Description
System Role and Integration
The 1C31219G01 serves as the intelligent logic interface within the Ovation Distributed Control System’s relay output architecture, functioning as the electronic “brain” that translates controller commands into physical relay actuation. Unlike standard I/O modules that mount directly to carriers, this electronics module plugs specifically into relay output base assemblies—either the 1C31223G01 (G2R configuration) or the 1C31222G01 (KUEP configuration)—to create a complete switching solution for high-power field devices. This modular separation of logic and power switching allows maintenance personnel to replace the electronics module without disturbing high-voltage field wiring, significantly reducing mean time to repair (MTTR) in critical power generation applications.
Core Functionality and Signal Handling
This module receives low-voltage logic signals from the Ovation controller node via the backplane interface and drives the coils of electromechanical relays mounted on the base assembly. It manages the discrete output channels—16 channels when paired with G2R bases or 12 channels when paired with KUEP bases—providing isolation between the sensitive controller electronics and the harsh electrical environment of the field.
A distinguishing diagnostic feature is the configurable blown fuse detection circuit, which monitors the health of external fuses protecting each relay circuit. When enabled, this functionality alerts operators to open-circuit conditions caused by overcurrent events, allowing proactive maintenance before control functionality is lost. The module operates from an 18V to 25.5V DC auxiliary supply, maintaining stable operation through power supply transients common in industrial substations.
Platform Heritage and Operational Benefits
As a core component of the Ovation platform now maintained within the Emerson automation portfolio, the 1C31219G01 benefits from decades of deployment in mission-critical power generation and heavy process industries. The module’s low power consumption—1.88W typical with a maximum of 2.5W—minimizes heat generation within densely packed control cabinets, reducing thermal stress on adjacent components and extending overall system life. The electronics module design philosophy allows plant personnel to stock a single electronics spare for multiple relay configurations (G2R or KUEP), optimizing spare parts inventory while maintaining coverage for diverse control requirements ranging from 16-channel low-current logic to 12-channel high-capacity power switching.
WESTINGHOUSE 1C31219G01
Part 4: Technical Specifications
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Model Number: 1C31219G01
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Manufacturer: Westinghouse Electric Corporation (Ovation product line)
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Product Type: Relay Output Electronics Module
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Compatible Relay Bases: 1C31222G01 (KUEP), 1C31223G01 (G2R)
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Number of Channels: 16 (G2R configuration) or 12 (KUEP configuration)
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Output Type: Electromechanical relay coil driver interface
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Blown Fuse Detection: Configurable per channel
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Operating Voltage Range: 18V DC to 25.5V DC
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Power Consumption (Main): 1.88W typical, 2.5W maximum
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Power Consumption (Auxiliary): 0.3W typical, 0.35W maximum
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Operating Temperature: 0°C to 60°C (32°F to 140°F)
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Storage Temperature: -40°C to 85°C (-40°F to 185°F)
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Humidity: 0% to 95% RH (non-condensing)
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Certifications: CE Mark compliant
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Dimensions: 12.1 cm × 2.5 cm × 10.2 cm (4.8 in × 1.0 in × 4.0 in)
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Weight: 0.18 kg (0.4 lbs)
Part 5: Core Features & Customer Value
Blown Fuse Detection and Diagnostics: The module’s configurable blown fuse detection capability provides continuous monitoring of external protective fuses, transmitting status information back to the Ovation controller when fuses clear due to overcurrent conditions. For maintenance engineers, this eliminates the need for manual fuse inspection rounds and enables predictive maintenance scheduling, reducing the risk of undiscovered control circuit failures during critical operations. The diagnostic functionality can be enabled or disabled per channel through software configuration, allowing customization based on application criticality.
Flexible Relay Base Compatibility: By supporting both G2R (16-channel) and KUEP (12-channel) relay bases, the 1C31219G01 offers procurement flexibility across different plant areas. A single electronics module spare inventory supports high-density logic applications using G2R bases as well as heavy-duty power switching applications utilizing KUEP bases rated for higher current and DC voltage switching. This compatibility reduces spare parts costs and simplifies stocking strategies for facilities managing diverse control requirements.
Power Efficiency and Thermal Management: With typical power consumption of only 1.88W, the module generates minimal heat compared to solid-state switching alternatives. In densely populated Ovation I/O cabinets common in power plant control rooms, this low thermal footprint reduces cooling system loads and prevents heat-related degradation of adjacent modules, contributing to extended system reliability and reduced HVAC operating costs.
Modular Maintenance Architecture: The separation of the electronics module from the relay base assembly allows technicians to replace the logic components without de-energizing field circuits or disturbing high-voltage terminations. During troubleshooting, this isolation enables rapid determination of whether faults reside in the logic electronics or the electromechanical relay components, significantly reducing diagnostic time and exposure to energized high-voltage circuits.
WESTINGHOUSE 1C31219G01
Part 6: Typical Applications
Fossil Fuel Power Plant Balance-of-Plant Control: The 1C31219G01 is extensively deployed in coal-fired and gas-fired generating stations for control of boiler feed pump auxiliaries, forced-draft fan motor contactors, and cooling tower fan starters. When paired with KUEP bases, the assembly handles the high inrush currents of large motor contactors directly, while the blown fuse detection capability alerts operators to auxiliary circuit failures before they impact unit availability.
Combined-Cycle Turbine Auxiliary Systems: In combined-cycle power blocks, this module controls fuel forwarding skid valves, lube oil pump starters, and hydrogen seal oil system auxiliaries. The G2R configuration (16 channels) supports the high point-density requirements of turbine auxiliary skids, while the module’s wide operating voltage range (18V–25.5V DC) accommodates the 125V DC battery-backed control systems common in turbine governor circuits.
Safety Instrumented Functions with Hardwired Logic: For safety-critical applications requiring electromechanical relay logic—such as turbine overspeed trip solenoids or main steam valve isolation—the module interfaces with KUEP Form X relay bases to provide fail-safe de-energize-to-trip functionality. The physical separation of the electronics module from the safety relays ensures that controller maintenance activities cannot inadvertently compromise the hardwired safety function.
Water Treatment and Demineralizer Systems: In demineralizer and reverse osmosis plants, the module controls backwash valve manifolds and chemical feed pumps. The blown fuse detection capability proves particularly valuable in these unattended facilities, providing remote notification of circuit failures to central control rooms and reducing the need for field technician dispatches to isolated equipment areas.
