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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
| 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.
