KOKUSAI KOMS-A2

Description

Product Description

The KOKUSAI KOMS-A2 is a programmable, multi-loop process controller designed for precise measurement and control of temperature, pressure, flow, and other process variables. As a product of Kokusai Electric (now often associated with Azbil after corporate integrations), the KOKUSAI KOMS-A2 is a stand-alone digital controller that combines advanced control algorithms with a user-friendly interface. This model typically functions as a dedicated single or dual-loop controller, offering features like PID control with auto-tuning, programmable logic sequences, and multiple alarm outputs. For detailed technical specifications, operation manuals, and configuration software, the primary resource is the official Azbil (formerly Yamatake) documentation portal for the KOKUSAI KOMS-A2. Implementing the KOMS-A2 provides a reliable and compact solution for critical control loops in processes where a full-scale DCS or PLC is not required. Its design is tailored for easy integration into panel boards and offers robust performance for continuous industrial processes.

Product Parameters

• Manufacturer / Brand: Kokusai Electric / Azbil Group.
• Series: KOMS Series Digital Indicating Controller.
• Model: KOMS-A2.
• Control Loops: Typically a single-loop or dual-loop controller (specific to the A2 variant).
• Input Types: Accepts a wide range of analog inputs, including:
  • Thermocouples (J, K, R, S, B, etc.)
  • RTDs (Pt100, JPt100)
  • DC Voltage (mV, V)
  • DC Current (4-20mA)
• Output Types: Provides relay, voltage pulse, or current (4-20mA) outputs for control actions.
• Control Algorithm: Advanced PID control with features like auto-tuning, fuzzy logic, and cascade control capabilities.
• Display: Dual or multi-digit LED or LCD display for showing process variable (PV), setpoint (SV), and output value.
• Alarms: Multiple configurable alarm outputs (relay or transistor) for deviations, rate-of-change, or absolute limits.
• Communication: Often equipped with a serial communication port (RS-485 or RS-232C) for data transmission to a host system using protocols like Modbus.
• Power Supply: Operates on standard AC (100-240V AC) or DC (24V DC) power.
• Mounting: Designed for panel cutout mounting (DIN size).

Advantages and Features

• High Precision Control: Offers excellent control stability and accuracy for sensitive processes, utilizing advanced PID algorithms and auto-tuning to optimize loop performance.
• Versatile Input Compatibility: A single KOKUSAI KOMS-A2 model can be configured to accept a wide variety of sensor inputs, reducing inventory needs for different sensor types.
• Stand-Alone Reliability: Functions independently of a central PLC, providing dedicated control for critical loops, which enhances overall system reliability through decentralization.
• Intuitive Operation: Front-panel keys and a clear display allow for easy local configuration, setpoint adjustment, and monitoring without a PC.
• Communication Ready: The built-in serial port enables integration into SCADA or building management systems for centralized monitoring and data logging.

Application Cases in Industry

• Heat Treatment Furnaces: Precisely controls the ramp, soak, and cool-down temperature profiles in industrial ovens and furnaces for metal treatment.
• Plastic Injection Molding: Manages barrel and mold temperature zones to ensure consistent product quality and cycle times.
• Environmental Test Chambers: Regulates temperature and humidity within chambers used for product reliability testing.
• Packaging Machinery: Controls the temperature of sealing jaws on form-fill-seal machines to ensure perfect package integrity.
• HVAC Building Management: Serves as a dedicated controller for critical air handling unit (AHU) temperature loops or boiler control in larger facilities.

Comparison with Competing Products

Direct competitors include single-loop controllers from Omron (ESCK/ESCN), Yokogawa (UTAdvanced), and Fuji Electric (PXF/PXG). The KOKUSAI KOMS-A2 differentiates itself through its strong reputation for durability and precise control in demanding thermal process applications. Compared to a temperature module on a PLC, the KOMS-A2 offers a more specialized, out-of-the-box solution with a dedicated display and front-panel controls. Against other stand-alone controllers, it is often noted for its robust construction, intuitive parameter structure, and reliable performance, sometimes at a premium price point associated with the Azbil/Kokusai brand heritage.

Selection Suggestions and Precautions

• Selection Suggestions:
  1. Select the KOKUSAI KOMS-A2 for applications requiring dedicated, high-reliability control of a critical temperature or process loop, especially where local operator interface is important.
  2. Verify the exact input type (TC type, RTD, etc.) and output type (relay, SSR drive, current) required for your application match the controller’s specifications.
  3. If remote monitoring is needed, ensure the model variant includes the desired communication port (RS-485 Modbus is common).
• Precautions:
  1. Sensor Wiring: Use the correct compensation wire for thermocouples and ensure proper 3-wire connections for RTDs to avoid measurement errors. Maintain separation from power lines.
  2. Output Load Matching: When using relay outputs, ensure the electrical load (heater contactor, solenoid) does not exceed the relay’s rated current and voltage. For SSR drives, verify the output voltage/current matches the SSR’s input specifications.
  3. Auto-Tuning Conditions: Auto-tuning should be performed under stable process conditions representative of normal operation. Improper tuning can lead to poor control performance.
  4. Parameter Security: Once tuned and configured, use the controller’s password/lock function to prevent unauthorized changes to critical parameters.
  5. Firmware and Software: For models with communication, ensure you have the correct configuration software (if applicable) and understand the Modbus register map for data acquisition. Source the KOKUSAI KOMS-A2 from authorized distributors to ensure authenticity and access to technical support and documentation.

C98043-A1604-MFB SIEMENS
A1-116-100-502 SIEMENS
C98043-A7010-41 SIEMENS
C98043-A1206-L2 SIEMENS PLC
6RA2487-6DV00-0 SIEMENS PLC