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Description
The Siemens 6ES5955-5LB11 is a robust power supply unit specifically designed for the Simatic S5-135U and S5-155U programmable logic controller systems. This module serves as a critical component in the automation rack, converting standard AC input into stable DC power required for the reliable operation of CPUs and I/O modules. It is engineered to maintain system integrity in demanding industrial environments, ensuring that control logic remains powered even when subjected to fluctuating grid conditions.
Features
- Selectable input voltage range for 115 VAC or 230 VAC operation.
- Dual output rails providing 5 VDC and 24 VDC for system backplane requirements.
- Integrated protection circuits against short-circuits and overvoltage conditions to prevent damage to downstream modules.
- Front-mounted LED indicators for immediate monitoring of power status and output regulation health.
- Designed for natural convection cooling, eliminating the need for external fans.
Applications
This power supply is widely deployed in legacy Siemens S5 automation architectures. Typical applications include heavy manufacturing, petrochemical processing units, and large-scale infrastructure control systems where high availability and consistent DC power are essential for continuous production.
Technical Specifications
| Model |
6ES5955-5LB11 |
| Brand |
Siemens |
| Input Voltage |
115/230 VAC selectable |
| Frequency Range |
47 to 63 Hz |
| Output Voltage |
5 VDC and 24 VDC |
| Output Current (5 VDC) |
10 A |
| Operating Temperature |
0 to 60 deg C |
| Storage Temperature |
-40 to 70 deg C |
| Cooling |
Natural convection |
Installation Guidelines
- Ensure the input voltage selector switch is correctly set to match your facility's supply voltage before powering on.
- Installation must be performed by qualified personnel with the system power disconnected.
- Verify that the ventilation slots are unobstructed to allow for effective natural convection cooling.
- Mount the module securely in the designated S5 rack position, ensuring all backplane connectors are fully seated.
- Maintain proper grounding practices to minimize the impact of electrical noise on the control system.
FAQ
Q: Is this power supply compatible with S5-115U systems?
A: No, the 6ES5955-5LB11 is specifically designed for the S5-135U and S5-155U platforms. Please verify your rack series before installation.
Q: How do I select the input voltage?
A: The unit features a voltage selector switch on the housing. Ensure this is configured for your local power grid (115V or 230V) prior to installation.
