Woodward Electronic Controls
Electronic Controls for Steam Turbines
505 Steam Turbine Control
Woodward’s 505 electrical control operates industrial steam turbines of all sizes and applications through the steam valve actuation system. The 505 control senses turbine speed via passive or active speed probes, and controls the steam turbine through one or two (split-range) actuators connected to the turbine inlet steam valves.
It includes specifically-designed algorithms and logic to start, stop, control, and protect industrial steam turbines or turbo-expanders, driving generators, compressors, pumps, or industrial fans.
For critical applications requiring increased reliability and redundancy, two 505 controls can be connected in a redundant configuration as an option to increase overall system availability.
Learn more from the 505 Steam Turbine Control product specification
INPUTS
- Power: 18–32 Vdc, 90–150 Vdc, 88–132 Vac (47–63 Hz), 180–264 Vac (47–63 Hz)
- Speed: 2 MPUs (1–30 Vrms) or proximity probes (24 Vdc provided), 0.5 to 15 kHz
- Discrete Inputs: 16 Contact Inputs (4 dedicated, 12 programmable)
- Analog Inputs: 6 Programmable Current Inputs (4–20 mA)
OUTPUTS
- Valve/Actuator Drivers: 2 Actuator Outputs (4–20 mA or 20–160 mA)
- Discrete Outputs: 8 Relay Outputs (2 dedicated, 6 programmable)
- Analog Outputs: 6 Programmable Current Outputs (4–20 mA)
COMMUNICATION
- Serial: 2 Modbus (ASCII or RTU) Comm Ports (RS-232, RS-422, or RS-485 compatible)
Functionality
The 505’s control capabilities are:
- Speed/Frequency Control
- Turbine or Generator Load Control or Limiting
- Turbine Inlet Header Pressure Control or Limiting
- Turbine Exhaust Header Pressure Control or Limiting
- Plant Import/Export Power Control or LimitingIsochronous Load Sharing between units (with DSLC™ control)
- Control of any process directly related to unit load
Features
- Critical Speed Avoidance (3 speed bands)
- Auto Start Sequence (hot & cold starts)
- Valve Limiter(s)
- Security (Program is Password Protected)
- Dual Speed/Load Dynamics
- First-Out Indication (Shutdowns)
- Zero Speed Detection with proximity probe (< 0.5 Hz)
- Peak Speed Indication for overspeed trip
- Two Programmable Functions Keys on the 505’s front panel
- Hand Valve operation (using First Stage Pressure)
- Two independent Modbus comm links
- Remote analog setpoints for Speed/Load, Aux, and Cascade
- Program upload/download capability
- Feed-forward decoupling algorithm for compressors
- –25 to +65 °C ambient air temperature range
- Optional NEMA type 4 (watertight and dust-tight, indoor/outdoor) enclosure for bulkhead mounting with a
- temperature range from –25 to +55 °C
- Approximate dimensions 14L x 11H x 4D inches (356 x 279 x 102 mm)
- Approximate bulkhead enclosure dimensions 20L x 20H x 7.6D inches (508 x 508 x 193 mm)
- Humidity: Lloyd’s ENV2 test #1
- Dry heat: Lloyd’s ENV3
- Salt fog: US MIL-STD-810 method 509.2 procedure 1
- Shock: meets US MIL-STD-810C, method 516.2-1, procedure 1B
- Vibration: Lloyd’s ENV2 test #1
- Certifications: CE (18–32 Vdc version only), UL, & cUL
Pollution Resistance
- Particulate Pollution Resistance: IEC 664-1 Pollution Degree 2 (Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected.)
- Gaseous Pollution Resistance: The polyacrylate conformal coating withstands NO2, CO2, SO2, and H2S gases per IEC 60068-2-60:1995 Part 2.60 Methods 1 and 4 (Flowing Mixed Gas Corrosion Test). It will withstand levels typical of telecommunications and computer installations as defined by Battelle Labs Class III (between IEC 60721-3-3 classification 3C1 and 3C2, light industrial to urban industrial, heavy traffic).