ALSTOM AS111-1

Product Description

The ALSTOM AS111-1 is a fundamental power supply module within Alstom’s (now part of GE Vernova) industrial automation system portfolio, specifically designed for the Alspa range of PLCs and control systems. This module serves as the primary or auxiliary AC/DC Power Supply, converting incoming single-phase or three-phase AC mains voltage into a stable, regulated, and isolated DC voltage required to power the central processing unit (CPU), I/O modules, and other electronic components within the PLC rack. The reliable operation of the entire control system hinges on the quality of power delivered by the ALSTOM AS111-1.

Product Parameters

• Model: ALSTOM AS111-1.

• Function: PLC System Power Supply.

• Input Voltage: Typically designed for a standard AC input range (e.g., 100-240V AC, 50/60 Hz single-phase).

• Output Voltage: Provides a regulated DC output, most commonly 24V DC, which is the standard for PLC logic and sensor/actuator power.

• Output Current/Power: Rated for a specific continuous output current (e.g., 2A, 5A, 10A) or power (e.g., 60W, 120W) to support a defined load.

• Efficiency: High switching efficiency to minimize heat dissipation within the control cabinet.

• Protections: Integrated protections against overload, short circuit, and overvoltage. May include input surge suppression.

• Isolation: Reinforced isolation between the AC input and DC output for operator safety and system noise immunity.

• Mounting: Designed for direct mounting on a DIN rail within the PLC rack or enclosure.

• Diagnostic Indicators: LED indicators for power on (input) and output status.

Advantages and Features

• High Reliability and Stability: Provides exceptionally stable output voltage with low ripple, which is crucial for preventing erratic behavior or resets in sensitive digital control electronics.

• Robust Industrial Design: Built to withstand typical industrial power line disturbances, including voltage sags, surges, and electrical noise, ensuring uninterrupted control system operation.

• Compact and Integrated Solution: Delivers the exact power required by the Alspa PLC system in a compact form factor, saving panel space and simplifying wiring compared to generic power supplies.

• Optimized for PLC Loads: The output characteristics are matched to the inrush current demands and operational profile of PLC CPUs and digital/analog I/O modules, ensuring reliable start-up and operation.

• Safety Certified: Complies with international safety standards (e.g., UL, CE, cULus), making it suitable for use in control panels worldwide.

Application Cases in Relevant Fields

• Alspa PLC System Power Backbone: The ALSTOM AS111-1 is the designated power source for Alspa S20, S40, or other series PLC racks in applications ranging from water treatment plants to manufacturing assembly lines.

• Standalone Control Panel Power: Used in smaller control panels to provide clean 24V DC power not only for the PLC but also for ancillary devices like HMI screens, proximity sensors, and pilot lights.

• Distributed I/O Cabinet Power: Installed in remote or distributed I/O enclosures to provide local power for I/O modules and field instruments, eliminating long DC power cable runs from a central source.

• Retrofit and Modernization Projects: Serves as a direct replacement power supply for legacy Alspa systems during upgrades, ensuring compatibility and reliable operation of the modernized control system.

Comparisons with Competing Products

Compared to general-purpose 24V DC switching power supplies from manufacturers like Siemens (SITOP) or Phoenix Contact, the ALSTOM AS111-1 is a system-specific component.

• Guaranteed Compatibility and Fit: It is mechanically and electrically designed to integrate seamlessly with the Alspa PLC rack’s form factor and power distribution bus, ensuring a perfect physical and electrical connection that generic supplies may not provide.

• Simplified System Design and Sourcing: Using the OEM-recommended ALSTOM AS111-1 simplifies the bill of materials, ensures single-vendor support for the core system components, and avoids potential compatibility or derating issues.

• Potential for Enhanced System Diagnostics: In some system configurations, the status of an OEM power supply like the ALSTOM AS111-1 can be more easily integrated into the PLC’s diagnostic framework for centralized monitoring. For a guaranteed fit and performance within an Alspa system, the authentic ALSTOM AS111-1 is the recommended choice.

Selection Suggestions and Precautions

1. Accurately Calculate Total DC Load: Sum the current consumption of the CPU, all I/O modules, and any other devices (e.g., relays, indicators) powered from the ALSTOM AS111-1. Select a model with an output current rating that exceeds this total by at least 20-30% for a safety margin and longevity.

2. Verify Input Voltage Compatibility: Confirm that the AC input voltage range of the ALSTOM AS111-1 matches your local mains supply (e.g., 120V AC vs. 230V AC). Using an incorrect input voltage will damage the unit.

3. Check Physical Dimensions and Mounting: Ensure the module fits within the available space in your PLC rack or enclosure and that its mounting method (DIN-rail) is compatible.

4. Source from Authorized Automation Distributors: Purchase from GE Vernova authorized distributors or certified automation parts suppliers. Counterfeit power supplies are common and pose serious fire and safety risks due to substandard components.

5. Ensure Proper Cooling and Derating: Install the power supply with adequate clearance for ventilation. Note that its maximum output current may be derated at high ambient temperatures; consult the datasheet for derating curves.

6. Implement Primary Input Protection: Always protect the AC input line with a properly sized fuse or circuit breaker according to local electrical codes and the manufacturer’s instructions. Ensure the control panel is correctly grounded.