2301E-ST Steam Turbine Control for Small Generator Applications

    Drop-in replacement for the popular 2301D-ST controller


     2301E-ST Ordinary Location Chassis            2301E-ST Hazardous Location Chassis

         Ordinary Location Package                  Hazardous Location Package

    The 2301E-ST controller is equipped with internal algorithms designed to start/stop, control, and protect small steam turbines driving generators, pumps, and compressors. In addition to all the features of the standard 2301E control, the ST version has redundant speed inputs and three turbine starting modes.

    The 2301E-ST performs the core control and protection functions of a small steam turbine package. The application software is field configurable, allowing it to be configured and modified to meet site-specific requirements. Modbus communications also allow easy interface with a package PLC or plant DCS.

    The controller's integrated generator power sensor and load-sharing capabilities also make it ideal for small turbine generator sets where a cost-effective control solution is essential

    It can be ordered with a hazardous location chassis (p/n 8273-1014) or an ordinary location chassis (p/n 8273-1013).

    The 2301E-ST controller is backward compatible with existing 2301D-ST controllers since it has the same form, fit, and function. The new controller insures the ongoing availability of a proven, versatile product with enhanced features:

    • Accepts two redundant MPU speed signal inputs
    • Separate RS-232 and RS-422 serial ports, both with 9-pin connectors
    • Additional status LEDs for power and RS-422 communications
    • Fault data logging capability with 16 seconds of data collected every 10 milliseconds on the event of a shutdown, peak speed and load detection
    • Low-current PWM output for driving Woodward’s L-Series, F-Series, P-Series and PISC actuators
    • New terminal blocks accommodate additional I/O, with a majority of the terminals located in the same position as the 2301D-ST models.
    • Major compliance certifications

    The 2301E-ST has four operating modes:

    Speed Control

    Has multiple dynamics flexibility. Will work on pumps or compressors. Has capability for remote 4–20 mA speed reference through a configurable analog input.

    Isochronous Load Sharing

    Is compatible with most existing analog load sharing speed control systems. Now with soft load and unload capability.

    Droop Base Load

    Adjustable load control using discrete raise and lower contact

    Isochronous Base Load

    Provides constant load level operation against a utility bus. The load setting may be fixed orchanged using discrete raise and lower inputs or a remote 4–20 mA input.

    Key features of the 2301E-ST controller include:

    • Engine / generator or pump applications
    • Multiple dynamics
    • Manifold Air Pressure (MAP) limiter
    • Torque limiter
    • Low-speed sensing functionality
    • Remote speed and load reference
    • Soft load transfer
    • Automatic idle-to-rated switching
    • Load rejection / load pulse option
    • Idle droop function
    • Optional Modbus® serial communications
    • Adaptive speed sensing algorithm
    • Two serial ports
    • Data-logging capability
    • 2301E ToolKit service tool or Control Assistant programmable [Note that the technical manual is embedded in the Service Tool]
    • Ordinary or hazardous location chassis

     ® Modbus is a trademark of Schneider Automation Inc.



    Power Supply Rating

    18–36 Vdc (SELV)

    Power Consumption

    Less than or equal 20 W nominal

    Maximum Altitude

    3000 m / 10 000 feet

    Input Supply Voltage /  
    Typical Input Supply Current

    18 V / 589 mA

    24 V (nominal) 431 mA

    32 V / 319.6 mA

    Inrush Current

    7 A for 0.1 ms

    Steady State Speed Band

    ±0.25% of rated speed

    Magnetic Pickups

    100–25 000 Hz (300–3600 rpm)

    3-Phase Current Transformer

    3-7 A rms at full load, CT input burden at full load is 0.1 VA per phase

    3-Phase PT Burden

    100–240 Vac line-to-line, 50–400 Hz. PT input burden is between 1.5 VA and 1.7 VA per phase at 240 Vac, and between 0.4 VA and 0.5 VA per phase at 120 Vac.

    Discrete Inputs (8)

    3 mA at 24 Vdc, impedance approximately 5.2 kA

    Remote Reference Input

    4–20 mA, 1–5 Vdc

    SPM-A Input

    ±2.5 Vdc, externally powered

    Analog Output #1

    0–20 mA, 4–20 or 0–200 mA to actuator, software configurable

    Analog Output #2

    0–20 or 4–20 mA, internally powered, configurable, power by external +12 Vdc or +24 Vdc source, max output current 200 mA

    Discrete Output Ratings

    Low-side drivers with overvoltage protection, 200 mA maximum

    Communication Ports

    RS-232: Service Tool port, 9-pin connector;
    RS-422: Modbus Com port, 9-pin connector, 9600 to 115 200 baud, full duplex

    Ambient Operating Temperature

    –40 to +70 °C (–40 to +158 °F)

    Storage Temperature

    –40 to +105 °C (–40 to +221 °F)


    Lloyd’s Register of Shipping, Test Specification No. 1, 1996, Humidity Test 1, 95% at +20 to +55 °C (+68 to +131 °F) condensing

    Mechanical Shock

    US MIL-STD 810C, Method 516.2, Procedure I (basic design test), Procedure II (transit drop test, packaged), Procedure V (bench handling)

    Equipment Classification

    Class 1 (grounded equipment)

    EMC Immunity Environment

    Marine Type Tests & EN 61000-6-2
    IEC 61000-4-2, ESD ±6 kV/±8 kV
    IEC 61000-4-3, RS 10V/m + AM 80-3000 MHz
    IEC 61000-4-4, EFT ±2 kV Power & I/O
    IEC 61000-4-5, Surge ±1 kV I/O CM, ±0.5/±1.0 kV dc power
    DM/CM, & ±1.0/±2.0 kV ac power DM/CM
    IEC 61000-4-6, CRF 10 VRMS + AM 0.150-80 MHz
    Marine Type Test CLFI 3.6 VRMS or 2W, 50 Hz to 20 kHz
    WWD (Marine) CLFI 3.6-0.36 VRMS or 2.0–0.2 W, 20 kHz to 150 kHz. 

    EMC Emission Environment

    Marine Type Tests & EN 61000-6-4
    Marine General Distribution Zone per CISPR 16
    EC EN 61000-6-4 Industrial Limits (Class A)