Description

The Siemens 6ES5955-3NF41, known as the PS 955 power supply module, is a high-capacity unit designed to provide regulated DC power to Simatic S5-135U and S5-155U central controllers, as well as EU 185U expansion units. This module is engineered for demanding industrial environments, including petrochemical processing, thermal power generation, and large-scale automotive manufacturing. It converts a 24 VDC input into a stable 40 A output at 5 VDC, ensuring consistent power for backplane logic, processors, and communication modules to prevent system resets and bus errors.

Features

• High-current step-down topology for efficient power conversion and thermal management.
• Provides 40 A of regulated 5 VDC power to the backplane bus.
• Integrated support for memory backup battery systems to maintain RAM states during power loss.
• Designed for seamless integration with S5-135U and S5-155U rack systems.
• Supports external battery assembly connections for extended memory retention.

Applications

This power supply is specifically intended for use in Siemens Simatic S5-135U and S5-155U PLC systems. It is suitable for mission-critical automation tasks where stable logic voltage is required to maintain continuous operation of complex control loops and high-speed manufacturing lines.

Technical Specifications

Installation Guidelines

• Ensure the rack power is disconnected before installing or removing the module to prevent electrical shock or damage to the backplane.
• The module requires proper alignment with the rack backplane bus to ensure even current distribution.
• Verify that the cooling paths are clear; this module relies on the system's forced-air cooling infrastructure to manage thermal loads.
• Ensure the backup battery assemblies are correctly seated in their designated holders and connected via the module's front-panel routing interfaces.
• Maintain adequate clearance around the module to allow for heat dissipation during operation.

FAQ

What is the primary function of the 6ES5955-3NF41?
This module acts as the primary power supply for Siemens Simatic S5-135U and S5-155U controllers, converting 24 VDC input to a 40 A, 5 VDC output for system logic.

Does this module handle memory backup?
Yes, it includes interfaces for external backup battery assemblies (such as the CA-6EW1000-7AA) to ensure RAM memory states are preserved during primary power failures.

Is this module compatible with other S5 series?
It is specifically designed for the S5-135U, S5-155U, and EU 185U expansion units. Please verify your specific rack configuration before installation.