Woodward Electronic Controls
Electronic Controls for Steam Turbines
2301D-ST Digital Load Sharing and Speed Control for Steam Turbines
Woodward’s 2301D-ST configurable control performs the core load sharing and speed control functions of small steam turbines. The application software is field configurable, allowing it to be modified to meet site-specific requirements.
Like Woodward's 2301A line of controls, this control is housed in a sheet-metal chassis and consists of a single printed circuit board. To facilitate unit retrofits, the 2301D-ST's I/O terminals are located in the same general location as Woodward's 2301A line of controls.
Learn more from the 2301D-ST product specification
Power Supply Rating
Magnetic Pickup: 100–24,950 Hz
Discrete Inputs (8)
- 3 mA at 24 Vdc, impedance approximately 5.2 k
Analog Inputs (2)
- 4–20 or 20–200 mA to actuator, software configurable
- 4–20 mA, internally powered
Discrete Outputs (4)
- configurable relay drivers, powered by external +12 or +24 Vdc source, max output current 200 mA
- RS-232, 9-pin connector, 1200 to 38,400 baud, full duplex
Ambient Operating Temperature
- –40 to +70 °C (–40 to +158 °F)
The Woodward 2301D-ST controls a wide variety of single-valve steam turbines used in electrical generator, compressor drive, or pump applications.
- The 2301D-ST provides configurable turbine start-up scheduling via a Valve Ramp. On start-up, the turbine accelerates according to the Valve Ramp schedule until the speed control loop takes control of the turbine. The valve ramp can also be used to shutdown the turbine.
- When configured for generator drive applications, the 2301D-ST can operate in either an isochronous or droop load mode. In the "Isoch" mode, the 2301D-ST controls plant/unit frequency control by maintaining turbine speed. In the "Droop" mode the 2301DST controls generator load. If the generator is connected to the utility bus while in droop mode, the unit speed will be determined entirely by the bus frequency. If the generator is disconnected from the utility bus, the unit speed will “droop” as the load increases.
- Optionally the 2301D-ST can be configured to accept a ±3 Vdc synchronizing signal. This input is compatible with and intended to be used in conjunction with Woodward’s SPM-A synchronizers.
Critical Speed Avoidance
- The 2301D-ST can be configured to provide one speed range to be avoided for turbine protection. Under normal circumstances, the turbine speed setpoint will rapidly ramp through the critical speed range.
Remote Speed Setpoint
- One of the analog inputs can be configured to remotely control the speed setpoint. The maximum rate at which the speed setpoint can be changed by the remote input is configurable by the user. The remote speed setpoint is enabled and disabled from a contact input or Modbus communications.
- A process control can be configured to receive a remote process input. That process input is compared to a process setpoint to maintain the desired process operating point. The process setpoint is adjustable by raise/lower contact inputs, Modbus communications or a configurable remote 4–20 mA setpoint signal.
European Compliance for CE Mark:
- EMC Directive Certified to 89/336/EEC COUNCIL DIRECTIVE of 03 May 1989 on the approximation of the laws of the member states relating to electromagnetic compatibility.
- Low Voltage Directive Certified to the 73/23/EEC COUNCIL DIRECTIVE of 19 February 1973 on the harmonization of the laws of the Member States relating to electrical equipment designed for use within certain voltage limits.
- North American Compliance:
- CSA Certified for Ordinary Locations for use in the United States and Canada.
- CSA Certified for use in Class I, Division 2, Groups A, B, C, D in the United States and Canada.
- NOTE Wiring must be in accordance with applicable electric codes with the authority having jurisdiction.