1. Introduction
The ENGINDOT MDC01 is a high-precision, adjustable DC bench power supply designed for various applications including school lab experiments, cell phone repair, electronics production, and general lab measurements. It features a 4-digit LED display for accurate voltage and current readings, along with digital control technology for precise adjustments.
This manual provides essential information for the safe and effective operation of your MDC01 DC Power Supply. Please read it thoroughly before use and retain it for future reference.
Figure 1: ENGINDOT MDC01 DC Power Supply with included accessories.
Figure 2: The MDC01 power supply in a typical application setting.
2. Safety Instructions
To ensure safe operation and prolong the life of your device, observe the following safety precautions:
- Always connect the power supply to a properly grounded electrical outlet.
- Do not operate the device in wet or damp conditions.
- Ensure adequate ventilation around the unit. Do not block the cooling fan or vents.
- Avoid exposing the unit to direct sunlight or high temperatures.
- Do not open the casing. There are no user-serviceable parts inside. Refer all servicing to qualified personnel.
- Before connecting or disconnecting loads, ensure the output is turned off using the output button.
- The unit incorporates multiple protection features including thermal protection, voltage overload protection, and short-circuit protection. If a protection circuit activates, disconnect the load and identify the cause before resuming operation.
3. Product Overview
Familiarize yourself with the components of your ENGINDOT MDC01 DC Power Supply.
Figure 3: Front and Rear Panel Components.
Front Panel Components:
- Output Voltage Display: Shows the current output voltage in Volts (V).
- Output Current Display: Shows the current output current in Amperes (A).
- CV Indicator: Illuminates when the power supply is operating in Constant Voltage mode.
- CC Indicator: Illuminates when the power supply is operating in Constant Current mode.
- Voltage Adjusting Knob: Used to set the output voltage. Press to switch between coarse and fine adjustment.
- Current Adjusting Knob: Used to set the output current limit. Press to switch between coarse and fine adjustment.
- Output Button: Toggles the power output ON/OFF.
- Output Negative Terminal (-): Connects to the negative side of the load.
- Ground Terminal (GND): Connects to the chassis ground.
- Output Positive Terminal (+): Connects to the positive side of the load.
Rear Panel Components:
- Power Switch: Main power ON/OFF switch for the unit.
- Cooling Fan: Provides active cooling for internal components.
- AC Power Input: Connects the power supply to the AC mains.
- Fuse Box: Contains the protective fuse for the unit.
Figure 4: Internal components and cooling system.
4. Setup
- Unpacking: Carefully remove the power supply and all accessories from the packaging. Inspect for any signs of damage.
- Placement: Place the unit on a stable, level surface with adequate space for ventilation, especially around the rear cooling fan.
- Power Connection: Connect the provided AC power cord to the AC Power Input on the rear panel and then to a grounded 110V AC power outlet.
- Initial Power On: Flip the main Power Switch on the rear panel to the 'ON' position. The LED display should illuminate.
- Output Connection: Before connecting any load, ensure the front panel 'Output' button is in the OFF state (indicator light off). Connect your load to the output terminals using appropriate cables (e.g., the provided alligator clips). Connect the positive (+) terminal of the power supply to the positive side of your load, and the negative (-) terminal to the negative side. The ground (GND) terminal can be connected to the chassis ground of your circuit if required.
5. Operating Instructions
5.1. Setting Voltage and Current
The MDC01 features digital control technology for precise adjustment of voltage and current.
- Coarse and Fine Adjustment: The Voltage and Current adjusting knobs allow for both coarse and fine adjustments. Press the respective knob once to toggle between coarse (adjusting whole numbers) and fine (adjusting decimal places) adjustment modes. Rotate the knob to change the value.
- Setting Voltage: Rotate the Voltage adjusting knob to set the desired output voltage. The 4-digit LED display will show the set value.
- Setting Current Limit: Rotate the Current adjusting knob to set the maximum output current (current limit). This protects your load from excessive current. The 4-digit LED display will show the set value.
Figure 5: Precision encoder knob for detailed adjustments.
5.2. Constant Voltage (CV) and Constant Current (CC) Mode
The power supply automatically switches between Constant Voltage (CV) and Constant Current (CC) modes depending on the load and the set current limit.
- Constant Voltage (CV): When the load resistance is high, the output current is below the set current limit. The power supply maintains the set output voltage, and the CV indicator will be illuminated.
- Constant Current (CC): When the load resistance is low, causing the current to reach the set current limit, the power supply automatically switches to CC mode. It will then maintain the set current, and the output voltage will drop. The CC indicator will be illuminated. This protects the load from overcurrent.
5.3. Data Hold Function
The MDC01 includes a data hold function to temporarily store a set of voltage and current values.
- To activate Data Hold: Press both the Voltage and Current adjusting knobs simultaneously for 3 seconds. The display will indicate that the values are held.
- To release Data Hold: Press both knobs simultaneously again for 3 seconds.
5.4. Output Control
Use the 'Output' button on the front panel to enable or disable the power output to your load. This allows you to set voltage and current parameters without immediately applying power to your circuit.
Figure 6: Demonstrating high precision output with an external multimeter.
6. Maintenance
Proper maintenance ensures the longevity and reliable operation of your power supply.
- Cleaning: Disconnect the power supply from the mains before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use abrasive cleaners or solvents.
- Ventilation: Regularly check that the cooling fan and ventilation openings are free from dust and obstructions. A built-in fan reduces operational noise and prolongs product life.
- Fuse Replacement: If the unit fails to power on, the fuse may need replacement. The fuse box is located on the rear panel. Disconnect the power cord, open the fuse box, and replace the fuse with one of the same type and rating (5A, 110V AC).
Figure 7: Efficient air cooling system for optimal performance.
7. Troubleshooting
If you encounter issues with your power supply, refer to the following common problems and solutions:
- No Power:
- Check if the rear power switch is ON.
- Verify the AC power cord is securely connected to both the unit and the wall outlet.
- Check the fuse in the rear fuse box and replace if blown (refer to Maintenance section).
- No Output Voltage/Current:
- Ensure the front panel 'Output' button is pressed (indicator light ON).
- Verify that the voltage and current limit settings are not set to zero.
- Check for short circuits in your load. The power supply may be in CC mode with very low voltage output if a short is present.
- Ensure the load is correctly connected to the output terminals.
- Inaccurate Readings:
- Compare readings with a calibrated multimeter. Small discrepancies may occur due to display resolution.
- Ensure proper connection of test leads to the load and power supply.
- Overheating:
- Ensure the cooling fan and vents are not obstructed.
- Reduce the load or operating time if the unit frequently triggers thermal protection.
8. Specifications
| Parameter | Value |
|---|---|
| Input Voltage/Output Voltage | 104~127V AC (60Hz) |
| Current Output Range | 0A ~ 5A DC |
| Voltage Output Range | 0V ~ 30V DC |
| Power Output Range | 0W ~ 150W |
| Maximum Output Current | 5A DC |
| Maximum Working Power | 150W |
| Product Display Accuracy | Voltage: LED ±0.5% + 5; Current: LED ±0.5% + 5 |
| Working Temperature | 0 °C - 40 °C |
| Product Weight | 3 lb |
| Fuse | 5A (AC 110V Input) |
| Item Model Number | MDC01 |
| Package Dimensions | 11.34 x 8.03 x 5.59 inches |
Figure 8: Physical dimensions of the MDC01 unit.
9. Warranty and Support
ENGINDOT products are designed for reliability and performance. For warranty information or technical support, please refer to the contact details provided with your purchase documentation or visit the official ENGINDOT website. Please have your model number (MDC01) and purchase date available when contacting support.
For additional resources, you may visit the ENGINDOT Brand Store.
