The Siemens PS 950 (6ES5950-3AA51) is a specialized power supply module engineered for the Simatic S5-135U and S5-155U automation systems. This unit provides reliable, regulated DC power to the PLC backplane, ensuring stable operation of the CPU and associated I/O modules. Designed for demanding industrial environments, the PS 950 effectively manages line fluctuations and provides robust protection against electrical disturbances, which is critical for maintaining process continuity in manufacturing and power generation applications.
Features
Designed for seamless integration with S5-135U and S5-155U chassis architectures.
Selectable input voltage range (120 VAC / 230 VAC) for global compatibility.
Integrated overvoltage protection (OVP) with electronic crowbar circuitry to safeguard backplane components.
Passive cooling design utilizing high-efficiency heat sinks to eliminate reliance on mechanical fans.
Front-panel LED indicators for real-time monitoring of input power and secondary output status.
Technical Specifications
Model
6ES5950-3AA51
Input Voltage
120 VAC / 230 VAC (selectable)
Frequency
50-60 Hz
Output Voltages
5 VDC, 24 VDC
Max Output Current
10 A at 5 VDC
Max Power Capacity
120 W
Operating Temperature
0 to 60 deg C
Storage Temperature
-40 to 70 deg C
Cooling Method
Natural convection
Installation Guidelines
Ensure the PLC rack is powered down before inserting or removing the PS 950 module.
Verify that the input voltage selector switch matches the local supply voltage before applying power.
Install in a location that allows for adequate vertical clearance to facilitate natural convection cooling.
Ensure the module is fully seated in the dedicated S5 rack slot and secured to prevent vibration-induced disconnection.
Maintain a clean environment to prevent dust accumulation on the heat sinks, which could impede thermal dissipation.
FAQ
Is this module compatible with S5-115U systems? No, the PS 950 is specifically designed for the S5-135U and S5-155U rack systems. It is not physically or electrically compatible with the S5-115U series.
Does this unit require external cooling fans? No, the PS 950 utilizes a passive cooling design with integrated heat sinks. It is designed to operate via natural convection, provided the installation guidelines regarding clearance are followed.
