Schneider 140CPS21400 24 VDC 8 A Quantum Power Supply

Description

Key Technical Specifications

Schneider documentation specifies the 140CPS21400 as a 24 VDC Quantum power supply with a 5.1 VDC, 8 A summable output.

Product Introduction

The Schneider Electric 140CPS21400 is a DC power supply module for the Modicon Quantum automation platform. It accepts 20–30 VDC input and supplies 5.1 VDC to the Quantum rack bus at up to 8 A. The summable design allows it to participate in Quantum power-supply configurations requiring additional bus capacity.

This is a legacy Quantum component, so exact replacement selection matters. Schneider currently identifies BMXCPS3020, a Modicon X80 24–48 VDC, 31.2 W power supply, as the recommended replacement. That recommendation should not be interpreted as a blind one-for-one hardware substitution; rack architecture and migration requirements must be checked first.

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation — Approximately 5–10 Minutes

⚠️ Safety First: The module’s input is 20–30 VDC, but the associated rack can contain other hazardous voltages. Put the controlled process in its approved safe state, follow lockout/tagout requirements, and verify the rack is de-energized before removing the module.

Tools Required:

• ESD wrist strap
• Appropriate screwdriver
• Digital multimeter
• Wire labels
• Smartphone or camera
• Quantum hardware documentation

Before removal:

1. Confirm the exact part number: 140CPS21400.
2. Record the Quantum rack and power-supply position.
3. Photograph the existing terminal wiring.
4. Record the incoming DC voltage.
5. Document whether the supply is used in a standalone or summable configuration.
6. Record any associated power-supply alarm wiring.
7. Check the rack’s existing power budget.
8. Back up the PLC application and hardware configuration.

The 140CPS21400 has a 7-point field-wiring connector. Quantum documentation identifies the terminal strip as a separate component, so do not assume the replacement module includes a connector.

Stage 2: Removing the Old Module — Approximately 5 Minutes

1. Turn off and isolate the DC supply.
2. Verify the absence of voltage with a suitable multimeter.
3. Photograph the terminal arrangement immediately before disconnection.
4. Label each conductor.
5. Disconnect the 24 VDC input conductors.
6. Disconnect the power-supply alarm connection if used.
7. Release the module’s retaining mechanism.
8. Pull the power supply straight out of the Quantum rack.
9. Inspect the backplane connector for contamination or damage.
10. Keep the old module until the replacement has completed commissioning.

⚠️ Do not reverse the DC polarity. Verify the positive and negative conductors with the wiring documentation and meter before energizing the replacement.

Stage 3: Installing the New Module — Approximately 5 Minutes

1. Put on a grounded ESD wrist strap.
2. Confirm the replacement is specifically 140CPS21400.
3. Verify the 24 VDC source falls within the specified 20–30 VDC input range.
4. Confirm the correct Quantum rack position.
5. Insert the module carefully into the rack.
6. Ensure it is fully seated.
7. Reconnect the DC input wiring according to the original documentation.
8. Reconnect the alarm circuit if installed.
9. Secure the terminal connections.
10. Inspect the wiring for exposed conductors or loose strands.

Self-Checklist:

• Correct 140CPS21400 model
• Input voltage verified at 20–30 VDC
• DC polarity verified
• Correct rack position
• Alarm wiring documented
• Terminal connections secure
• Module fully seated

Stage 4: Power-On & Testing — Approximately 10 Minutes

1. Perform a final polarity and continuity check.
2. Verify the DC source voltage before connecting the module.
3. Energize the rack according to the approved procedure.
4. Check the green PWR OK LED.
5. Verify that the Quantum bus receives the expected supply voltage.
6. Check the PLC CPU and I/O modules for startup faults.
7. Monitor the rack for repeated resets or abnormal heating.
8. Check the power-supply alarm contact.
9. Verify normal operation with the expected rack load.
10. Return the controlled process to service only after the rack remains stable.

The published specification identifies the green PWR OK LED as the local indication that power is supplied to the bus.

Critical Power-Budget Check

The 140CPS21400 can provide 8 A at 5.1 VDC to the Quantum bus. Do not size the replacement solely from the module’s 8 A rating.

Calculate the actual rack load first:

Required bus current = sum of all installed module bus-current requirements

Then verify the selected power-supply arrangement against that load.

If the original installation uses multiple summable supplies, confirm the exact Quantum compatibility rules. Schneider’s Quantum catalog distinguishes between compatible and incompatible summable power-supply combinations.

140CPS21400

140CPS21400

140CPS21400

Frequently Asked Questions (FAQ)

What is the Schneider 140CPS21400 used for?

The 140CPS21400 supplies power to the internal bus of a Modicon Quantum rack. It accepts 20–30 VDC and provides 5.1 VDC at up to 8 A to the rack bus.

Is the 140CPS21400 an AC or DC power supply?

It is a DC-input power supply. The nominal input is 24 VDC, with an operating range of 20–30 VDC. Do not confuse it with Quantum AC-input models such as the 140CPS11400 series.

Is the 140CPS21400 obsolete?

Yes, but the exact lifecycle date depends on the Schneider regional market. Schneider USA lists the part as discontinued on September 15, 2023 and end-of-service on December 31, 2024. Schneider UK currently shows a different lifecycle schedule.

For procurement, treat it as a legacy spare and verify the actual stock condition.

What is the Schneider replacement for 140CPS21400?

Schneider Electric identifies BMXCPS3020 as the recommended replacement. BMXCPS3020 is an X80 power supply with a 24–48 VDC input and 31.2 W rating.

⚠️ That does not mean it should be installed into an existing Quantum rack as a simple plug-in substitute. The Quantum-to-X80 transition requires an architecture and compatibility review.

Does the 140CPS21400 support summing?

Yes. The 140CPS21400 is specifically classified as a summable power supply with an 8 A maximum output.

When multiple supplies are combined, verify that the exact power-supply models are permitted in the intended Quantum configuration. Schneider’s Quantum catalog provides specific compatibility rules for summable supplies.

Does the 140CPS21400 have an alarm relay?

Yes. The specification identifies one normally closed alarm output rated at 6 A, 220 V. The module also provides a green PWR OK LED for local status indication.

What fuse should be used with the 140CPS21400?

The published specification recommends a 5 A slow-blow external fuse. Always verify the final protection arrangement against the plant electrical design and applicable local requirements.

What condition should I specify when buying a 140CPS21400?

State the condition explicitly:

• Factory Sealed — original unopened factory packaging
• New Original / New Surplus — unused original equipment outside normal current distribution
• Refurbished (tested) — previously used equipment that has been inspected and functionally tested

For a critical Quantum spare, ask for photographs of the actual 140CPS21400 label, serial information, terminal connector, packaging, and test report. Do not treat “new” as sufficient condition information. The supplied product-page framework specifically requires transparent condition disclosure.