KKnoon 150W 20A Adjustable Constant Current Electronic Load User Manual

1. Product Overview

The KKnoon 150W 20A Adjustable Constant Current Electronic Load is a versatile direct current (DC) electronic load device designed for testing power supplies, batteries, and other DC sources. It features a 2.4-inch TFT color display for real-time monitoring of various parameters and supports four distinct working modes. This manual provides detailed instructions for its setup, operation, and maintenance.

Figure 1: KKnoon 150W 20A Electronic Load with included accessories.

2. Safety Information

• Ensure the device is powered by a 12VDC, 1A power adapter.
• Do not exceed the maximum load voltage of 150VDC, load current of 20A, or load power of 150W (max. 60W above 120V).
• Always connect the load correctly using the four-wire system for accurate measurements.
• Avoid touching internal components when the device is powered on.
• Operate in a well-ventilated area to prevent overheating.

3. Package Contents

Verify that all items are present in the package:

• 1 x Electronic Load Unit
• 1 x 12VDC Power Adapter
• 1 x NTC Temperature Sensor

4. Device Layout and Connections

Familiarize yourself with the main components and connection points of the electronic load.

Figure 2: Key components of the Electronic Load.

1. Operating Power Supply DC Interface: Connect the provided 12VDC, 1A power adapter here.
2. Cooling Fan: Automatically activates when internal temperature reaches ≥40°C or current exceeds 3A.
3. Control Keys: Used for navigation, setting parameters, and turning the load ON/OFF.
4. 2.4-inch Display: TFT color screen showing all operational parameters and settings.
5. Input 4P Terminal Block: For connecting the device under test (DUT). Supports four-wire (A+, V+, V-, A-) and two-wire systems.

Figure 3: Detailed view of the four-wire terminal block and NTC sensor interface.

5. Setup and Wiring

Proper wiring is crucial for accurate measurements and safe operation.

5.1 Powering the Device

• Connect the provided 12VDC, 1A power adapter to the DC input jack (1) on the electronic load.
• Plug the adapter into a suitable power outlet. The display should illuminate.

5.2 Connecting the Load (Device Under Test)

The electronic load supports both four-wire and two-wire connection methods. The four-wire method provides more accurate voltage measurement by separating the voltage sensing lines from the current carrying lines.

Figure 4: Wiring diagrams for four-wire and two-wire connections.

• Four-Wire System: Connect the positive terminal of the DUT to A+ and the negative terminal to A- for current flow. Additionally, connect a separate pair of wires from the positive terminal of the DUT to V+ and the negative terminal to V- for voltage sensing. This method compensates for voltage drop across the current wires.
• Two-Wire System (Downward Compatible): Connect the positive terminal of the DUT to A+ and the negative terminal to A-. In this configuration, the V+ and V- terminals are internally shorted to A+ and A- respectively. Note that voltage readings may be slightly less accurate due to voltage drop in the current wires.

5.3 Connecting the NTC Temperature Sensor

• Plug the NTC 3950 10K 1% temperature sensor into the dedicated NTC interface next to the 4P terminal block (refer to Figure 3).
• Place the sensor in contact with the component or area whose temperature you wish to monitor (e.g., battery surface). The device will display temperatures from 0-100°C.

6. Operating Instructions

The electronic load features a 2.4-inch TFT color display and control buttons for easy operation.

Figure 5: Control buttons for operation.

6.1 Display Overview

The 2.4-inch TFT color screen displays real-time values for:

• Voltage (V)
• Current (A)
• Power (W)
• Cumulative Energy (Wh)
• Cumulative Capacity (Ah)
• Internal Resistance (Ω)
• Load Status (ON/OFF)
• Operating Mode (CC, CV, CP, CR)
• Protection Status (OVP, OCP, OPP)
• Stop Voltage
• Time Limit Discharge
• External Temperature (if NTC sensor connected)

6.2 Control Buttons

• ON/OFF: Toggles the electronic load ON or OFF.
• '-' (Minus): Decreases parameter values or navigates menu options.
• '+' (Plus): Increases parameter values or navigates menu options.
• SET: Enters parameter setting mode, confirms selections, or switches between display pages.

6.3 Working Modes

The device supports four primary working modes:

1. CC (Constant Current) Mode: Maintains a constant discharge current regardless of voltage changes. Ideal for battery capacity testing.
2. CV (Constant Voltage) Mode: Maintains a constant voltage across the load.
3. CP (Constant Power) Mode: Maintains a constant power dissipation.
4. CR (Constant Resistance) Mode: Maintains a constant resistance.

To select a working mode:

1. Press the SET button to enter the main menu or parameter setting interface.
2. Use the '+' or '-' buttons to navigate to the 'Mode' option.
3. Press SET to select, then use '+' or '-' to choose the desired mode (CC, CV, CP, CR).
4. Press SET again to confirm the mode selection.

6.4 Setting Parameters

After selecting a working mode, you can set its specific parameters (e.g., target current for CC mode, target voltage for CV mode).

1. In the desired working mode, press SET to highlight the parameter you wish to adjust.
2. Use '+' or '-' to change the value. A long press may accelerate value changes.
3. Press SET again to confirm the value and move to the next parameter or exit setting mode.

6.5 Protection Settings

The device includes several protection features to prevent damage to the DUT or the electronic load itself.

• Overvoltage Protection (OVP): Supports up to 150V. Set the maximum allowable input voltage.
• Overcurrent Protection (OCP): Supports up to 20A. Set the maximum allowable current draw.
• Over-power Protection (OPP): Supports up to 150W. Set the maximum allowable power dissipation.
• Limited Voltage Discharge (Low Voltage Protection): Allows setting a minimum discharge voltage. If the DUT voltage drops below this threshold, the load will stop. Default is unlimited; set according to your needs.
• Time Limit Discharge: Supports discharge duration up to 99 hours and 59 minutes. The load will stop automatically after the set time.

To set protection parameters, navigate through the menu using the SET, '+', and '-' buttons.

6.6 Other Settings

• Chinese and English Interface Switching: Supported. Navigate to the language setting in the menu.
• Zeroing of Total Data: Resets cumulative energy (Wh) and capacity (Ah) measurements.
• Voltage and Current No-Load Nulling: Calibrates the zero point for voltage and current readings when no load is connected.
• Voltage Open Calibration: Allows for fine-tuning voltage measurement accuracy.
• Current Open Calibration: Allows for fine-tuning current measurement accuracy.
• Screen Brightness Adjustment: Adjust display brightness for optimal visibility.
• Screen Hibernation Standby Setting: Configures display standby behavior.
• Restore Factory Settings: Resets all parameters to their default values.

7. Maintenance

• Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
• Ensure proper ventilation around the device, especially the cooling fan, to prevent overheating.
• Store the device in a dry environment, away from direct sunlight and extreme temperatures.
• Do not attempt to disassemble the device beyond what is necessary for sensor connection or cleaning, as this may void the warranty.

8. Troubleshooting

• Device does not power on: Check if the 12VDC power adapter is correctly connected and functioning. Ensure the power outlet is active.
• No load current/voltage reading: Verify that the DUT is properly connected to the 4P terminal block (A+, A-, V+, V-). Ensure the DUT is powered on and supplying voltage. Check if the load is enabled (ON/OFF button).
• Load stops unexpectedly: Check if any protection (OVP, OCP, OPP, Low Voltage Protection, Time Limit Discharge) has been triggered. Adjust protection limits if necessary.
• Inaccurate readings: Perform voltage and current open calibration. Ensure a four-wire connection is used for maximum accuracy.
• Cooling fan not running: The fan activates automatically when the internal temperature reaches ≥40°C or current exceeds 3A. If these conditions are met and the fan is still not running, contact support.

9. Specifications

10. Warranty and Support

For warranty information and technical support, please refer to the retailer where the product was purchased or visit the official KKnoon website. Keep your purchase receipt as proof of purchase.