1. Introduction
This manual provides essential information for the safe and efficient operation of your Astron RS-35A-AP Desktop 13.8VDC Linear Power Supply. Please read these instructions carefully before installation and use, and retain them for future reference.
Image 1.1: Front view of the Astron RS-35A-AP Desktop 13.8VDC Linear Power Supply, showing the front panel with meters and terminals.
1.1 Safety Information
- Read all instructions: Before operating the power supply, read and understand all safety and operating instructions.
- Ventilation: Ensure adequate ventilation. Do not block ventilation openings. Overheating can cause damage.
- Power Source: Connect the unit only to a 105-125VAC, 50/60Hz power source.
- Grounding: The power supply must be properly grounded to prevent electric shock.
- Moisture: Do not expose the unit to rain or moisture. Do not operate in wet or damp conditions.
- Servicing: Refer all servicing to qualified service personnel. Do not attempt to open or repair the unit yourself.
- Overload: Do not exceed the specified current ratings. Overloading can damage the power supply and connected equipment.
2. Product Features
The Astron RS-35A-AP is a robust linear power supply designed for reliable performance. Key features include:
- Solid State Electronically Regulated: Provides stable and clean DC output.
- Fold Back Current Limiting: Protects the power supply from excessive current and continuous shorted output conditions.
- Crowbar Over Voltage Protection: Integrated on all models to safeguard connected equipment.
- Regulation and Low Ripple: Maintains regulation and low ripple even at low line input voltages.
- Heavy Duty Heat Sink: Designed for efficient heat dissipation without the need for a cooling fan.
- Power Terminals: Equipped with 1/4"-20 screw type terminals and Anderson Power Poles for versatile connectivity.
- Continuous Duty: Provides 25 Amps continuous output.
- Intermittent Communication Service (ICS): Capable of 35 Amps peak output.
3. Setup
3.1 Placement
- Place the power supply on a stable, level surface.
- Ensure there is ample space around the unit for proper air circulation, especially around the heat sink. Do not place the unit in an enclosed cabinet without adequate ventilation.
- Avoid placing the unit near heat sources or in direct sunlight.
3.2 Connecting AC Power
- Ensure the power supply's ON/OFF switch is in the OFF position.
- Connect the supplied three-conductor power cord to the AC input receptacle on the rear of the power supply.
- Plug the other end of the power cord into a standard 105-125VAC, 50/60Hz grounded wall outlet.
3.3 Connecting DC Loads
The RS-35A-AP offers two types of DC output terminals:
- 1/4"-20 Screw Type Terminals: For high-current applications, connect your load's positive (+) wire to the red terminal and the negative (-) wire to the black terminal. Ensure connections are tight and secure.
- Anderson Power Poles: For quick and convenient connections, use compatible Anderson Power Pole connectors. Ensure correct polarity when connecting.
Always ensure that the total current draw of your connected equipment does not exceed the continuous duty rating of 25 Amps.
4. Operating Instructions
4.1 Powering On/Off
- After connecting your DC load(s) and AC power, switch the ON/OFF toggle switch on the front panel to the ON position.
- The power supply will provide a stable 13.8VDC output.
- To power off, switch the toggle switch to the OFF position. It is recommended to disconnect loads before powering off for sensitive equipment.
4.2 Output Voltage Adjustment (Internal)
The output voltage of the RS-35A-AP is internally adjustable from 11VDC to 15VDC. This adjustment is intended for advanced users and requires opening the unit. Warning: Opening the unit voids the warranty and exposes you to hazardous voltages. This adjustment should only be performed by qualified personnel.
- If adjustment is necessary, consult the full service manual or a qualified technician.
- Always ensure the unit is disconnected from AC power before attempting any internal adjustments.
4.3 Overload Protection
The power supply features fold-back current limiting and crowbar over-voltage protection. If an overload or short circuit occurs, the output voltage will drop to protect the unit and connected equipment. Reduce the load or clear the short circuit, then cycle the power (OFF then ON) to reset the protection circuit.
5. Maintenance
5.1 Cleaning
- Ensure the power supply is disconnected from all power sources before cleaning.
- Wipe the exterior surfaces with a soft, dry cloth.
- Do not use abrasive cleaners, solvents, or harsh chemicals.
- Keep ventilation openings clear of dust and debris. Use a soft brush or compressed air if necessary.
5.2 General Inspection
- Periodically inspect the power cord for any signs of damage (fraying, cuts). Replace if damaged.
- Check all terminal connections for tightness and ensure they are free from corrosion.
5.3 User Serviceable Parts
There are no user-serviceable parts inside the Astron RS-35A-AP power supply. Attempting to open or repair the unit will void the warranty and may expose you to dangerous electrical components. Refer all servicing to qualified service personnel.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power indicator, no output. | Unit not plugged in; AC outlet faulty; Power switch OFF; Internal fuse blown. | Check AC power cord connection; Test AC outlet; Ensure power switch is ON; Contact qualified service personnel for fuse replacement. |
| Output voltage drops significantly or no output under load. | Overload condition; Short circuit in load; Faulty load. | Reduce load current; Check load for short circuits; Disconnect load and test power supply output (no load). Cycle power to reset protection. |
| Unit becomes excessively hot. | Inadequate ventilation; Continuous operation at maximum load; Internal fault. | Ensure proper airflow around the unit; Reduce load or operating time; Discontinue use and contact service personnel if problem persists. |
If troubleshooting steps do not resolve the issue, please contact Astron customer support or a qualified service technician.
7. Specifications
| Parameter | Value |
|---|---|
| Model Number | RS-35A-AP |
| Input Voltage | 105-125VAC |
| Output Voltage | 13.8VDC ±0.05 volts (Internally adjustable 11-15VDC) |
| Continuous Duty Current | 25 Amps |
| ICS (Intermittent Communication Service) Current | 35 Amps |
| Ripple | Less than 5mV Peak to Peak (full load and low line) |
| Load Regulation | 0.08% from 0 to Full Continuous Load |
| Efficiency | 77% |
| Operating Temperature | -10 to 55°C |
| Power Terminals | 1/4"-20 Screw Type and Anderson Power Poles |
| Cooling | Heavy Duty Heat Sink (Fan Cooled: No) |
| Item Weight | 25.2 pounds (11.43 kg) |
| Product Dimensions | 11 x 11 x 5 inches (27.94 x 27.94 x 12.7 cm) |
| Color | Black |
8. Warranty and Support
8.1 Warranty Information
Astron products are manufactured to high-quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Astron website. Keep your proof of purchase for warranty claims.
8.2 Customer Support
If you have any questions, require technical assistance, or need to arrange for service, please contact Astron customer support. Contact information can typically be found on the manufacturer's website or in the product packaging.
