Key Technical Specifications
- Product Model: TR-500Q-P-F1 (3503311-02)
- Manufacturer: SWITCHING
- Application System: Industrial control racks, DCS, PLC and automation I/O systems
- Rated Power: 500 W
- AC Input: 85–264 VAC, 47–63 Hz
- DC Output: Regulated 24 VDC
- Protection Features: Overvoltage, overcurrent, short-circuit, over-temperature lockout
- Efficiency: Up to 94% at nominal load
- Operating Temperature: -20 °C to +70 °C (with adequate cabinet airflow)
- Mounting: DIN rail or rack chassis mounting
- Enclosure Rating: IP20, indoor cabinet use only
- Redundancy: Supports parallel redundant operation with external current sharing
Product Introduction
This SWITCHING TR-500Q-P-F1 3503311-02 is a 500-watt switching power supply built for continuous industrial cabinet operation. It delivers stable 24 VDC power to control cards, field I/O and communication hardware. Linear supplies waste excess power as heat. This unit uses high-frequency switching conversion, with efficiency up to 94%, to cut thermal load inside densely packed automation racks.
Installation & Configuration Guide
Preparation (10 min) Gather ESD wrist strap, multimeter, insulated screwdriver. Lock out cabinet AC source. Photograph existing wiring before disconnecting. Removal (5–10 min) De-energize upstream circuit. Label AC input and DC output wires. Release DIN rail latch or rack mounting screws. Pull terminal wires one at a time. Installation (10 min) Clip unit onto DIN rail or fasten to rack. Wire AC input and 24 VDC output terminals. Torque screws to OEM recommended value. Separate AC and DC wiring paths. Power-On & Test (10 min) Restore AC supply. Check power status LED. Measure DC output voltage under load. Test shutdown by triggering overcurrent simulation if bench setup allows.
Troubleshooting Quick Reference
| Symptom | Likely Cause | Check Action |
|---|---|---|
| No DC output, LED off | No AC input or internal fuse blown | Measure AC voltage at input terminals; inspect fuse |
| DC output low under load | Exceeded power rating or poor ventilation | Calculate total load wattage; check cabinet fan airflow |
| Unit shuts down intermittently | Over-temperature or loose terminal | Touch enclosure surface; retighten power terminals |
| Output voltage drifts | AC input outside rated range | Measure incoming AC; check for large voltage sags |
| Parallel redundancy fails | Missing current share wiring or mismatched units | Confirm matching model; verify current share connections |
Dimensions, Mounting & Wiring Notes
- H×W×D: 120 mm × 200 mm × 45 mm
- Mounting method: DIN 35 mm rail or chassis screw mounting
- Terminal notes: Use 14–18 AWG stranded wire. Route DC output cables away from high-current AC and variable-frequency drive cables. Keep cabinet air vents unblocked.
FAQ
Q: Can I use this unit for safety instrumented system loads? A: It is a general industrial PSU. It does not carry SIL certification unless stated on OEM datasheet. Q: What total load can I connect to this 500 W supply? A: Max continuous load is 500 W. Maintain a 20% power margin; do not run above 400 W steady state. Q: Is this unit factory new sealed? A: New original factory sealed stock is limited. Most available stock is surplus or fully refurbished. Q: I want to run two of these units in parallel for redundancy. Does it support that? A: Yes. It supports parallel operation with external current sharing. Use identical model units only. Q: What is the main risk when replacing a rack power supply? A: Backplane voltage transients can damage I/O cards. Power down the full rack before swapping. Q: How long does your pre-shipment functional test run? A: 24-hour continuous load burn-in, plus output voltage measurement and protection function testing. Q: Does this unit shut down automatically on short circuit? A: Yes. Short-circuit protection engages and latches off. Cycle AC power to reset after fault removal.
