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Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Redundant power supply module |
| Platform | Modicon Quantum automation platform |
| Input Voltage | 115 V AC: 93–138 V; 230 V AC: 170–276 V |
| Input Frequency | 47–63 Hz |
| Input Current | 1,100 mA at 115 V; 600 mA at 230 V |
| Inrush Current | 38 A at 115 V; 19 A at 230 V |
| Rated Power | 130 VA |
| Output Voltage | 5.1 V DC |
| Output Current | 8 A at 60 °C in redundant operation |
| Associated Fuse | 2 A slow-blow |
| Output Protection | Internal overvoltage and overload protection |
| Power Dissipation | 6+(1.5×Iout)6 + (1.5 \times I_{out}) W, where IoutI_{out} is in amperes |
| Local Signaling | One green PWR OK LED |
| Module Format | Standard Quantum module |
| Operating Temperature | 0 to 60 °C |
| Storage Temperature | −40 to +85 °C |
| Relative Humidity | 95% non-condensing |
| Operating Altitude | Up to 5,000 m |
| Weight | Approximately 0.65 kg |
| Certifications | UL 508; CSA C22.2 No. 142; CE |
Schneider Electric lists the 140CPS12400 as a 115/230 V AC redundant power supply and states that it has not been replaced. Confirm current lifecycle status and available support in your purchasing region.
Product Introduction
The Schneider Electric 140CPS12400 is a redundant AC power supply module for Modicon Quantum PLC racks. It accepts 115 V AC or 230 V AC at 47–63 Hz and provides a regulated 5.1 V DC backplane supply rated at 8 A in redundant operation.
Use it where Quantum rack availability depends on redundant power architecture. The module includes internal overvoltage and overload protection plus a green PWR OK indicator. Verify the rack’s total current demand, input voltage range, fuse size, and redundancy arrangement before installation.
140CPS12400
140CPS12400
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No green PWR OK LED | Missing AC input, blown fuse, or failed power supply | ✅ High | Measure 115 V AC or 230 V AC at the input terminals and check the 2 A slow-blow fuse | Restore input power or replace the module if correct voltage reaches the terminals |
| Quantum rack is completely offline | Power supply failure, backplane fault, or excessive rack load | ✅ High | Measure the 5.1 V DC backplane output and inspect adjacent rack power indicators | Check rack load and backplane condition before installing a replacement |
| PWR OK LED flickers | Low input voltage, loose terminal, thermal stress, or overload | ✅ High | Measure input voltage while loaded and inspect terminals for heat discoloration or looseness | Correct the input connection and calculate rack load; replace only after the external checks pass |
| Module trips the upstream breaker | Short circuit, incorrect fuse, or internal power-supply fault | ✅ High | Isolate the module, verify the fuse type, and check for abnormal current on energization | Do not repeatedly reset the breaker; isolate and replace the PSU if the fault follows it |
| 5.1 V DC output is low | Rack overload, poor backplane connection, or failing supply | ✅ High | Measure directly at the power-supply output and compare with the 5.1 V DC specification | Remove nonessential load only under an approved procedure; replace the module if output remains low |
| Rack works until warm | Thermal overload or aging components | ✅ High | Monitor the 5.1 V output and module temperature during operation at 0–60 °C ambient conditions | Check ventilation and rack current; replace the module if failure correlates with temperature |
| Only part of the rack loses power | Backplane segment, connector, or redundant supply path fault | ❌ Low to medium | Check the 5.1 V supply at multiple rack points and compare both redundant supplies | Investigate the backplane and distribution path before replacing the PSU |
| Replacement will not power the rack | Wrong model, incorrect input selection, or wiring error | ✅ High | Compare the complete part number and measure the applied AC voltage against the terminal markings | Stop energizing; verify 115/230 V wiring and the exact Quantum power-supply model |
| Redundant operation is unavailable | Mismatched supplies, incorrect rack arrangement, or one supply not recognized | ✅ Medium | Check PWR OK indications on both supplies and review Quantum rack diagnostics | Verify the redundancy architecture and supply compatibility |
| Repeated fuse failure | Shorted module, wiring fault, or incorrect fuse rating | ✅ High | Confirm the fuse is a 2 A slow-blow type and test the module with the circuit isolated | Find the fault before fitting another fuse; do not bypass the specified protection |
The 140CPS12400 carries hazardous AC input. Use lockout/tagout, verify absence of voltage, and follow the Quantum installation manual before removing the module. If the problem remains unresolved, contact technical support with the module label, input-voltage measurement, fuse details, PWR OK status, rack current calculation, and diagnostic logs.
Frequently Asked Questions (FAQ)
What does the Schneider Electric 140CPS12400 do?
It converts 115 V AC or 230 V AC input power into the 5.1 V DC supply used by a Modicon Quantum rack backplane. It is designed for redundant Quantum power-supply arrangements and provides up to 8 A in redundant operation.
Can I connect the 140CPS12400 to either 115 V AC or 230 V AC?
Yes, the documented input ranges are 93–138 V AC for a nominal 115 V supply and 170–276 V AC for a nominal 230 V supply. Verify the terminal wiring and site voltage before energizing the module.
Is the 140CPS12400 a 24 V DC power supply?
No. The verified product data identifies its output as 5.1 V DC at 8 A for the Quantum backplane. Listings that describe this exact part as a 24 V DC, 20 A DIN-rail supply are inconsistent with Schneider Electric’s product data and should not be used for ordering.
Is this a direct replacement for another Quantum power supply?
Do not assume compatibility from the output voltage alone. Confirm the complete part number, input range, rack type, current capacity, connector arrangement, and redundant-system requirements. Schneider Electric’s product page indicates that the 140CPS12400 has not been replaced.
Can I hot-swap the 140CPS12400?
Only if the specific Quantum rack and redundant power arrangement are approved for live replacement under the applicable installation documentation and site procedure. Otherwise, isolate the AC supply first. The module has hazardous input voltage, and removing it under load can damage equipment or expose personnel to electrical energy.
How do I size the replacement power supply?
Calculate the total 5.1 V DC backplane demand of every CPU, communication module, and I/O module in the rack. Confirm that the demand remains within the 8 A redundant output rating, with the site’s required engineering margin. Do not rely on the physical number of installed modules alone.
Why may surplus stock cost less than a factory replacement?
The unit may be New Surplus, opened stock, or Refurbished and Tested rather than current factory-distributed inventory. Request a clear condition statement, current photos of the label, input/output test results, warranty terms, and return conditions. For this PSU, ask specifically whether the seller verified both AC input ranges and the 5.1 V DC output under load.
