Schneider Modicon 140CPS11420 115/230VAC Standalone Power Supply

Description

Product Introduction

The Schneider Electric Modicon Quantum 140CPS11420 is an 11-Amp standalone AC power supply module engineered to power CPUs, communication coprocessors, and I/O modules across Quantum backplanes. Accepting user-selectable input voltages of 115 VAC or 230 VAC, it converts line power into a clean, regulated 5.1 VDC logic supply distributed directly through the backplane bus.

Designed for high-reliability standalone (non-redundant) rack layouts, the 140CPS11420 incorporates built-in overcurrent, overvoltage, and thermal protection circuits. It features an integrated power OK relay contact to alert supervision systems in the event of primary power loss, making it a critical power backbone for legacy Modicon automation setups.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

The Trench Story: It is 2:00 AM on a humid night at a regional municipal pumping station. A sudden utility voltage sag trips the station, but when power returns, the Quantum main rack remains completely dark. The power LED on the original 140CPS11420 supply is dead—its primary filter capacitors finally failed under the thermal stress of an unconditioned cabinet. Without 5.1V backplane power, the CPU won’t boot, leaving three 500-HP pumps unresponsive. Swapping in a bench-tested replacement 140CPS11420 module from emergency spares returns regulated power to the bus and restores station SCADA control within 20 minutes.

Application Scenarios:

• Municipal Water Distribution: Main rack logic power for raw water intake and high-service pump control panels.
• Automotive Material Handling: Powering local Quantum I/O racks driving body-shop conveyor transfer systems.
• Continuous Process Plants: Supplying backplane logic for standalone mixing and batching controller racks.
• HVAC Central Plants: Main power module for large chiller plant and air handler PLC enclosures.

Transparency SOP: Quality Assurance & Testing

We do not just ship boxes; we test them under full electrical load on actual Modicon Quantum backplanes. Every 140CPS11420 power supply undergoes a strict 5-step validation process before stocking:

1. Inbound Component Check: Inspection of backplane connector pins, mechanical locking tabs, top/bottom ventilation ports, and internal capacitor condition.
2. Dual-Input Power Validation: Verified under both 115 VAC and 230 VAC utility power inputs to ensure proper voltage selector switch and input stage operation.
3. Full-Load Stress Test: Loaded to its full 11-Amp output capacity on a multi-slot Quantum rack populated with CPUs and high-draw I/O modules for a minimum 4-hour burn-in.
4. Ripple & Protection Verification: Oscilloscope checks to verify 5.1 VDC output voltage ripple remains within factory tolerances, along with testing thermal and short-circuit shutdown response.
5. ESD Clearance & Safe Packaging: Thoroughly cleaned, sealed in static-shielding bags, and packaged with heavy-duty foam inserts to protect against transit shock.

140CPS11420

140CPS11420

The Veteran’s Tech Trap Guide

⚠️ Check the voltage selector switch BEFORE applying power! The 140CPS11420 features a slide switch on the module body to select 115 VAC or 230 VAC input. Applying 230 VAC line power while the switch is set to 115 VAC will immediately destroy the input varistors and blow the internal fuse.

❗ Never pair this in a redundant power configuration. The 140CPS11420 is a standalone module. If you attempt to install two 140CPS11420 supplies in the same rack for redundancy, backplane back-feeding can cause unstable voltage regulation or damage the supplies. For redundant power architectures, you must use the 140CPS11420’s redundant counterparts (e.g., 140CPS12420).

⚠️ Calculate your total rack backplane power draw. The 140CPS11420 provides 11 Amps at 5.1 VDC. If your rack contains a CPU, network coprocessors (NOE/NOA cards), and multiple high-density I/O modules, sum up the 5V bus current requirements. Exceeding 11A total draw will cause intermittent CPU resets or unexpected bus communication drops.

❗ Keep ventilation paths clear. These power modules rely on convection cooling through the top and bottom housing vents. Installing this card directly adjacent to heat-generating external components or letting dust build up on the vents will cause premature thermal degradation of internal electrolytic capacitors.

Frequently Asked Questions

Q: Can I hot-swap the 140CPS11420 power supply while the rack is live? A: No. Because this is a standalone (non-redundant) power supply, pulling the 140CPS11420 will instantly remove logic power from the backplane, shutting down the CPU and all installed I/O modules. Always power down the main AC supply before removing or inserting the unit.

Q: What is the main difference between the 140CPS11420 and the 140CPS11410? A: The primary difference is output current capacity. The 140CPS11420 provides an 11A output capacity (56.1W total bus power), whereas the 140CPS11410 delivers a lower output current rating intended for smaller, low-density rack configurations.

Q: How do I know if the internal fuse is blown on the 140CPS11420? A: If input voltage is verified at the terminal block but the front panel “Power OK” LED remains off and the relay contact stays open, the internal primary fuse has likely cleared due to an overcurrent event or internal component failure.

Q: Does the module come with the AC input terminal block? A: Removable Terminal Blocks (RTBs) are typically sold separately unless specifically noted as included. You can reuse the existing 3-pin AC terminal connector from your current installation.

Q: What warranty is provided with these discontinued Quantum power supplies? A: Every unit comes with our full 12-month operational warranty. We bench-test each power supply under a full 11A electrical load prior to shipment to ensure factory-spec voltage regulation out of the box.