1. Introduction
The KORAD KA3005DS is a high-precision, single-channel linear DC regulated power supply designed for laboratory, college, and production environments. It offers continuously adjustable voltage and current with low ripple and noise, high reliability, and accuracy. This manual provides detailed instructions for the safe and efficient operation of your KA3005DS power supply.
2. Safety Instructions
Please read and understand all safety instructions before operating the device. Failure to do so may result in injury or damage to the equipment.
- Always connect the power supply to a grounded AC outlet.
- Do not operate the device in wet or damp conditions.
- Ensure adequate ventilation around the unit. The cooling fan must not be obstructed.
- Do not open the casing; there are no user-serviceable parts inside except for the fuse. Refer servicing to qualified personnel.
- Before replacing the fuse, ensure the power supply is disconnected from the main power source. Use only the specified fuse type (AC250V, F3A).
- Avoid touching output terminals when the unit is powered on.
- Always set voltage and current limits appropriately for the circuit being powered to prevent damage.
3. Package Contents
Upon unpacking, please verify that all items listed below are present and in good condition:
- 1 x KORAD KA3005DS DC Power Supply
- 1 x Test Leads (Red and Black)
- 1 x Power Cord
- 1 x User Manual (This document)
Figure 3.1: KORAD KA3005DS DC Power Supply and accessories.
4. Setup
4.1 Placement
Place the power supply on a stable, level surface. Ensure there is sufficient space (at least 10 cm) around the unit for proper air circulation, especially around the rear cooling fan and side vents.
Figure 4.1: Side view illustrating ventilation grilles.
4.2 Power Connection
- Ensure the power switch on the front panel is in the 'OFF' position.
- Connect the provided power cord to the AC input socket on the rear panel of the power supply.
- Plug the other end of the power cord into a grounded AC 230V, 50Hz power outlet.
Figure 4.2: Rear panel with AC power input and fuse rating (AC230V 50Hz, Fuse: AC250V, F3A).
4.3 Connecting Test Leads
Connect the test leads to the output terminals on the front panel:
- Connect the red test lead to the positive (+) output terminal.
- Connect the black test lead to the negative (-) output terminal.
- The green terminal is for ground (GND) connection, typically used for chassis ground or safety ground.
Figure 4.3: Front panel with test leads connected.
5. Operating Instructions
5.1 Front Panel Overview
Figure 5.1: Front panel controls and display.
- Display: Shows Voltage (V), Current (A), and Power (W) readings. Indicators for CV (Constant Voltage) and CC (Constant Current) modes are also present.
- Memory Save/Recall (M1-M5): Buttons to save and recall up to 5 sets of voltage and current settings.
- ADJUST Knob: Used for adjusting voltage and current values. It features both coarse and fine adjustment capabilities.
- VOLTAGE/CURRENT Buttons: Selects whether the ADJUST knob controls voltage or current.
- Output ON/OFF: Toggles the power output to the terminals.
- OCP (Over-Current Protection): Sets the over-current protection limit.
- OVP (Over-Voltage Protection): Sets the over-voltage protection limit.
- LOCK: Locks the keyboard to prevent accidental changes to settings.
- BEEP: Toggles the audible alert for certain operations or errors.
- Output Terminals: Red (+) for positive, Black (-) for negative, Green (GND) for ground.
- POWER Button: Main power switch for the unit.
5.2 Basic Operation
- Power On: Press the POWER button on the front panel. The display will light up.
- Setting Voltage:
- Press the 'VOLTAGE' button. The voltage display will blink.
- Turn the ADJUST knob to set the desired voltage. The knob supports both coarse and fine adjustments.
- Press the 'VOLTAGE' button again to confirm the setting or wait a few seconds for it to auto-confirm.
- Setting Current:
- Press the 'CURRENT' button. The current display will blink.
- Turn the ADJUST knob to set the desired current limit.
- Press the 'CURRENT' button again to confirm the setting or wait a few seconds for it to auto-confirm.
- Enabling Output: After setting voltage and current, press the 'ON/OFF' button to enable the output. The 'ON' indicator will light up.
- Disabling Output: Press the 'ON/OFF' button again to disable the output. The 'ON' indicator will turn off.
5.3 Advanced Features
- Memory Functions (M1-M5): To save current settings, press and hold one of the M1-M5 buttons until a beep is heard. To recall saved settings, simply press the desired M1-M5 button.
- Keyboard Lock: Press the 'LOCK' button to prevent accidental changes to settings. Press it again to unlock.
- Over-Voltage Protection (OVP): Press the 'OVP SET' button, then use the ADJUST knob to set the maximum allowable output voltage. This protects connected devices from excessive voltage.
- Over-Current Protection (OCP): Press the 'OCP SET' button, then use the ADJUST knob to set the maximum allowable output current. This protects connected devices from excessive current.
- Reverse Polarity Protection: The unit includes built-in protection against accidental reverse polarity connections at the output terminals.
- Short Circuit Protection: The unit is protected against short circuits at the output terminals.
6. Maintenance
6.1 Cleaning
Wipe the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the unit is powered off and disconnected from the AC supply before cleaning.
6.2 Ventilation
Regularly check that the cooling fan and ventilation grilles are free from dust and obstructions. The cooling fan operates based on the internal temperature of the radiator, ensuring efficient heat dissipation.
6.3 Fuse Replacement
If the unit fails to power on, the fuse may need replacement. The fuse holder is located on the rear panel.
- Disconnect the power cord from the AC outlet.
- Locate the fuse holder on the rear panel (refer to Figure 4.2).
- Carefully remove the fuse holder.
- Replace the blown fuse with a new one of the exact same rating: AC250V, F3A.
- Reinsert the fuse holder and reconnect the power cord.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not power on | No AC power; Blown fuse; Power switch off | Check AC connection; Replace fuse (AC250V, F3A); Ensure power switch is ON |
| No output voltage/current | Output OFF; OVP/OCP triggered; Short circuit at output | Press 'ON/OFF' button; Check OVP/OCP settings and connected load; Remove short circuit |
| Output voltage/current is unstable | Poor connection; Overload condition | Check test lead connections; Reduce load or increase current limit |
| Display shows 'OCP' or 'OVP' | Over-current or over-voltage condition detected | Reduce load current/voltage or adjust OCP/OVP limits to appropriate values |
| Unit gets excessively hot | Blocked ventilation; Prolonged high load operation | Ensure clear airflow around unit; Reduce load or allow unit to cool down |
8. Specifications
| Parameter | Value |
|---|---|
| Voltage Range | 0-30V |
| Current Range | 0-5A |
| Load Regulation (Voltage) | ≤0.01%+2mV |
| Load Regulation (Current) | ≤0.1%+10mA |
| Line Regulation (Voltage) | ≤0.01%+3mV |
| Line Regulation (Current) | ≤0.1%+3mA |
| Setup Resolution (Voltage) | 10mV |
| Setup Resolution (Current) | 1mA |
| Setup Accuracy (25°C ± 5°C) (Voltage) | ≤0.5%+20mV |
| Setup Accuracy (25°C ± 5°C) (Current) | ≤0.5%+10mA |
| Ripple (20-20M) (Voltage) | ≤2mVrms |
| Ripple (20-20M) (Current) | ≤2mVrms |
| Temperature Coefficient (Voltage) | ≤150ppm |
| Temperature Coefficient (Current) | ≤150ppm |
| Read Back Resolution (Voltage) | 10mV |
| Read Back Resolution (Current) | 1mA |
| Read Back Temp. Coefficient (Voltage) | ≤150ppm |
| Read Back Temp. Coefficient (Current) | ≤150ppm |
| Reaction Time (Voltage Rise) | ≤100mS |
| Reaction Time (Voltage Drop) | ≤100mS |
| Interface | Non-Programmable Interface |
| Weight | 9.52 Lbs / 4.32 Kg |
| Dimensions (W x H x D) | 100mm x 156mm x 260mm |
9. User Tips
Based on common practices and user feedback for similar precision power supplies:
- Always set the voltage and current limits to the lowest safe values before connecting a new circuit, then gradually increase them as needed.
- Utilize the memory functions (M1-M5) to quickly switch between frequently used voltage and current settings for different projects.
- The OVP and OCP features are crucial for protecting sensitive circuits. Always set these limits slightly above your expected operating parameters.
- For precise measurements, ensure your test leads are in good condition and connections are secure to minimize resistance and voltage drop.
- When working with sensitive components, consider using the ground terminal to ensure a common reference potential and reduce noise.
10. Warranty & Support
For warranty information and technical support, please refer to the documentation provided at the point of purchase or contact your vendor. Keep your purchase receipt as proof of purchase.
