Schneider 140CPS12420 11A Redundant AC Power Module

Description

Key Technical Specifications

Schneider’s Quantum documentation specifies 93–138 VAC or 170–276 VAC input, 5.1 VDC backplane output, and an 11 A maximum bus current at 60 °C in standalone operation. In a redundant configuration using two 140CPS12420 supplies, the total capacity is documented as 10 A at 60 °C.

Product Introduction

The Schneider Electric 140CPS12420 is a redundant AC power supply for the Modicon Quantum automation platform. It accepts 115 VAC or 230 VAC input and converts the incoming supply to regulated 5.1 VDC for the Quantum backplane, supporting CPUs, local I/O, and communication modules.

The module can operate independently or as part of a redundant power-supply arrangement. In a redundant configuration, a second compatible power supply can maintain backplane power if one supply fails. Compatibility between power-supply models must be checked against Schneider’s Quantum power-supply matrix before installation.

140CPS12420

140CPS12420

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation — Approximately 10 Minutes

⚠️ Safety First: The 140CPS12420 is connected directly to hazardous AC voltage. Isolate the incoming supply and follow site lockout/tagout procedures before removing the module.

Tools Required:

• ESD wrist strap
• CAT-rated digital multimeter
• Appropriate screwdriver
• Wire labels
• Smartphone or camera
• Quantum power-supply documentation

Data Backup:

1. Record the installed 140CPS12420 part number.
2. Photograph the front panel and terminal wiring.
3. Record whether the rack operates with one or two power supplies.
4. Identify the incoming 115 VAC or 230 VAC supply.
5. Record the power-supply slot location.
6. Check for existing power-supply fault indications.
7. Document the Quantum rack load if changing the power-supply configuration.

Stage 2: Removing the Old Module — Approximately 5 Minutes

1. Confirm that the Quantum system is in an approved maintenance state.
2. Isolate and verify absence of AC voltage.
3. Apply ESD protection.
4. Photograph the 7-point terminal connector.
5. Label each incoming AC and alarm connection.
6. Disconnect the terminal block carefully.
7. Release the module retaining hardware.
8. Pull the power supply straight from the backplane.
9. Inspect the backplane connector for damage or contamination.
10. Retain the original module until commissioning is complete.

⚠️ Schneider’s installation documentation specifically warns that line power must be removed before inserting or removing this module.

Stage 3: Installing the New Module — Approximately 5 Minutes

1. Verify the replacement marking: 140CPS12420.
2. Confirm the replacement is intended for the Quantum rack.
3. Check the AC input voltage against the planned installation.
4. Inspect the terminal block and backplane connector.
5. Maintain ESD protection while handling the module.
6. Insert the module into the designated Quantum slot.
7. Ensure complete backplane engagement.
8. Secure the module.
9. Reconnect the AC wiring exactly as documented.
10. Reconnect the power-supply alarm connection where applicable.
11. Verify terminal tightness and conductor placement.

Self-Checklist:

• 140CPS12420 verified
• Input voltage confirmed
• Correct Quantum rack
• Terminal wiring documented
• Backplane connector inspected
• Module fully seated
• AC terminals secured
• Alarm connection checked

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

1. Confirm the installation is free of loose tools or conductors.
2. Verify the AC supply with a properly rated multimeter.
3. Restore incoming power.
4. Check the power-supply status indications.
5. Measure the appropriate backplane supply according to the service procedure.
6. Confirm the Quantum CPU starts normally.
7. Check local I/O and communication modules for faults.
8. Review the PLC diagnostic information.
9. If redundant, verify that both power supplies report the expected operating condition.
10. Record the replacement date and measured supply condition.

⚠️ Troubleshooting Note: If the Quantum rack does not start after replacement, check incoming AC voltage, fuse protection, terminal wiring, backplane seating, power-supply compatibility, and rack loading before replacing additional hardware.

Frequently Asked Questions (FAQ)

What is the Schneider 140CPS12420?

The 140CPS12420 is a Modicon Quantum redundant AC power supply module. It converts 115/230 VAC input into regulated 5.1 VDC power for the Quantum backplane.

What input voltage does the 140CPS12420 accept?

It supports 115 VAC from 93–138 VAC and 230 VAC from 170–276 VAC, at 47–63 Hz.

What is the output rating?

The module provides 5.1 VDC to the Quantum bus. Its maximum standalone bus current is 11 A at 60 °C. In a redundant configuration using two 140CPS12420 units, the documented total capacity is 10 A at 60 °C.

Can 140CPS12420 operate redundantly?

Yes. Schneider documentation identifies it as a redundant power supply and supports standalone or redundant operation. However, only documented compatible power-supply combinations should be installed together.

Can I hot-swap the 140CPS12420?

Do not treat it as a hot-swappable module. Schneider’s installation documentation explicitly states that line power must be removed before insertion or removal.

Is 140CPS12420 obsolete?

Yes. Schneider’s current product page lists the 140CPS12420 as discontinued/service-only. The U.S. Schneider page states a January 15, 2023 discontinuation date and an end-of-service date of December 31, 2030. Lifecycle dates can vary by Schneider regional site, so the local Schneider record should be checked for procurement planning.

What is the recommended replacement?

Schneider Electric identifies Modicon X80 BMXCPS4002 as the recommended replacement. It is a 100–240 VAC redundant power-supply module. This should be treated as a platform migration/replacement, not as an assumption of direct mechanical interchangeability with the Quantum module.

What should I verify before buying a replacement 140CPS12420?

Confirm the complete part number, input-voltage requirement, Quantum rack model, existing redundancy arrangement, terminal configuration, and physical condition. For a discontinued unit, specify whether the offered part is Factory Sealed, New Original/New Surplus, or Refurbished/Tested. Also request clear photographs of the nameplate before shipment.