Description
Schroff Philips PE-1957/26 | 24VDC Switch-Mode Power Supply Specs
Architect’s Product Breakdown
The Schroff / Philips PE-1957/26 operates as a ruggedized switch-mode power supply designed for integration into standard 19-inch subracks, industrial computer enclosures, and modular process automation chassis. Built to supply clean, regulated power in high-EMI factory environments, this hardware model converts wide-range AC utility power into a tightly controlled 24 VDC rail. By delivering continuous currents up to 10 Amperes, it powers distributed I/O racks, PLC processors, interface relays, and optocoupler networks across continuous manufacturing lines.
Deploying or replacing this model in an operational control cabinet requires strict verification of line input voltage jumpers/switches prior to energizing. Featuring heavy-duty noise filtering, low ripple output, and thermal overload protection, the unit prevents voltage sag and line transients from corrupting downstream microprocessors. When carrying out field swaps in legacy control racks, field technicians must ensure that rear DIN/Eurocard multi-pin connectors are securely seated and that proper cabinet ventilation gaps are maintained to prevent thermal trip states.
PE-195726
Key Technical Specifications
- Manufacturer: Schroff (nVent / Pentair) / Philips Industrial Automation
- Product Category: Switch-Mode Power Supply (SMPS) Module
- Part Number / Catalog No.: PE-1957/26 (PE195726 / PE-195726)
- Input Voltage Range: 115 VAC / 230 VAC (Selectable) or 110–220 VDC
- Output Voltage: 24 VDC nominal (Adjustable \pm 10\%)
- Output Current: 10 A Continuous (15 A peak overload capacity)
- Output Regulation: \pm 0.5\% Line and Load regulation
- Ripple & Noise: < 50 mV_p-p at full load
- Efficiency: > 85\% typical
- Form Factor / Mounting: 19-inch subrack plug-in / Eurocard slide-in cassette format
- Operating Temperature Range: -20°C to +60°C (thermal derating above 50°C)
- Weight: Approximately 2.65 kg (5.84 lbs)
Field Engineer’s Pitfall Guide (Unique Value)
- Input Voltage Selection Jumper Error: The PE-1957/26 module supports dual AC input ranges (115V or 230V). Applying 230 VAC line power while the internal selection switch or terminal jumper is set for 115 VAC will immediately destroy the input bridge rectifier and primary smoothing capacitors.
- Inadequate Convection Ventilation Space: These high-density switch-mode power supplies rely on free air convection through chassis ventilation slots. Packing slide-in modules tightly against solid bulkheads without leaving a minimum 20 mm vertical clearance will trigger thermal shutdown or dry out electrolytic capacitors over time.
- Undersized DC Output Wiring Runs: Running undersized gauge wire over long distances for a 10 A load causes severe ohmic voltage drops. If the terminal voltage drops below 21.6 VDC at remote I/O drops, connected PLC cards may trip low-voltage alarm flags.
QA & Testing SOP (Transparency)
- Visual & Origin Verification: Units undergo microscopic optical inspection to confirm clean card-edge connector pins, undamaged heat-sink fins, unbent front panel extraction handles, and authentic OEM labels.
- Live Bench Voltage & Current Load Testing: Modules are installed on a dedicated test bench with a variable AC auto-transformer (Variac) and programmable electronic load to evaluate regulation across the full 0–10 A range.
- Ripple, Noise & Overload Protection Diagnostics: Technicians monitor output ripple using an oscilloscope to verify noise stays below 50 mV_p-p, then trip internal overcurrent and overvoltage protection circuits to confirm automatic shutdown and recovery.
- Anti-Static Packaging: Post-testing units are fitted with protective connector covers, wrapped in multi-layer conductive ESD shielding bags, and packed in high-density anti-static foam.
Technical FAQ
Can I adjust the output voltage on the PE-1957/26 power supply?
Yes. This model includes a front-panel trim potentiometer allowing fine adjustment of the 24 VDC output rail by approximately \pm 10\% (21.6 V to 26.4 V) to compensate for line loss.
Is this power supply hot-swappable in a live 19-inch rack enclosure?
No. Standard subrack backplane pins are not hot-swap rated for high AC currents. Always shut down primary AC power to the chassis before inserting or removing the power supply cassette.
How do I select between 115 VAC and 230 VAC operating modes?
Input voltage selection is configured via a physical selector switch or wire jumper block on the chassis or circuit board. Always check this setting prior to applying utility power.
What is the standard warranty status for surplus inventory units?
Verified surplus or refurbished industrial power modules typically carry a 12-month operational warranty covering material and manufacturing defects under standard operating conditions.
