Description
Product Introduction
The Schneider Electric Modicon 140CPS11420 is an AC-operated power supply module engineered for the Modicon Quantum PLC platform. Installed directly into the leftmost or designated power slots of a Quantum backplane, it steps down and regulates raw mains voltage (115V AC or 230V AC) to deliver up to 11 Amps of clean 5.1V DC power to the rack’s internal logic bus.
Designed for flexibility, the 140CPS11420 operates either as a standalone power supply or in a summable configuration alongside another power supply module when dense rack setups demand more current than a single unit can provide. Built-in diagnostic LEDs provide instant status on input voltage health, output DC power levels, and internal fault conditions.
Key Technical Specifications
| Parameter | Specification Details |
| Module Type | AC Power Supply Module (Standalone / Summable) |
| Part Number | 140CPS11420 |
| Manufacturer | Schneider Electric / Modicon |
| Platform Compatibility | Modicon Quantum Automation Series Backplanes |
| Input Voltage (Nominal) | 115V AC / 230V AC (Auto-ranging or selectable depending on hardware revision) |
| Input Voltage Range | 93V AC to 132V AC / 170V AC to 264V AC (47–63 Hz) |
| Output Voltage | 5.1V DC (Regulated backplane logic bus) |
| Output Current | 11 A Continuous Maximum |
| Power Consumption | ~130 VA max at full load |
| Redundancy/Summing | Supports Summable Mode (paralleling two PSUs for increased current) |
| Isolation | 1500V RMS primary to secondary |
Application Scenarios & Field Experience
The 140CPS11420 is a foundational component in Quantum control architectures across power, water, and manufacturing sectors.
- High-Density CPU Racks: Supplying logic power to primary Quantum CPUs coupled with multiple Ethernet coprocessors (NOE/NOA) and high-speed counter cards.
- Summable Backplane Configurations: Paired in a secondary power slot to boost backplane current capacity up to 20A+ for long 16-slot backplanes loaded with analog and digital I/O.
- Water & Wastewater Lift Stations: Delivering stable DC logic power directly from standard 120V AC panel control transformers.
- Packaging & Material Handling: Operating reliably in high-vibration control enclosures controlling high-speed sorters and conveyors.
Field Case Study: A packaging facility faced unexpected mid-shift PLC resets on their primary palletizer rack. Diagnostics revealed the 5V DC backplane rail was dipping to 4.6V under peak load because the original power supply’s output capacitors had degraded after 10 years of heat exposure. Replacing the failing unit with a bench-tested surplus 140CPS11420 restored a clean 5.12V DC rail and completely eliminated the random CPU dropouts.
140CPS11420
140CPS11420
Quality Assurance & Testing Procedure
Every surplus 140CPS11420 module undergoes a complete electrical load-test protocol prior to shipment:
- Visual & Mechanical Check: Inspection of housing vents, terminal block threads, backplane connector pins, and internal heat sink mounting.
- AC Line Isolation Test: High-potential insulation testing between AC input terminals and backplane ground to verify surge barrier integrity.
- Full 11A Load Stress Test: Seated in a test fixture and subjected to a full 11-Amp load on the 5.1V DC output for 4 hours while monitoring voltage stability and ripple on an oscilloscope.
- Thermal Chamber Burn-In: Extended operation under elevated ambient temperatures to ensure internal thermal cutouts and regulation circuits perform without thermal drift.
- ESD-Safe Packaging: Cleaned, anti-static sealed, and packed in custom foam cradles for safe transport.
Technical Field Tips & Traps
- ⚠️ Calculate Your Backplane Current Budget: Before installing a single 140CPS11420, sum up the 5V DC current draw of all cards in the rack (CPU, NOE, I/O modules). If total consumption exceeds 11A, you must add a second summable power supply (such as another 140CPS11420) or upgrade to a higher-capacity module to avoid brownouts.
- ❗ Verify Terminal Block Wiring & Fusing: Ensure line (L), neutral (N), and protective earth (PE) are landed correctly on the removable terminal strip. Always install a dedicated external fast-acting fuse (typically 2A to 3A) on the AC feed side for safety.
- ⚠️ Do Not Mix Non-Summable PSUs: When using dual power supplies on a single backplane for current summing, ensure both modules explicitly support summable/parallel operation. Mixing non-compatible power supplies can cause unequal load sharing and thermal shutdown.
- ❗ Keep Cabinet Vents Clear: Power supplies generate heat. Ensure at least 2 inches of clearance above and below the Quantum rack so natural convection or enclosure fan airflow can dissipate heat from the module’s top and bottom vents.
Frequently Asked Questions
Q: Can the 140CPS11420 be hot-swapped while the Quantum rack is running?
A: If operating as a single standalone power supply, pulling the unit will instantly crash the rack. In a redundant or summable setup, hot-swapping is supported, but care must be taken to ensure the remaining PSU can carry the full logic load during the swap.
Q: Does this module output field sensor power (24V DC)?
A: No. The 140CPS11420 strictly provides 5.1V DC logic power directly to the Quantum backplane. Field devices (transmitters, solenoids, switches) require a separate 24V DC field power supply wired to the I/O terminal blocks.
Q: What is the difference between standalone and summable power modes?
A: Standalone mode uses one supply to power the entire rack. Summable mode allows two power supplies to share the load on the same backplane to deliver more total current than a single module can supply alone.
Q: What LED indications are on the front panel?
A: It features status LEDs for PWR OK (green, indicating normal 5.1V output) and input status indicators to quickly identify blown fuses or lost AC input power.
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