Description

The 6ES5 955-3LC13 (PS955) power supply module is engineered to provide stable, regulated electrical power for Siemens Simatic S5-135U and S5-155U central controller racks and expansion chassis. This robust unit is designed for demanding industrial environments, ensuring consistent operation of backplane electronics, logic processing modules, and I/O bus interfaces by converting AC mains into reliable DC power.

Features

• Selectable input voltage range: 115 VAC or 220 VAC at 50 Hz.
• Regulated output: 18 Amp at 5 VDC for backplane and logic power.
• Integrated battery backup support using the CA-6EW1000-7AA lithium battery to maintain RAM and real-time clock data during power loss.
• Comprehensive protection features including overvoltage protection, short-circuit current limiting, and galvanic isolation.
• Front-panel LED diagnostics for monitoring AC input and DC rail status.
• Passive cooling design with thermal cutoff protection for sustained reliability.

Applications

This power supply is a critical component for legacy Simatic S5 automation systems, commonly utilized in continuous process industries such as petroleum refineries, thermal power generation, metallurgical processing, and large-scale mining operations.

Technical Specifications

Installation Guidelines

• Ensure the rack is fully powered down before inserting or removing the power supply module.
• Verify the input voltage selector switch matches the local AC supply (115V or 220V) before energizing.
• Ensure proper seating in the S5 rack backplane to maintain electrical contact and structural stability.
• Maintain adequate clearance around the module to allow for passive cooling airflow.
• Handle with care to prevent electrostatic discharge (ESD) damage to internal circuitry.
• Regularly inspect the backup battery (CA-6EW1000-7AA) and replace according to the maintenance schedule to prevent data loss.

FAQ

Is this unit compatible with all S5 racks?

The 6ES5 955-3LC13 is specifically designed for the Simatic S5-135U and S5-155U series. Please verify your rack model and current requirements before installation.

What is the purpose of the battery compartment?

The front-accessible compartment holds a lithium battery to provide backup power for the CPU RAM and internal real-time clock, ensuring memory retention during main power outages.