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
Model
6ES5 955-3LC13 (PS955)
Input Voltage
115 VAC / 220 VAC (selectable)
Input Frequency
50 Hz
Output Current
18 Amp @ 5 VDC
Operating Temperature
0 to 60 deg C
Storage Temperature
-40 to 70 deg C
Relative Humidity
5% to 95% non-condensing
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.
