Key Technical Specifications
| Parameter | Value |
|---|---|
| Rated Output Voltage | 24 V DC ±1% |
| Rated Output Current | 40 A (-25°C to 60°C) |
| Output Power | 960 W |
| POWER BOOST Current | 45 A (Constant up to 40°C) |
| SFB Peak Current | 215 A for 12 ms |
| Input Voltage Range (AC) | 85 V AC … 264 V AC |
| Input Voltage Range (DC) | 90 V DC … 300 V DC |
| Efficiency | >92% (at 230 V AC) |
| Output Adjustment Range | 18 V DC … 29.5 V DC |
| Dimensions (W x H x D) | 180 mm x 130 mm x 125 mm |
| Protection Class | IP20 |
| Operating Temperature | -25°C … 70°C (>60°C derating 2.5%/K) |
Product Introduction
Phoenix Contact 2866789 QUINT-PS/1AC/24DC/40 converts single-phase AC or DC input into regulated 24 V DC for industrial control loads. This primary switched-mode unit integrates Selective Fuse Breaking (SFB) technology to trip standard circuit breakers reliably during short circuits.Field engineers value the 215 A peak current pulse (12 ms duration) because it clears downstream faults before upstream breakers trip. The POWER BOOST function delivers 45 A continuously for heavy motor starts, while preventive monitoring signals critical states before failure occurs. (Note: Output voltage above 24 V DC reduces available stable capacity.)
Installation & Configuration Guide
Preparation (10 min)
- Verify input voltage matches site supply (85–264 V AC or 90–300 V DC).
- Confirm upstream protection is 16 A–20 A (B/C/D/K characteristic).
- Gather torque screwdriver and insulated tools.
- Ensure DIN rail is grounded and meets 35 mm standard.
Removal (5–10 min)
- De-energize upstream breaker and apply lockout/tagout.
- Measure output terminals to confirm 0 V DC.
- Loosen terminal screws; disconnect load and input wires.
- Pull unit upward off DIN rail clips.
Installation (10 min)
- Hook top rail clip first, then press bottom until audible click.
- Maintain 5 mm lateral clearance and 50 mm vertical clearance for airflow.
- Connect input wires to L/N/PE terminals; torque to spec.
- Connect output wires to +V/-V terminals; verify polarity.
Power-On & Test (10 min)
- Close upstream breaker; observe green “DC OK” LED.
- Measure output at load terminals: must read 24 V DC ±10%.
- Check for abnormal heat or noise during first 5 minutes.
- Verify signal contacts if using preventive monitoring.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Corrective Action |
|---|---|---|
| No Output / LED Off | Input power missing or fuse blown | Measure input voltage; check upstream breaker |
| Intermittent Output | Loose terminal connection | Retorque all power terminals to specification |
| Output Overvoltage | Potentiometer misadjusted | Measure output; adjust trim pot to 24.0 V DC |
| SFB Trips Repeatedly | Downstream short circuit | Isolate load branches; check cable insulation |
| Excessive Heat (>60°C) | Overload or high ambient | Reduce load current; improve cabinet ventilation |
| DC OK LED Flickering | Input voltage sag | Measure input under load; verify wire gauge |
Dimensions, Mounting & Wiring Notes
- Height x Width x Depth: 130 mm x 180 mm x 125 mm
- Mounting: Standard 35 mm DIN rail (EN 60715)
- Terminal Type: Screw connection
- Installation Clearance: 5 mm left/right, 50 mm top/bottom
- Wiring Note: Use copper conductors only; ensure no stray strands cause short circuits.
- Grounding: PE terminal must connect to system ground for EMC compliance.
FAQ
Can I use this power supply with a 110 V DC input?
Yes. The 2866789 accepts 90 V DC to 300 V DC input. Just verify your DC source ripple stays within limits and derate if below 120 V DC.I need to replace an older QUINT unit. Is 2866789 a direct drop-in?
Usually yes, but check dimensions. This unit is 180 mm wide; older or lower-current models may be narrower. Verify DIN rail space and terminal positions before ordering.Why does my SFB trip instantly on power-up?
Likely a downstream short or capacitor inrush exceeding 215 A. Disconnect load wires and power up empty. If output is stable, fault is in the load, not the PSU.Do you offer warranty on refurbished units?
Refurbished units carry a 12-month functional warranty. We test every unit on a dedicated QUINT test rack with full load simulation. Function verified under test conditions, not guaranteed for infinite life.Is this unit still manufactured by Phoenix Contact?
Yes, 2866789 remains an active catalog item. Always cross-reference the Order Key on the label to avoid obsolete suffix variants.What’s the biggest mistake integrators make with this PSU?
Skipping the 20% capacity margin. If your load draws 40 A continuously, this unit runs at 100% and derates fast above 40°C. Size for 32 A max continuous load to ensure longevity.Can I parallel two of these for 80 A?
Yes, but only with the optional redundancy module or proper decoupling diodes. Direct parallel connection without balancing causes current hogging and premature failure.
