Description
Product Introduction
The Schneider Electric Modicon 140CPS21400 is a DC-operated power supply module built specifically for the Modicon Quantum PLC platform. Operating on a nominal 24V DC input (with a flexible 20V DC to 30V DC operational range), it steps down and conditions incoming power to provide up to 8 Amps of ultra-clean 5.1V DC power directly to the rack’s internal backplane logic bus.
Engineered for high reliability in battery-backed or direct DC industrial environments, the 140CPS21400 can function as a standalone power unit or operate in a summable configuration alongside an additional power supply module. This allow system integrators to scale up backplane current delivery when fully populating 16-slot Quantum chassis with high-draw coprocessors and digital/analog modules.
Key Technical Specifications
| Parameter | Specification Details |
| Module Type | DC Power Supply Module (Standalone / Summable) |
| Part Number | 140CPS21400 |
| Manufacturer | Schneider Electric / Modicon |
| Platform Compatibility | Modicon Quantum Automation Series Backplanes |
| Input Voltage (Nominal) | 24V DC |
| Input Voltage Range | 20V DC to 30V DC |
| Output Voltage | 5.1V DC (Regulated backplane logic bus) |
| Output Current | 8 A Continuous Maximum |
| Input Current at Full Load | ~2.3 A at 24V DC |
| Protection Features | Overcurrent limiting, overvoltage protection, reverse polarity protection |
| Redundancy/Summing | Supports Summable Mode (paralleling two PSUs for increased current) |
| Isolation | 1000V DC input-to-backplane |
Application Scenarios & Field Experience
The 140CPS21400 is heavily utilized in plants that standardize on 24V DC battery backup systems (UPS) to guarantee unbroken PLC operation during total AC mains failures.
- Oil & Gas Pipeline Compressor Stations: Running directly off station 24V DC battery banks to ensure zero control downtime during main grid loss.
- Offshore Platforms & Marine Vessels: Operating in DC-native environments where AC power is restricted or prone to heavy harmonic distortion.
- Solar & Off-Grid Utility Enclosures: Providing stable backplane power to remote telecommunication and telemetry Quantum racks.
- Substation Automation: Integrating into 24V DC battery-backed switchgear monitoring panels.
Field Case Study: A remote gas compression site experienced recurring PLC drops due to erratic generator AC power during storm season. The facility retrofitted the Quantum chassis with a 140CPS21400 powered directly by a regulated 24V DC battery bank. The direct DC feeding isolated the PLC backplane from AC generator frequency fluctuations, completely restoring 100% uptime through subsequent power outages.
140CPS21400
140CPS21400
140CPS21400
Quality Assurance & Testing Procedure
Every surplus 140CPS21400 module undergoes a rigorous testing protocol before dispatch:
- Visual & Structural Audit: Inspecting PCB traces for thermal stress, checking terminal block screw threads, backplane connector pins, and casing alignment.
- Reverse Polarity & Isolation Testing: Verifying reverse protection diodes and measuring high-potential insulation between 24V DC input terminals and frame ground.
- Full 8A Load Stress Test: Seated in a test fixture and subjected to a full 8-Amp load on the 5.1V DC output for 4 hours while monitoring output regulation and AC ripple on an oscilloscope.
- Input Swing Test (20V to 30V DC): Sweeping input voltage across its entire operating range to guarantee the 5.1V DC backplane rail remains rock-solid without thermal shutdown.
- ESD-Safe Packaging: Cleaned, anti-static sealed, and custom-cradled for safe transit.
Technical Field Tips & Traps
- ⚠️ Calculate Your Backplane Current Budget: The 140CPS21400 provides 8 Amps of 5.1V DC backplane power (compared to 11A on its AC counterpart, the 140CPS11420). If your dense 16-slot rack requires more than 8A total, you must install a second summable power supply to avoid brownouts and CPU faults.
- ❗ Mind the DC Wire Gauge: Because 24V DC currents are higher than 120/230V AC currents for the same power rating, ensure input feed wires are appropriately sized (typically 14 AWG) to prevent voltage drops across long terminal runs.
- ⚠️ Check Input Polarity Before Energizing: While the module includes protection, wiring +24V DC and 0V DC backwards can blow internal input fuses or trip upstream DC circuit breakers.
- ❗ Verify Terminal Block Tightness: Loose 24V DC terminal connections create high contact resistance, leading to local terminal block heating and nuisance low-voltage trips under full rack load.
Frequently Asked Questions
Q: Can I run two 140CPS21400 power supplies on the same backplane?
A: Yes. The 140CPS21400 supports summable mode, allowing two identical units to sit on the same backplane to increase available 5.1V DC current for large card configurations.
Q: Does the 140CPS21400 provide 24V DC power to my field sensors?
A: No. The module consumes 24V DC from an external power source solely to generate 5.1V DC logic power for the Quantum backplane. Field I/O devices require their own dedicated 24V DC field power loop.
Q: Is this module hot-swappable while the PLC is running?
A: If it is the sole power supply on the rack, removing it will immediately shut down the PLC. In a redundant or dual-summable configuration, hot-swapping is supported provided the remaining supply can carry the active current load.
Q: What LED indicators are located on the front panel?
A: The module features a PWR OK LED (green when 5.1V DC output is within specification) and input status indicators to quickly verify that incoming 24V DC is present.
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