1. Introduction
This manual provides detailed instructions for the safe and efficient operation of the KORAD KA3005D Digital DC Power Supply. This high-precision adjustable power supply is designed for scientific research, laboratory service, and other applications requiring stable and controllable DC power.
The KA3005D features a compact design, dual 4-digit LED displays for precise readings, and digital controls for easy adjustment. It includes advanced features such as output switch control, memory storage for up to 4 parameter sets, and a keyboard lock function to prevent accidental changes. Comprehensive circuit protection mechanisms are integrated to safeguard against over-load, short-circuit, and over-temperature conditions. The unit also offers automatic switching between mA and A display and operates quietly with a variable speed fan.
2. Safety Information
WARNING:
- To avoid electric shock, the power cord protective grounding conductor must be connected to ground.
- For continued fire protection, replace fuse only with specified type and rating.
- Do not remove covers. Refer servicing to qualified personnel.
3. Product Overview
3.1. Components
The KORAD KA3005D features a clear front panel with dual LED displays for voltage (V) and current (A), along with indicator lights for Over Voltage Protection (OVP), Over Current Protection (OCP), Constant Current (C.C), Constant Voltage (C.V), and Output (OUT). It also includes memory buttons (M1-M4), Lock/Beep, OCP, OVP, and On/Off buttons, a rotary encoder for adjustment, and Voltage/Current selection buttons. Output terminals for positive (+), negative (-), and ground (GND) are located at the bottom front.
3.2. Package Contents
The package typically includes:
- KORAD KA3005D Digital DC Power Supply Unit
- Power Cable
- USB Communication Cable (for models with 'P' in model number)
- Control Software CD (for models with 'P' in model number)
- User Manual
- Test Leads (red and black with alligator clips)
4. Setup
4.1. Initial Inspection
Upon receiving your power supply, inspect the packaging for any signs of damage. Open the package and check for all included accessories against the package contents list. If any items are missing or damaged, contact your supplier immediately.
4.2. Power Connection
- Ensure the power switch on the front panel is in the OFF position.
- Connect the provided power cable to the AC input socket on the rear panel of the power supply.
- Plug the other end of the power cable into a grounded AC outlet (220V +/-10%, 50-60Hz).
4.3. Output Terminal Connection
Connect your load to the output terminals using appropriate test leads. Ensure correct polarity:
- Red terminal (+) for positive output.
- Black terminal (-) for negative output.
- Green terminal (GND) for ground connection.
CAUTION: Always ensure the power supply is OFF before connecting or disconnecting any load.
5. Operating Instructions
5.1. Powering On/Off
- Turn on the power supply by pressing the 'POWER' button on the front panel. The LED displays will light up.
- To turn off, press the 'POWER' button again.
5.2. Setting Voltage and Current
The KA3005D allows for precise adjustment of both voltage and current. Use the rotary encoder and the 'Voltage/Current' selection button.
- Press the 'Voltage/Current' button to select either voltage (V) or current (A) for adjustment. The corresponding LED indicator will illuminate.
- Rotate the 'ADJUST' knob to change the value. A short press on the knob allows you to select which digit to adjust for fine-tuning.
- The display will show the set voltage and current.
5.3. Output Control
The output can be enabled or disabled independently of the power supply being on.
- Press the 'On/Off' button (labeled 'OUT') to enable or disable the output.
- When the output is enabled, the 'OUT' indicator will light up.
5.4. Memory Functions (M1-M4)
The power supply can store and recall up to 4 sets of voltage and current parameters.
- To Save: Set the desired voltage and current. Press and hold one of the 'M1' to 'M4' buttons until a beep is heard, indicating the parameters are saved.
- To Recall: Briefly press the desired 'M1' to 'M4' button to recall the stored parameters.
5.5. Keyboard Lock
To prevent accidental changes to settings, the keyboard can be locked.
- Press the 'Lock/Beep' button to activate the keyboard lock. The 'Lock' indicator will light up.
- Press the 'Lock/Beep' button again to unlock the keyboard.
5.6. Over Voltage Protection (OVP) and Over Current Protection (OCP)
These features protect your load and the power supply from damage.
- Setting OVP: Press the 'OVP' button. Use the rotary encoder to set the maximum voltage limit. Press 'OVP' again to confirm.
- Setting OCP: Press the 'OCP' button. Use the rotary encoder to set the maximum current limit. Press 'OCP' again to confirm.
- If the output voltage or current exceeds the set OVP/OCP limits, the power supply will automatically shut down the output and illuminate the corresponding indicator.
6. Maintenance
6.1. Cleaning
Regularly clean the exterior of the power supply with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure ventilation openings are free from dust and debris.
6.2. Fuse Replacement
If the power supply does not turn on, check the fuse located on the rear panel. Replace it only with a fuse of the specified type and rating (AC250V, F3A).
WARNING: Disconnect the power cord before replacing the fuse.
6.3. Calibration
The device is factory calibrated. If recalibration is required, refer to the detailed calibration procedure in the full service manual or contact qualified service personnel. One user noted that even after calibration, a slight current reading discrepancy (0.001mA below 10V) might persist, which is likely due to ADC noise and generally acceptable for most applications.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power when turned on. | Power cord not connected, power outlet faulty, or fuse blown. | Check power cord connection. Test power outlet. Replace fuse if blown (refer to Maintenance section). |
| No output voltage/current. | Output disabled, OVP/OCP triggered, or load disconnected/faulty. | Press 'On/Off' (OUT) button to enable output. Check OVP/OCP settings and reset if triggered. Verify load connection and functionality. |
| Voltage/Current cannot be adjusted. | Keyboard locked. | Press 'Lock/Beep' button to unlock the keyboard. |
| Current reading shows 0.001mA below 10V. | ADC noise or minor calibration offset. | This is a minor discrepancy due to ADC noise and is generally acceptable. If critical, consult service manual for advanced calibration. |
8. Specifications
| Feature | Specification |
|---|---|
| Input Voltage | 220V +/-10% |
| Frequency Range | 50-60Hz |
| Operating Temperature | 0-40 °C (32-104 °F) |
| Operating Humidity | < 80%RH |
| Storage Temperature | 0-70 °C (32-158 °F) |
| Storage Humidity | < 70%RH |
| Output Voltage Range | 0-30V (Continuously adjustable) |
| Voltage Setup Resolution | 10 mV |
| Voltage Setup Accuracy | <0.05% +20 mV |
| Voltage Ripple | < 1mVRMS |
| Voltage Read back Accuracy | 10 mV |
| Voltage Temp. Coefficient | < 0.1% + 10mV |
| Voltage Read back Temp. Coefficient | < 100 ppm+10 mV |
| Output Current Range | 0-5A (Continuously adjustable) |
| Current Setup Resolution | 1 mA |
| Current Setup Accuracy | <0.1% +3 mA |
| Current Ripple | < 3mARMS |
| Current Read back Accuracy | 1 mA |
| Current Temp. Coefficient | < 0.1% + 5mA |
| Current Read back Temp. Coefficient | < 100 ppm+5 mA |
| Weight | 4.3 Kg (9.5 lbs) |
| Dimensions (W x H x D) | 110 x 156 x 260mm (4.3 x 6.1 x 10.25 inches) |
9. User Tips
- For precise current measurements, especially at lower voltages, be aware of potential minor discrepancies due to ADC noise. For most applications, the accuracy is sufficient.
- The power supply is single-polar. It is not designed for testing amplifiers that require dual-polar power.
- While the unit is a linear power supply, for critical applications requiring ripple analysis, an oscilloscope is recommended to verify actual ripple levels.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact details provided with your purchase documentation or visit the official KORAD website. Do not attempt to service the unit yourself; refer servicing to qualified personnel.