PEL-2000A is a programmable DC electronic load that can operate in constant current, constant voltage, and constant resistance modes. It can also simulate various dynamic load conditions and edit load waveforms through sequence functions for parameters such as load voltage, current, rising and falling slopes, current level, and duration. It also provides external waveform signal control and V&I monitoring functions. The storage of test parameters and status can reach up to 120 sets, and the system can be called out and used at any time from the internal storage unit EEPROM of the instrument according to automatic testing requirements.

The PEL-2000A series includes two main control frames, PEL-2002A (capable of accommodating dual modules) and PEL-2004 (capable of accommodating four modules), with modular design to assist users in retaining expandability that may be used for higher power requirements in the future. Currently, four load modules are available: PEL-2020A (200W dual channel load module 100W * 2); PEL-2030A (280W dual channel load module 30W+250W); PEL-2040A (350W single channel load module); PEL-2041 (350W Single Channel Load Module), represented by PEL-2004A, can form up to 8 channels for synchronous use, with a power range of 200W~350W, a current range of 0~70A, and a voltage range of 1~500V. Users can choose the load module and control module according to their actual needs to combine or self assemble the load system, which can synchronously execute the application of multiple electronic load modules for load pulling. At the same time, each module adopts isolation and ground floating connection methods to avoid short circuit loops; Nowadays, the green energy industry is booming, and the PEL-2000A series meets the testing needs of various consumer electronics and automotive energy equipment. Through the parallel control function of external flat cables, it can simultaneously control up to five main frames and achieve a total power consumption of 7kVA.

The PEL-2000A series is equipped with RS232, USB, GPIB (optional) interfaces, GO/NG interfaces, as well as driver programs and related testing software examples for LabView, VB, C, C++, etc. The PEL-2000A series is mainly used for testing the performance of AC/DC power supplies, DC/DC power modules, chargers, and power electronic components with multi-channel or single channel output. It provides a fast and effective testing solution for design and development, production line testing, and product inspection operations. At the same time, it has OPP, OCP, OVP, OTP, low voltage protection, and positive and negative polarity protection functions, which greatly improve the reliability of the product and make it a reliable product for engineering testing and automatic testing environments.

A. AUTOMATICALLY SEQUENCE FUNCTION

Each channel can be individually configured with fast sequences, with a maximum of 120 points and delay times per channel. The minimum step size can be set to 100us. Under the same control mode, multi-channel sequence control can be performed simultaneously, and the loading behavior of switched power supplies can be simulated. This is one of the powerful features of the PEL-2000A series, which can be applied to the simulation of multi-channel output power supplies. In dynamic mode, the speed of setting the load current or pulse load resistance at its two preset levels can reach 25us per step, which is usually used as a standard test procedure to verify the response of the load to rapid changes.

The upper right image is an example of a single channel switched power supply simulating rapid load changes. By using a digital oscilloscope in conjunction with a current measuring rod to capture the current waveform, the PEL-2000A programmable DC electronic load sequence programming function can be used to perform product performance testing on exchange power supplies

B. MULTIPLE OPERATING MODE

C. C. (Constant current operation mode)

In constant current mode, the load unit draws in current according to the set value, and the current remains unchanged regardless of the voltage. In CC mode, there are two gears: high (HI) and low (LOW). The low gear has a higher resolution than the high gear and is used for precision testing. When the current exceeds the low gear range, the configuration file needs to be switched to the high gear. The PEL-2000A series programmable DC electronic load can withstand the maximum rated power of this model in the low range. CC mode includes two main modes: static and dynamic. Static mode is used for stability testing, while dynamic mode is used for testing instantaneous loads. Go/No Go functionality can also be used in both dynamic and static modes.

C. V. (Constant Voltage Operation Mode)

In constant voltage mode, the load unit maintains a constant voltage while drawing current. In constant voltage mode, a single channel load can set two values, A&B, and limit the current value. It can also switch and select the testing conditions of A or B through the A/B keys on the front panel of the load module. The dual channel load can only set one condition value (A value), and the response time can be set in CV mode.

C. V.+C.C. (Constant Voltage+Constant Current Mode)

In constant voltage mode, a current limit can be set to enter CV+CC mode. When the voltage input is greater than the A value and the input current is lower than the limit voltage, the channel operates in CV mode. When the current is greater than the limit, the channel will enter CC mode.

C. R. (Constant Resistance Mode)

In constant resistance mode, the load cell absorbs a linearly proportional current and voltage to match the set resistance value. Single channel. There are two values for a single channel, two gears, and the up and down conversion rates. Like CC mode, constant resistance supports both dynamic and static loads, and like other loads, CR mode supports GO/NG functionality.

C. PARALLEL DYNAMIC LOADING

Each channel of the PEL-2000A controller can be used in parallel and can operate in both dynamic and static modes. In dynamic mode, the load can be set to two levels, and the minimum delay between the two levels can be set to 0.025ms. When the channels are used in parallel, dynamic testing must be synchronized. Through parallel connection, dynamic high-power loads can be effectively executed without the need for high-power load machines.

D. FRAME LINK

The PEL-2000A series can connect multiple electronic loads through a load control interface, all of which are standard MIL20 pin interfaces. It can connect up to 4 auxiliary control frames and the first main frame in parallel.

E. RUN PROGRAM

In programming sequence mode, there are a total of 12 programming sequences, with 10 sequences in each program group. By editing parameters, repeated testing can be performed. After running, all test results, including GO/NG judgment results, will be displayed on the window.

F. PROTECTION MODES

The PEL-2000A series includes multiple protection modes: Overcurrent Protection (OCP), Overvoltage Protection (OVP), Overpower Protection (OPP), Reverse Polarity Protection (RVP), and Low Voltage Protection (UVP). Each protection mode can effectively protect the load and the test object. When the protection setting is triggered, the buzzer will sound an alarm, and the load will issue an alarm to stop the load from sucking in voltage and current. When the load is used in CV and CR modes, overcurrent protection must be set to limit the load's absorption current. It is recommended to set current limit to prevent the load from burning out. Overvoltage protection is used to limit the suction voltage of the load. When the limit voltage is set, the load will effectively limit the suction voltage to protect the load. Reverse polarity protection can effectively prevent instrument damage caused by reverse connection. By setting a low voltage range, it can effectively prevent damage to the test object caused by low voltage.

G. Von VOLTAGE SETTINGS

Von Voltage refers to the voltage at which the load begins to draw current. Von Voltage has two operating modes: Von Latched on and Von Latched off. When Von Latched is turned on, the load begins to draw current when the voltage reaches Von voltage, and continues to draw current even when the voltage is lower than Von voltage. Von Latched is turned off. When the voltage reaches the Von voltage, current is drawn in, but when the voltage is lower than the Von voltage, current is stopped. As shown in the figure: When Von Latched is set to off, if the Von Voltage limit has been exceeded, the load module will start to draw current until the output voltage drops below the Von Voltage limit, and then stop drawing current.

H. EXTERNAL CHANNEL CONTROL

Through the 6-pin slot corresponding to the channel on the rear panel, the input status of each channel can be monitored, including input voltage, input current, load On/Off, and CC and CV mode settings. Voltage monitoring output (VMON) and current monitoring output (IMON), the output load input voltage and load input current are the percentage of their full scale, such as 0V=0% full scale input voltage, 10V=100% full scale input voltage. Voltage monitoring through 1&3 and current monitoring through 1&2. The following describes the pin configuration for voltage and current monitoring outputs.

In order to start the load, the load on (pin5) and GND (pin1) terminals need to pass through a low voltage (0~1V). Similarly, if a higher voltage (4-5V) is required; The load on input voltage must be TTL.