Woodward Electronic Controls

    Electronic Controls for Steam Turbines and Compressors


    505CC-2 Integrated Turbine Compressor Control or Motor-Driven Compressor control

    Woodward’s integrated steam turbine/anti-surge compressor control is utilized on one/two stage compressors driven by a steam turbine or electric motor.

    The turbine control architecture is patterned after the popular 505 and 505E turbine controls and can be configured for single-valve or two-valve steam turbines. This controller’s anti-surge protection algorithms can be configured for one- or two-stage compressor loads, driven by a motor or turbine. The anti-surge control provides the user with a choice between two algorithms-the standard Woodward anti-surge algorithm or a special "minimum transducer" design that adapts to variable molecular weights.

    Learn more from the 505CC-2 product specification 


    Turbine Start-up/Shutdown

    • The 505CC-2 provides three selectable start-up modes—Manual, Semi-Auto, and Automatic. In full automatic mode, the 505CC-2 automatically ramps the steam control valve open at a user-defined rate until the 505CC-2 takes control of turbine speed at the programmed level.

    Speed Control

    • The integrated speed controller receives turbine speed signals from one or two magnetic pickups or proximity probes. The Speed PID compares the speed value against a speed reference setpoint to determine the correct turbine valve(s) position demand.

    Extraction/Admission Control

    • The Extr/Adm Control receives an extraction/admission pressure or flow signal. This signal is compared to a reference setpoint to generate a second turbine valve position demand. Since an extraction/admission turbine has two control valves, the valve position demands from the speed control and the extraction/admission control are fed through Ratio/Limiter software algorithm to establish the correct HP and LP valve positions.

    Performance Control

    • A variety of process control options is available. By using the unit’s cascade controller, a user can configure control of compressor suction or discharge pressure, flow, or any other process variable. The performance control compares a signal proportional to the controlled variable to a reference setpoint. Depending on the configuration that is selected, either the speed setpoint or the load demand signal will be modified to accomplish the desired control.

    Anti-Surge Control (Closed Loop)

    • An anti-surge PID receives pressure and flow signals (and temperature, depending on configuration) from the suction and discharge lines on the process compressor. These values are compared to the surge map for the specific compressor. When the computed control limit is exceeded, the output signal will cause the anti-surge valve to open so that the compressor flow is increased and surge is avoided. If the system upset is severe, a second rate-control PID is invoked to more quickly move the valve demand.


    • An Ethernet port on the 505CC-2 provides an interface to a site computer or optional 381 mm (15”) HMI running the 505CC-2’s Configuration and Commissioning Tool (CCT). This device allows the control to be configured to the specific needs of the current application. After configuration, the CCT can be used to tune, monitor, and control the 505CC-2. In addition, two RS-232/-422/-485 communication ports are available for connection to customer plant level control and DCS.

    Hardware Manual 26451
    Power Supply Rating 18–32 Vdc
    Power Consumption Less than 65 W

    Magnetic Pickup 100–24 950 Hz
    Proximity Probe 0.5–24 950 Hz
    Discrete Inputs 3 mA @ 24 Vdc, impedance 5.2 kΩ nominal
    Analog Inputs 4–20 mA
    Actuator Outputs 4–20 mA or 20–200 mA
    Analog Outputs 4–20 mA
    Discrete Outputs Powered by external +12 or +24 Vdc source, output current 200 mA maximum
    Communication Ports One Ethernet; Modbus YCP, UDP, Two RS-232, RS-422, or RS-485

    505CC-2 Control

    Ambient Operating
    Temperature Range –20 to +70 °C
    Storage Temperature Range –40 to +85 °C
    Vibration: Lloyds Test Specification No. 1, 2002, Vibration Test 1 (5–13.2 Hz, ±1 mm; 13.2–100 Hz, ±0.7 g)
    Shock: US MIL-STD-810C, 516.2-2 (30 g, 11 ms, 1/2 sine)
    Humidity 95% at +20 to +55 °C

    Optional HMI Touchscreen

    Ambient Operating Temperature Range –10 to +55 °C
    Shock 10 g peak acceleration (11 ms duration)

    North American:
        UL Listed for Class I, Division 2, Groups A, B, C, & D, T3C at 70 °C surrounding air temperature. For use in Canada and the United states. (UL File E156028)

    European Compliance for CE Marking:
        EMC Directive: 2004/108/EC
        Low Voltage Directive: 2006/95/EC
        ATEX Directive: 94/9/EC (Zone 2, Cat. 3, Group II G, Ex nA IIC T3 X)

    Marine Compliance:
        ABS: ABS Rules 2006 SVR 4-2-1/7.3, 7.5.1, 7.9.3/174-9-7/Table 9
        DNV: Standard No. 2.4, 2006: Temp. Class B, Hum. Class B, Vib. Class C, and EMC Class A
        LRS: Test Specification No. 1, 2002: ENV1, ENV2, and ENV3

    Optional Regulatory Compliance HMI

    North American UL Ordinary Locations