Description
The Schneider Electric 140CPS21400 is a redundant,high-capacity power supply module designed for the Modicon Quantum®programmable logic controller(PLC)platform—a widely deployed automation system in industries such as water/wastewater,oil&gas,power generation,mining,and manufacturing.
This module delivers 24 VDC at 14 A continuous output(336 W)and supports hot-swappable,redundant operation when paired with a second 140CPS21400 in the same backplane.Its primary role is to ensure uninterrupted power to the Quantum I/O and processor modules during maintenance,component failure,or input power disturbances—critical for continuous-process applications where downtime is unacceptable.
Key Technical Specifications
Parameter Specification
Model 140CPS21400
Manufacturer Schneider Electric
Product Line Modicon Quantum(Legacy,but still widely supported)
Output Voltage 24 VDC±3%(regulated)
Continuous Current 14 A
Peak Current Up to 18 A for short durations(e.g.,I/O surge at startup)
Input Voltage 85–264 VAC,47–63 Hz(universal auto-ranging)
Also supports 100–300 VDC input
Efficiency>85%typical
Redundancy Mode Yes–supports active/standby or load-sharing with second unit
Hot-Swap Capable✅Yes–can be replaced without powering down the rack
Backplane Compatibility Standard Modicon Quantum backplanes(e.g.,140CRA93100,140CRP81100 racks)
Mounting Position Leftmost slot(s)in Quantum chassis(Slot 0 and/or Slot 1)
Indicators
–Green LED Power OK/Output active
–Red LED Fault(overload,overtemp,fan failure,input loss)
Cooling Internal fan(field-replaceable on some revisions)
Operating Temperature 0°C to+60°C
Certifications CE,UL,CSA,ATEX(for hazardous area variants),IEC 61131-2
Dimensions 100 mm(W)×290 mm(H)×240 mm(D)–occupies one Quantum slot
Application Scenarios
Water Treatment Plant SCADA:
In a major European water facility,two 140CPS21400 units power a Quantum PLC controlling chemical dosing,filtration,and pump sequencing.During a routine fan replacement on one power supply,the redundant unit seamlessly carried the full load—zero process interruption.
Oil Pipeline Terminal:
The power supplies feed a Quantum system managing tank farm level control,valve actuation,and leak detection.Their dual AC/DC input capability allows operation from either mains power or backup DC battery banks during blackouts.
Steel Mill Rolling Stand:
Despite high ambient temperatures and electrical noise,the 140CPS21400’s robust design ensures stable 24 VDC to high-speed I/O modules reading encoder and pressure signals at millisecond cycles.
Redundancy Operation Principle
When two 140CPS21400 modules are installed in Slot 0 and Slot 1:
Both units share the load(~7 A each under normal conditions).
If one fails(e.g.,fan fault,overtemp,or input loss),the other instantly supplies up to 14 A to maintain system operation.
The failed unit can be removed and replaced while the system runs.
Backplane diodes prevent back-feeding and isolate faults.
⚠️Note:Redundancy requires a Quantum backplane that supports redundant power(most standard chassis do).Verify compatibility with your baseplate(e.g.,140CHS11000,140CRA93200).
Common Failure Modes&Diagnostics
Symptom Likely Cause Action
Red LED ON Overload,overtemperature,fan failure,or input voltage out of range Check load current;verify ventilation;measure AC/DC input
No Output(Green OFF)Blown internal fuse,severe fault,or incompatible backplane Replace module;confirm chassis supports CPS21400
Intermittent Shutdown Weak fan,dust buildup,or marginal input voltage Clean vents;check AC line stability
Red+Green Flashing Communication fault with backplane or firmware mismatch Power cycle;verify module seating
🔧Maintenance Tip:
Even in redundant setups,replace both units after 8–10 years—electrolytic capacitors degrade over time,increasing risk of simultaneous failure.
Related Power Supply Modules in Quantum Family
Model Output Redundant?Notes
140CPS11420 24 VDC/8 A No Non-redundant,lower power
140CPS12400 24 VDC/11 A No Mid-range,non-redundant
140CPS21400 24 VDC/14 A✅Yes High-power redundant
140CPS22400 24 VDC/14 A✅Yes Similar,but with conformal coating for harsh environments
140CPS11400 5 V/3 V logic supply No For legacy CPU backplanes(rare)
Obsolescence&Migration Path
The Modicon Quantum platform is in”mature support”(not obsolete,but no new development).
Schneider recommends migrating to Modicon M580 ePAC(Ethernet-based,open architecture)or M310/M262 for new projects.
However,140CPS21400 remains available through Schneider’s long-term supply program and authorized distributors.
Availability&Support
We offer genuine Schneider 140CPS21400 power supplies—new surplus or factory-refurbished—with:
Full load testing(14 A 24 VDC,thermal imaging)
Fan and capacitor health verification
Compatibility confirmation with your Quantum chassis
24-month warranty
Our automation specialists can assist with:
Redundancy configuration validation
Load calculation for your I/O count
Migration planning to M580 or EcoStruxure™Control Expert platforms
Emergency cross-ship for critical outages
Final Note
The 140CPS21400 may sit quietly in the left slot of a Quantum rack,but it is the unsung guardian of uptime.In systems where a single power glitch could trigger a plant-wide trip,this module’s redundancy,reliability,and hot-swap capability make it indispensable.
Contact us for technical datasheets,installation manuals,load calculators,or urgent spares for your Modicon Quantum system.
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