MDL150 CNC Electronic Load Tester User Manual

1. Introduction

The Gaqqee MDL150 CNC Electronic Load Tester is a versatile instrument designed for testing DC power supplies, batteries, and other electronic components. Featuring a 2.4-inch color screen, it provides clear and intuitive data display. This device supports constant current (CC), constant power (CP), and constant resistance (CR) operating modes, along with comprehensive safety protections including over-voltage, over-current, over-power, and over-temperature. It is equipped with an NTC sensor for accurate temperature monitoring and offers a bilingual interface for ease of use.

2. Product Overview and Dimensions

The MDL150 is a compact and robust electronic load tester. Understanding its physical layout and dimensions is crucial for proper placement and connection.

3. Setup and Connections

Before operating the device, ensure proper power supply and load connections.

3.1 Power Supply

• Connect the included DC12V 1A American Standard Power Adapter to the DC5.5 * 2.5 power supply terminal (8) on the rear of the unit.
• Ensure the power adapter is securely connected to a suitable power outlet.

3.2 Load Connections

The device supports a 4-wire system and is downward compatible with a 2-wire system. Use the 6P test access terminal (6) for connecting your load.

• NTC: Connect an external NTC 3950 10K 1% temperature sensor here for external temperature measurement.
• A+ V+ V- A-: These terminals are for connecting the load. A+ and A- are for current sensing, while V+ and V- are for voltage sensing. For 2-wire systems, connect A+ to V+ and A- to V-.

4. Operating Instructions

This section details how to operate your MDL150 Electronic Load Tester, including interface navigation, mode selection, and setting parameters.

4.1 Controls and Interface

The device features a 2.4-inch display screen (7) and several control elements:

• Encoder (1): Used for navigating menus and adjusting values.
• Menu buttons (2): Accesses the main menu.
• Run/Stop button (3): Starts or stops the discharge program.
• Switch (4): Power ON/OFF switch.
• Work indicator light (5): Indicates operational status.

4.2 Main Menu Options

Press the 'MEUN' button (2) to access the main menu. Use the Encoder (1) to navigate and select options.

1. Chinese English: System language switching.
2. Clear cumulative: Accumulated data reset.
3. Current & Voltage clear zero (No load): Zero load voltage and current clearing.
4. Voltage Ref 30V: Voltage calibration reference (30V).
5. Current Ref 3A: Current calibration reference (3A).
6. Display Brightness: Adjust screen brightness (1-9).
7. Standby time: Set screen hibernation/standby time.
8. Reset: Restore factory settings.
9. Exit: Exit the menu.

4.3 Display Information

The 2.4-inch color screen displays various real-time and accumulated data:

• Accumulated running time (1): ddd:hh:mm:ss (days:hours:minutes:seconds).
• Internal temperature (2): Temperature near the core discharge area, controlled by the fan.
• External temperature (3): External NTC sensor monitors temperature.
• Discharge parameter settings (4): Set current (CC mode), power (CP mode), or resistance (CR mode).

• Voltage (5): Real-time voltage (Vol).
• Current (6): Real-time current (Cur).
• Power (7): Real-time power (Pwr).
• Accumulated test power (8): Energy (Ene) in Wh (1 kWh = 1000 Wh).
• Accumulated testing capacity (9): Capacity (Cap) in Ah.
• Load impedance (10): Resistance (Res) in Ω.

4.4 Operating Modes and Protection Settings

The MDL150 offers three primary operating modes and various protection features to ensure safe testing.

• Working Modes (16):
  • CC: Constant Current mode.
  • CP: Constant Power mode.
  • CR: Constant Resistance mode.
• Over-protection settings:
  • OPP (13): Overpower protection (max. 150W adjustable).
  • OCP (14): Overcurrent protection (max. 20A adjustable).
  • OVP (15): Overvoltage protection (max. 150V adjustable).
  • OTP: Over-temperature protection (triggers when internal temperature > 75℃).
• Limited-voltage discharge (Low-voltage protection) (12): Set a stop discharge voltage. Default is unlimited, but can be configured.
• Time-limited discharge (11): Set a maximum discharge time (up to 99 hours, 59 minutes). Display shows '--:--' for unlimited, or '00:03' for 3 minutes.

5. Maintenance

To ensure the longevity and accurate performance of your MDL150 Electronic Load Tester, follow these maintenance guidelines:

• Cooling Fan: The device includes a cooling fan (9) that operates automatically when the internal temperature reaches ≥40℃ or the current exceeds 3A. Ensure the fan vents are not obstructed to allow for proper airflow.
• Cleaning: Keep the device clean and free from dust. Use a soft, dry cloth for cleaning. Avoid using abrasive cleaners or solvents that could damage the casing or screen.
• Storage: Store the device in a dry, cool environment away from direct sunlight and extreme temperatures.

6. Troubleshooting

This section provides guidance on common issues and error indicators you might encounter.

6.1 Status Indicators (17)

The device displays various status messages to indicate its current state or any triggered protections:

• STOP: Program not running.
• DSG: Currently executing discharge program.
• END: Program execution completed.
• OPP: Power over limit protection, triggering power greater than OPP.
• OCP: Current over limit protection, triggering current greater than OCP.
• OVP: Voltage over limit protection, triggering voltage greater than OVP.
• OTP: Overheat protection, triggering internal temperature > 75℃.

6.2 General Troubleshooting Tips

• Device not powering on: Check the DC12V 1A power adapter connection and ensure the power switch (4) is ON.
• No readings/Incorrect readings: Verify that the load is correctly connected to the 6P test access terminal (6) and that the wiring mode is appropriate (4-wire or 2-wire). Ensure no-load voltage and current are cleared if necessary (Menu option 3).
• Protection triggered: If OPP, OCP, OVP, or OTP is displayed, check your load parameters against the set protection limits. Reduce the load or adjust protection settings if appropriate. Allow the device to cool down if OTP is active.
• Interface issues: If the display is unclear or unresponsive, try adjusting the screen brightness (Menu option 6). If issues persist, consider restoring factory settings (Menu option 8).

7. Specifications

Detailed technical specifications for the MDL150 CNC Electronic Load Tester:

8. User Tips

• High Voltage/Capacity Testing: The device supports up to 150V and 20A. When testing high voltage or high capacity batteries (e.g., 72V, 70Ah), ensure that the current drawn does not exceed 20A and the total power (Voltage x Current) does not exceed 150W to prevent triggering protection mechanisms.
• Calibration: For precise measurements, utilize the voltage and current calibration options in the main menu (Menu options 4 and 5) with known reference sources.
• Temperature Monitoring: For critical tests, consider connecting an external NTC sensor to the NTC terminal for more accurate and localized temperature monitoring, especially during prolonged high-power discharges.

9. Warranty and Support

For any technical assistance, warranty claims, or support inquiries regarding your MDL150 CNC Electronic Load Tester, please contact the seller or manufacturer directly. Keep your purchase records handy when seeking support.