1. Introduction
This manual provides essential information for the safe and efficient operation of your Astron RS-70M-AP Desktop 13.8VDC Linear Power Supply. The RS-70M-AP is a robust, solid-state electronically regulated linear power supply designed to deliver stable 13.8VDC output with minimal electrical noise, making it ideal for sensitive electronic equipment such as ham radio transceivers. Please read this manual thoroughly before installation and operation.
2. Safety Information
- Electrical Shock Hazard: This unit operates with high voltage. Do not open the casing. Refer all servicing to qualified personnel.
- Ventilation: Ensure adequate airflow around the unit. Do not block ventilation openings. Overheating can damage the power supply.
- Environment: Operate the power supply in a dry, well-ventilated area, away from moisture, direct sunlight, and extreme temperatures.
- Grounding: Always connect the power supply to a properly grounded AC outlet using the provided three-conductor power cord.
- Load Capacity: Do not exceed the specified continuous or peak current ratings to prevent damage to the unit and connected equipment.
3. Product Overview
The Astron RS-70M-AP is a high-performance linear power supply featuring robust construction and essential protection mechanisms.
Figure 1: Front view of the Astron RS-70M-AP power supply. This image shows the front panel with separate voltage and amperage meters, indicating the output status of the unit. The robust casing and ventilation grilles are also visible.
3.1 Key Features
- Solid State Electronically Regulated
- Fold Back Current Limiting Protection
- Crowbar Over Voltage Protection
- Separate Voltage and Amperage Meters
- Heavy Duty Heat Sink
- Fan Cooled
- Output Terminals: 1/4"-20 Screw Type and Anderson Power Poles
4. Setup
4.1 Unpacking and Inspection
Carefully remove the power supply from its packaging. Inspect the unit for any signs of shipping damage. If damage is found, contact your dealer immediately.
4.2 Placement
Place the power supply on a stable, level surface. Ensure there is at least 6 inches (15 cm) of clear space around all sides, especially the rear and top, for proper ventilation. Do not place the unit near heat sources or in an enclosed cabinet without adequate airflow.
4.3 AC Input Connection
Connect the provided three-conductor power cord to the AC input receptacle on the rear of the power supply. Plug the other end into a standard 105-125VAC, 60Hz grounded wall outlet. Verify that the AC input voltage matches the power supply's requirements.
4.4 DC Output Connection
The RS-70M-AP provides two types of DC output terminals:
- 1/4"-20 Screw Type Terminals: These heavy-duty terminals are suitable for high-current applications. Ensure secure connections to prevent arcing and voltage drops.
- Anderson Power Poles: These connectors provide a convenient and reliable method for connecting compatible equipment. Ensure correct polarity when connecting.
Always observe correct polarity when connecting your equipment to the power supply. The positive (+) terminal is typically red, and the negative (-) terminal is black.
5. Operating Instructions
5.1 Powering On/Off
After all connections are made, turn on the power supply using the front panel power switch. The voltage meter should display approximately 13.8VDC. The amperage meter will show the current draw of the connected load.
5.2 Monitoring Output
The front panel features separate analog meters for voltage and amperage. These meters provide real-time feedback on the power supply's output and the load's current draw.
- Voltage Meter: Displays the DC output voltage. Under normal operation, this should be stable at 13.8VDC.
- Amperage Meter: Displays the total current being drawn by the connected equipment. Ensure this value remains below the continuous duty rating of 57 Amps for prolonged operation.
5.3 Load Considerations
The RS-70M-AP is rated for 57 Amps continuous duty and 70 Amps Intermittent Communication Service (ICS). ICS rating typically implies a duty cycle, such as 10 minutes on and 10 minutes off. Exceeding the continuous rating for extended periods can lead to overheating and trigger protection circuits.
5.4 Internal Voltage Adjustment
The output voltage is internally adjustable from 11-15VDC. This adjustment is intended for specific applications and should only be performed by qualified technicians. Unauthorized internal adjustments may void the warranty and pose a safety risk.
6. Maintenance
6.1 Cleaning
Keep the power supply clean and free of dust. Use a soft, dry cloth to wipe the exterior. Do not use liquid cleaners or solvents. Periodically check the ventilation openings for dust accumulation and clear them to ensure proper airflow.
6.2 Fan and Heat Sink
The unit is fan-cooled and features a heavy-duty heat sink to dissipate heat. Ensure the fan is operating freely and that the heat sink fins are not obstructed. A properly functioning cooling system is crucial for the longevity and stable operation of the power supply.
6.3 Internal Components
There are no user-serviceable parts inside the power supply. Opening the unit will expose you to dangerous voltages and may void the warranty. For any internal issues, contact Astron customer support or a qualified service technician.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No output voltage / Unit does not power on | No AC input power; Blown internal fuse; Faulty power cord | Check AC outlet and power cord connection. If still no power, contact service. Do not attempt to replace internal fuses. |
| Output voltage too low or unstable | Overload condition; Poor DC connections; Internal fault | Reduce load. Check DC wiring for loose connections or shorts. If problem persists, contact service. |
| Unit shuts down or cycles off | Overload; Overheating; Short circuit | Reduce load. Ensure adequate ventilation. Check for short circuits in connected equipment. The unit features Fold Back Current Limiting and Crowbar Over Voltage Protection to prevent damage. |
| Excessive noise (hum) | Ground loop; Faulty AC input; Internal component failure | Ensure proper grounding. Try a different AC outlet. If noise persists, contact service. |
8. Specifications
- Input Voltage: 105-125VAC
- Output Voltage: 13.8VDC ±0.05 volts (Internally adjustable 11-15VDC)
- Continuous Duty Current: 57 Amps
- Intermittent Communication Service (ICS) Current: 70 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
- Product Dimensions (L x W x H): 13.75 x 11 x 6 inches
- Item Weight: 45.2 pounds
- Output Terminals: 1/4"-20 Screw Type and Anderson Power Poles
- Cooling Method: Fan Cooled
- Protection: Fold Back Current Limiting, Crowbar Over Voltage Protection
9. Warranty and Support
For warranty information, please refer to the documentation provided with your purchase or contact your authorized Astron dealer. For technical support or service inquiries, please contact Astron customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.
Astron Customer Support: Please visit the official Astron website for contact details.
