ABB DSSR120 Power Supply Module

Description

ABB DSSR120 Power Supply Module

The ABB DSSR120 is a specialized Reference Voltage Unit (also referred to as a Re-settable Overvoltage Monitor or Voltage Reference Module) used primarily within the ABB MasterView and Advant Controller (AC450/AC410) systems. It is part of the S600 I/O family and plays a critical role in maintaining signal integrity and reference stability for analog I/O systems.

Product Detailed Description

The DSSR120 is designed to provide highly stable reference voltages for analog-to-digital and digital-to-analog conversion processes within a rack-mounted controller environment. It ensures that measurement signals remain accurate regardless of temperature fluctuations or aging of other system components. In many configurations, it also acts as a monitoring device to detect and signal overvoltage conditions that could potentially damage sensitive I/O cards.

Technical Parameters

Product Advantages

• High Precision: Provides an extremely stable \pm 10 V reference, which is the “gold standard” for industrial analog signals, ensuring high-fidelity data acquisition.
• Thermal Stability: Engineered with low-drift components to maintain accuracy across the full industrial temperature range of the control cabinet.
• System Protection: Includes monitoring circuitry that can trigger system alarms if the reference voltage deviates beyond pre-set tolerances, preventing “silent” measurement errors.
• Hot-Repair Support: Designed to be replaced in a live system (within a redundant architecture) without requiring a complete system reboot, maximizing uptime.

Important Considerations & Precautions

• Slot Placement: The DSSR120 must be placed in a specific designated slot in the subrack (usually defined by the bus backplane) to correctly distribute the reference voltage to adjacent I/O modules.
• Calibration Check: While the unit is factory-calibrated, it is a “reference” device. It should be verified during major system audits using a high-precision digital multimeter (at least 5.5 or 6.5 digits).
• Load Limits: Do not attempt to use the reference outputs to power external field devices. It is designed only to provide a voltage reference for high-impedance inputs within the rack.
• ESD Sensitivity: Like all Advant S600 modules, the DSSR120 is sensitive to electrostatic discharge. Always use an ESD wrist strap when handling the card.

Product Applications

The DSSR120 is essential in high-stakes process control environments:

• Power Generation: Used in turbine control systems where precise analog measurements of speed, vibration, and temperature are critical for safety.
• Metals & Mining: Ensuring accurate tension and speed control in rolling mills where \pm 10 V analog signals are used for drive synchronization.
• Chemical Processing: Providing the reference for high-accuracy flow and pressure loops in large-scale reactor control.
• Legacy System Maintenance: Frequently used as a direct replacement part for maintaining the reliability of aging ABB MasterPiece 200/280 installations.

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