Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Input Voltage | 115V/230VAC (50/60Hz) |
| Input Voltage Range | 93-138VAC or 170-276VAC |
| Output Voltage | 24VDC |
| Max Output Current | 60A (Independent Mode) |
| Redundant Max Current | 16A per module |
| Rated Power | 1440W |
| Operating Temp | -25°C to +55°C |
| Efficiency | > 85% |
| Protection | Overvoltage, Overcurrent, Short Circuit |
| System Compatibility | Modicon Quantum Platform |
Product Introduction
Power supplies are usually the first thing to fail in a hot control cabinet, but the Schneider 140CPS12400 has a long track record of surviving where cheaper units melt. It sits in the Modicon Quantum chassis and acts as the primary 24VDC source for your CPU and I/O cards. I’ve seen these running in steel mills for over a decade without a single capacitor pop.
Engineers stick with this specific model because it pushes 1440W and handles a 60A load without dropping voltage during motor starts. The 1+1 redundancy feature actually works as advertised, keeping the backplane alive if one unit dies. Just be warned: this specific revision runs hot. Make sure your cabinet fans are pulling air, or you’ll be replacing thermal fuses at 2 AM.
Quality SOP & Tech Pitfalls (The Reality Check)
Before this 140CPS12400 leaves our bench, we don’t just look at it. We run a live load test on a Quantum test rack to verify it holds 24VDC under a 40A draw. We check input-to-output isolation with a Fluke 1507 insulation tester and verify the firmware date code matches our database. It gets sealed in fresh anti-static shielding with a printed test report showing the exact output ripple.
Here is where guys mess up: they swap this module without checking the input voltage jumper. If your site is 230VAC and the jumper is set to 115VAC, you will hear a loud pop and smell ozone. I watched a tech fry two of these in one afternoon because he assumed the jumper was correct. Always photograph the old module’s jumpers before pulling it. Also, watch out for counterfeit units; if the Schneider logo looks slightly blurry or the plastic is glossy instead of matte, send it back.
Schneider 140CPS12400
Installation & Configuration Guide
- Pre-Installation: ⚠️ LOCKOUT/TAGOUT THE MAIN BREAKER. Wait 5 minutes for internal capacitors to discharge. Take a high-resolution photo of the existing wiring and DIP switch/jumper positions.
- Removal: Label every wire with a Sharpie. Do not trust old tape. Release the top and bottom DIN clips using a flathead screwdriver. Pull the module straight out to avoid bending the backplane pins.
- Installation: COPY THE JUMPER SETTINGS EXACTLY. This prevents 90% of startup failures. Slide the new 140CPS12400 into the slot until the DIN clips click audibly. Reconnect wires according to your photo.
- Power-On & Testing: Close the breaker. Watch the “PWR” LED. It should illuminate solid green within 3 seconds. If it flashes or stays off, check your input voltage immediately. Verify 24VDC at the backplane test points with a multimeter before downloading logic.
Compatible Replacement Models
| Model | Compatibility Tier | Notes |
|---|---|---|
| 140CPS12420 | ⚠️ Software Compatible | Same form factor, but outputs 5.1VDC logic power. Requires chassis redesign. |
| 140CPS11420 | ⚠️ Software Compatible | Lower wattage rating. Verify your total backplane load before swapping. |
| 140CPS22400 | ❌ Hardware Mod Required | High-voltage variant. Different pinout. Do not use as direct drop-in. |
Schneider 140CPS12400
Frequently Asked Questions (FAQ)
Can I hot-swap this power supply while the PLC is running?
No. Absolutely not. While the Quantum backplane supports redundant power, physically pulling a live 140CPS12400 will arc the backplane pins. Always schedule a shutdown window.
Is this module brand new or refurbished?
We sell New Surplus. It is factory-sealed in original Schneider packaging but may have been sitting in a warehouse for a few years. We bench-test every single unit before shipping to guarantee it meets OEM specs.
Why does my 140CPS12400 keep tripping the input breaker?
You likely have a shorted I/O card on the backplane, or the inrush current is too high for your breaker size. Measure the backplane resistance with power off before installing a new power supply.
Does this support 24VDC input instead of AC?
No. The 140CPS12400 is strictly 115/230VAC. If you need 24VDC input, you are looking for a different model number. Check your OEM manual carefully.
What is the warranty on this obsolete part?
We provide a 1-year functional warranty. If it fails under normal operating conditions, we replace it. We don’t argue over “wear and tear” on industrial power supplies.
Can I mix this with a 140CPS11420 in redundancy mode?
Technically yes, but I wouldn’t recommend it. The load sharing won’t be perfectly balanced because their internal impedance differs. Stick to identical models for true 1+1 redundancy.
How do I know if the internal fan is dead?
This module is convection-cooled, so there is no fan to fail. However, if the metal casing is too hot to touch (>70°C), your cabinet ventilation is failing, not the module.
