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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 series. This module serves as the primary energy source for the system backplane, ensuring stable DC voltage distribution to CPUs and I/O modules in demanding industrial environments. By providing consistent power regulation, this unit helps maintain system integrity in critical applications such as chemical processing, power generation, and large-scale manufacturing automation.

Features

  • Designed for seamless integration with Siemens Simatic S5-135U and S5-155U rack systems.
  • Selectable input voltage range (115 VAC or 230 VAC) for flexible installation across global power grids.
  • Integrated protection circuitry guarding against overvoltage and short-circuit conditions to prevent damage to downstream components.
  • Front-mounted diagnostic LEDs for immediate visual monitoring of power status and output health.
  • Engineered for reliable operation in high-noise electrical environments typical of heavy industrial facilities.

Technical Specifications

Model 6ES5 955-5LB11
Input Voltage 115 VAC / 230 VAC (selectable)
Input Frequency 47 to 63 Hz
Output Voltage 5 VDC / 24 VDC
Output Current (5 VDC) 10 A
Operating Temperature 0 to 60 deg C
Storage Temperature -40 to 70 deg C
Cooling Method Natural convection

Installation Guidelines

  • Ensure the rack power is disconnected before installing or removing the module to prevent electrical shock or damage to the backplane pins.
  • Verify that the voltage selection switch is set correctly for your local supply (115V or 230V) before applying power.
  • Maintain adequate clearance around the module to allow for natural convection cooling; avoid mounting in areas with excessive dust or high humidity.
  • Use appropriate industrial-grade wiring for input connections and ensure all terminal screws are tightened to the specified torque to prevent loose connections.
  • Always handle sensitive electronic modules using proper ESD (Electrostatic Discharge) precautions to protect internal circuitry.

FAQ

Is the 6ES5955-5LB11 compatible with S5-115U systems?
This specific power supply is designed for the S5-135U and S5-155U platforms. Please check your specific rack hardware requirements before installation.

Does this module require external cooling fans?
No, the unit is designed for natural convection cooling. Ensure the installation environment allows for unobstructed airflow around the module vents.

How do I change the input voltage?
The module features a selectable input voltage setting. Please refer to the physical switch or jumper configuration on the unit, ensuring the input matches your facility's power supply before activation.

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