DSPC174 Power Supply | Triconex Safety Controller

Description

• DSPC174: Product Overview

  The DSPC174 is a critical power supply module designed specifically for ABB’s Triconex Safety Instrumented System (SIS) platform. This module is installed in a Triconex chassis and serves as the primary power conversion unit, transforming an external AC or DC input voltage into the stable, isolated DC power required by the TMR processor and I/O modules. In a typical Triconex system, three power supply modules are installed to create a triple redundant power architecture, ensuring that a single power supply failure cannot compromise the safety system’s operation.

  The module’s design incorporates independent power conversion circuits and comprehensive monitoring capabilities. It provides multiple output voltages, including the primary 5V DC logic power for the main chassis backplane and 24V DC for field I/O circuits. Each power supply operates independently, with the system employing a voting mechanism to ensure continuous power delivery even if one or two supplies fail. This redundancy is fundamental to achieving the high availability and fault tolerance required for Safety Integrity Level (SIL) 3 applications.

  

  DSPC174

  DSPC174: Technical Specifications

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    Model Number:​ DSPC174
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    Order Number:​ 3BSE005461R1
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    Manufacturer:​ ABB (Triconex)
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    Product Type:​ Power Supply Module
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    Input Voltage:​ 120/240 VAC, 50/60 Hz or 125 VDC
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    Output Voltages:​ +5 VDC (logic power), +24 VDC (field I/O power)
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    Output Power:​ 200 Watts total
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    Redundancy:​ Triple Modular Redundant (TMR) configuration
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    Efficiency:​ >75%
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    Hot-Swap Capable:​ Yes
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    Status Indicators:​ LED indicators for power good, fault, and AC power present
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    Isolation:​ 1500 VAC input to output, 500 VAC output to chassis
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    Overvoltage Protection:​ Yes, on all outputs
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    Overcurrent Protection:​ Yes, current limiting with auto-recovery
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    Operating Temperature:​ 0°C to 60°C (32°F to 140°F)
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    Safety Standards:​ UL 508, CSA 22.2, IEC 61131-2

    

    DSPC174

  Core Features & Customer Value

  The triple redundant design is the module’s most critical feature, providing fault-tolerant power to the safety system. In a typical installation, three power supplies share the load equally. If one supply fails, the remaining two automatically assume the full load without interruption. This architecture ensures continuous system operation through maintenance periods, significantly enhancing overall system availability and reducing the risk of spurious trips due to power supply issues.

  Hot-swappable capability allows for the replacement of a faulty power supply without shutting down the Triconex controller or de-energizing the field I/O. Maintenance personnel can remove and replace a module while the system remains operational, which is essential for processes requiring continuous operation. This feature minimizes downtime during maintenance activities and allows for proactive power supply replacement during planned maintenance windows.

  The comprehensive diagnostic capabilities, including status LEDs and internal monitoring circuits, provide immediate visual indication of module health. The system controller can monitor each power supply’s status and report faults to the control room, enabling predictive maintenance. This advanced warning allows planning for replacement during scheduled outages rather than reacting to unexpected failures.

  Typical Applications

  In critical process industries such as offshore oil and gas platforms, the DSPC174 provides redundant power to Emergency Shutdown Systems (ESD). The triple redundancy ensures that even with a power supply failure, the ESD system remains fully operational to perform safety functions during emergency situations.

  In nuclear power plant safety systems, these power supplies provide reliable power to reactor protection systems. The redundant design and high reliability meet the rigorous safety standards required in nuclear applications, where power supply failure could have severe consequences.