GE DS200TCPDG2B
GE DS200TCPDG2B - Image 2

GE DS200TCPDG2B

  • Product Overview: The DS200TCPDG2B is a dual-channel temperature control board for GE Mark V and Mark VI speedtronic control systems. It provides precise PID temperature control for two independent temperature loops, typically used for steam temperature control, bearing temperature regulation, and oil temperature management in turbine and generator applications. Each channel accepts thermocouple or RTD inputs and drives a control output to a final control element.
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Category: SKU: GE DS200TCPDG2B

Description

GE DS200TCPDG2B

  • Technical Specifications:
    • Channels: 2 independent PID temperature control channels
    • Input Types: Thermocouple (J, K, T, E, N, S, R, B); RTD (Pt100, Pt1000, Cu50, Ni120)
    • Input Resolution: 16-bit A/D converter
    • Temperature Range: -200°C to +1800°C (depending on sensor type)
    • Control Output: 4–20 mA (to control valve or damper actuator)
    • Control Algorithm: PID with auto-tuning, adaptive gain, and bumpless transfer
    • Sampling Rate: 10 samples per second per channel
    • Accuracy: ±0.5°C (thermocouple); ±0.2°C (RTD)
    • Isolation: 500 VDC channel-to-channel; 500 VDC channel-to-logic
    • Power Consumption: 3.5 W typical
    • Diagnostics: Per-channel LED; sensor fault detection (open, short, out-of-range); output fault detection
  • Functional Features:
    • Auto-Tuning: Built-in relay feedback auto-tuning (Zeigler-Nichols method) that automatically calculates optimal PID parameters; also supports manual PID entry
    • Bumpless Transfer: When switching between manual and automatic modes, the output tracks the manual setpoint to avoid a sudden step change in the control valve
    • Cascade Control: Channel B can be configured as a cascade slave to Channel A (e.g., Channel A controls main steam temperature, Channel B controls attemperator water flow as the inner loop)
    • Alarm Limits: High-high, high, low, and low-low alarm setpoints per channel with configurable delay timers to prevent nuisance alarms
    • Sensor Break Detection: Automatic detection of thermocouple wire break (open circuit) and RTD lead wire break; generates a diagnostic alarm
    • Cold Junction Compensation: Built-in for thermocouple inputs with ±0.5°C accuracy
  • Application Scenarios:
    • Steam Turbines: Main steam temperature control (attemperator water valve); reheat steam temperature control; bearing journal temperature regulation (oil cooler valve)
    • Gas Turbines: Exhaust gas temperature monitoring; compressor discharge temperature control; lube oil temperature regulation
    • Generators: Stator winding temperature monitoring (RTD); rotor winding temperature monitoring (thermocouple); hydrogen cooler temperature control
    • Industrial Process: Reactor temperature control; dryer temperature control; heat exchanger outlet temperature regulation
    • HVAC: Chilled water temperature control; hot water boiler temperature regulation
  • Performance Parameters:
    • Operating Temperature: 0°C to 60°C
    • Storage Temperature: -40°C to 85°C
    • Relative Humidity: 5% to 95% non-condensing
    • MTBF: Greater than 190,000 hours
    • EMC Compliance: IEC 61000-6-2, IEC 61000-6-4
  • Material & Structure:
    • Form Factor: Mark V/VI standard, approximately 170 mm × 100 mm × 25 mm
    • Connectors: 28-pin backplane connector; 2 × 16-pin field terminal blocks (one per channel) on top
    • PCB: 6-layer FR-4 with conformal coating and shielded analog sections
    • Enclosure: Zinc-plated steel with EMI shielding can
    • Weight: Approximately 340 grams
    • Front Panel: 4 green LEDs per channel (power, run, alarm, fault); 1 amber system fault LED; 1 green power LED
  • Working Principle:
    • The temperature sensor signal is conditioned by a dedicated ASIC that performs cold junction compensation (for thermocouples), linearization, and 16-bit A/D conversion. The digital temperature value is compared to the setpoint, and the error is processed by a PID controller. The PID output is converted to a 4–20 mA signal by a 12-bit D/A converter and a voltage-to-current converter. The auto-tuning function injects a relay oscillation into the control loop, measures the resulting oscillation period and amplitude, and calculates the PID parameters using the Zeigler-Nichols formulas. The cascade control feature allows Channel B’s setpoint to be driven by Channel A’s output, creating a two-loop control system.
  • Installation Requirements:
    • Rack: Mark V or Mark VI I/O rack
    • Thermocouple Wiring: Use thermocouple extension wire of the same type as the sensor; do not use copper wire; keep cable runs under 100 meters
    • RTD Wiring: Use 3-wire or 4-wire configuration; the board supports both; 4-wire is recommended for highest accuracy
    • Control Output: Connect the 4–20 mA output to the valve positioner or actuator; ensure loop resistance does not exceed 600 ohms
    • Grounding: Connect shield to chassis ground at the control system end only
  • Usage Notes:
    • Auto-Tuning: Before running auto-tune, ensure the control valve is fully operational and the process is at steady state; auto-tuning will cause temporary oscillations
    • Cascade Setup: When using cascade control, set Channel A as the master and Channel B as the slave; configure Channel B’s setpoint source to “Cascade from Channel A”
    • Alarm Delay: Set alarm delay timers to at least 5 seconds to prevent nuisance alarms from sensor noise or transient temperature spikes
    • Sensor Matching: Do not mix thermocouple types on the same channel; each channel must use a single thermocouple type
    • Calibration: Calibrate each channel using a precision temperature simulator; verify accuracy at 0%, 25%, 50%, 75%, and 100% of the temperature range

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