The Emerson Ovation 1C31194G03 valve positioner module is a key component of the Emerson Ovation control system, specifically designed for precise valve control in harsh industrial environments. It plays a core role in industries such as power, oil & gas, and chemical engineering. By converting control signals into accurate valve actions, it ensures the stable and efficient operation of industrial processes. This module features excellent compatibility, enabling it to work in tandem with various Emerson-owned devices and other third-party systems, providing reliable support for industrial automation.
Technical Specifications
(1) Input/Output Signals
Control Signal Input: Supports standard 4-20 mA current signal input to receive valve control commands from the control system.
Valve Position Feedback Input: Can interface with feedback signals from position sensors such as Linear Variable Differential Transformers (LVDT). The input range reaches up to 25 VAC peak-to-peak (for LVDT A and LVDT B). The input impedance is 20 kΩ (for LVDT A and LVDT B) in differential input mode with a floating source, and 10 kΩ (for LVDT A and LVDT B) when a single input line is referenced to the common terminal.
Output Signal: Converts control signals into precise pneumatic outputs to drive valve actuators, enabling accurate adjustment of valve position. It offers multiple output specifications to adapt to various types of servo valve coils based on different load requirements.
(2) Communication Interfaces
HART Communication Interface (if equipped): Used for module configuration, diagnostics, and data interaction with upper computers or other intelligent devices, facilitating remote monitoring and parameter adjustment of the valve positioner.
Serial Interfaces: Equipped with an RS-485 interface (baud rate 9600) for communication with other devices supporting the protocol, enabling data transmission and system integration; a local RS-232 interface (non-isolated, baud rate 19200) is also provided for on-site debugging and parameter setting by maintenance personnel.
(3) Electrical Characteristics
Operating Voltage: Typically 24 VDC, with a certain tolerance for voltage fluctuations to adapt to different industrial power supply environments.
Power Consumption: Low power consumption in normal operation to ensure efficient energy use and long-term stable system operation.
Key Features and Advantages of Emerson Ovation 1C31194G03
(1) Precise Drive and Control
The Emerson Ovation 1C31194G03 provides stable and specific voltage/frequency drive signals for LVDTs to ensure accurate position feedback. By flexibly matching with different individual modules (e.g., 1C31197G01/G02/G03/G04), it precisely adapts to various servo valve coils under different load requirements, achieving high-precision valve position control with industry-leading accuracy. This effectively reduces control errors, enhances industrial process stability, and improves product quality.
In complex industrial environments with fluctuating parameters like temperature and pressure, the 1C31194G03 automatically adjusts control strategies to maintain precise valve positioning, ensuring smooth production processes.
(2) Flexible Module Configuration
The 1C31194G03 can be integrated with multiple individual modules (1C31197G01, G02, G03, G04), allowing users to select suitable modules based on the impedance and quantity of servo valve coils in practical applications. This significantly enhances the module’s adaptability across diverse industrial scenarios and reduces system integration costs.
For example, pairing with 1C31197G01 optimizes drive performance for multiple low-impedance servo valve coils.
Using 1C31197G03 excels in high-impedance coil applications to ensure system efficiency.
(3) Reliable Insulation Performance
The 1C31194G03 features excellent insulation for field interfaces, SLIM interfaces, and trip digital inputs:
Field interfaces withstand 1000 VDC insulation testing; valve positioning field interfaces have short-term insulation of 50 V and 150 V from logic common/Ovation I/O buses.
SLIM interfaces offer ±1000 VDC insulation.
Trip digital inputs provide ±1000 VDC insulation.
This robust insulation enhances the module’s anti-interference capability in industrial environments, minimizing impacts from electromagnetic interference, ensuring system stability, reducing failure rates, and extending service life
Technical Parameters
(1) LVDT-related Parameters
Excitation Output: Provides 23.75 VAC peak-to-peak excitation voltage for LVDT with ±11% deviation; frequency is 3.0 kHz with ±10% deviation; minimum load impedance 500 Ω; maximum annual drift 0.5%. Ensures stable and accurate LVDT operation to provide reliable data for valve position feedback.
Position Feedback Input Range: Up to 25 VAC peak-to-peak (for LVDT A and LVDT B), meeting feedback signal input requirements of various LVDT sensors and adapting to different industrial application scenarios.
Position Feedback Input Impedance: 20 kΩ (for LVDT A and LVDT B) in differential input mode with floating source; 10 kΩ (for LVDT A and LVDT B) when a single input line references the common terminal. Guarantees signal input stability and accuracy, reducing signal interference and attenuation.
(2) Servo Valve Coil Output Parameters
Peak Voltage:
With 1C31197G01: Drives up to three 82 Ω coils at ±2.04 V.
With 1C31197G02: Drives up to three 250 Ω coils at ±4.20 V.
With 1C31197G03: Drives up to three 1000 Ω coils at ±8.26 V.
With 1C31197G04: Drives up to two 125 Ω coils at ±4.5 V.
These different output specifications meet driving requirements for various servo valve coils to achieve precise control of different valve types.
Output Voltage Accuracy: 0.4% of full-scale output, ensuring output voltage stability and accuracy to guarantee valve control precision and reliability.
(3) Other Parameters
Field Interface Insulation: 1000 VDC; valve positioning field interfaces have short-term insulation of 50 V and 150 V from logic common/Ovation I/O buses, effectively preventing electrical interference and leakage to ensure system safety.
SLIM Interface: RS-485 serial port at 9600 baud with ±1000 VDC insulation, suitable for long-distance data transmission and communication in industrial fields.
Local Serial Port: RS-232 (non-isolated) at 19200 baud, facilitating on-site debugging and parameter setting for maintenance personnel.
Trip Digital Input: Rated voltage 24 V/48 VDC (min. 18 VDC, max. 60 VDC); contact status change propagation delay: 1.9 ms (min.) – 25.5 ms (max.); maximum cable length 1000 ft (cable capacitance ≤50 pF/ft) with ±1000 VDC insulation. Ensures the module accurately receives and processes relevant signals under special conditions (e.g., trip), safeguarding system safety and reliability.
The Emerson Ovation 1C31194G03 valve positioner module is widely applied in the power industry (steam valve control in thermal power plants, coolant valve positioning in nuclear power plants), oil & gas industry (wellhead and pipeline valve control in oil extraction, process valve regulation in natural gas treatment plants), chemical industry (precise positioning of reactor and pipeline valves, control of material storage and transportation valves), as well as paper manufacturing, food & beverage industry, etc. It ensures the safe, stable and efficient operation of production processes and product quality in various industries through precise control of various valves.
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