with ample capacity. Three models (150V, 600V, 1000V) with different rated voltages ranging from a minimum of 5kW to a maximum of 25kW are available. The 150V type supports a large current of up to 2000A. Recommended for those who want large capacity at low cost. 

It has 12 load modes (CC, CR, CV, CP, Short, CC+CV, CP+CV, EX (CC, CV, CP), EXT (CC+CV, CP+CV) and 6 operation modes (Normal, Dynamic, Sequence, Sweep, MPPT (optional), current limit), which can be combined to perform a wide variety of load tests. 

■The dedicated operation modes "CC+CV mode" and "CP+CV mode" are standard features that are ideal for evaluating battery characteristics. They are also suitable for evaluating the discharge characteristics of large capacity batteries. 

■The Vlimit function and elapsed time measurement function are used to turn off the load at a specified voltage or discharge time, providing battery protection. 

■The built-in load-off function turns the load off when the specified integrated value is reached using the integration function (current: AH and power: WH). 

High-speed current control technology has achieved a high-speed response of up to 50A/μs (150V type).With a minimum response time of 5μs, it achieves a fast rise time even with large capacity and current. 

*Generally, the slew rate is the time it takes for the load current to change from 10% to 90% of its maximum value, and the rate of change of the current. 

It has 4,096 words of built-in memory for sequence operation, and allows you to transfer data or create sequence programs directly from the front panel. Data can be transferred via various communication interfaces, as well as read and saved from USB memory (CSV file format).

The execution time and slew rate settings for each step are common, with the execution time ranging from 1msec to 10min, and the slew rate setting is only available in CC mode, and is the speed of current change (A/μs) when transitioning from step to step. 

The Sweep mode is a function that can measure voltage and current while finely changing (sweeping) the load current in the three load modes of CC, CR, and CP, and plot the measurement results on the LCD panel in real time. It can perform overcurrent characteristic tests (drooping characteristics) and overpower characteristic tests on SW power supplies, and IV characteristic tests on secondary batteries, etc., with the electronic load alone. The measurement data can be saved in CSV format to a USB memory. Since it has a judgment function, it can be used in OCP and OPP test modes in addition to characteristic evaluation, just like the 34000A series. 

An optional MPPT function (hill climbing method) is available, which is necessary for testing solar panels (PV) and the like. This is a control method that continues to adjust the operating voltage and current using CC mode until maximum power is obtained. During execution, a chart (graph) is displayed in real time on the LCD panel, so you can monitor the operating status during execution. 

Equipped with external analog and digital controls ideal for PLC control

Equipped with external digital control (EXT I/O) and external analog control (EXT INPUT) for PLC control. Supports load mode switching and analog control load setting (CC, CV, CP) by 0-10Vdc. In addition, there is a current and voltage monitor (isolated) and measurement values ​​can be read, and CC+CV and CP+CV modes can also be controlled from a PLC. 

Remote Sensing Function

Remote sensing allows you to change the voltage reference point for voltage measurement and CR, CV, and CP modes from the load input terminal to any sensing point. By setting the sensing point to the end of the test object, you can reduce the effects of voltage drops caused by the resistance of the load cable and stabilize the load mode that serves as the voltage reference. 

Space-saving and lightweight compared to conventional products

Compared to the conventional 34000A series, the volume is reduced by up to 70% (compared to the 5kW model) and the weight is reduced by 65%. The width has also been reduced from 647mm to 430mm, making it easier to secure installation space. 

The standard model is the caster type, but the 5kW model also comes in a benchtop type in addition to the caster type. It uses rubber feet similar to those found on general benchtop type power supplies, making it possible to build a test environment on a table.

In addition, it can be easily mounted on a rack by simply removing the rubber feet, making the benchtop type ideal for system upgrades using a 19-inch rack. 

Box-type safety cover included (standard on all models)

Anchor bolt fixing brackets are available for earthquake resistance (optional)