Woodward 9905-857 Peak 150 Digital Steam Turbine Control

Description

The Woodward 9905-857 is a digital control module from the Peak 150 series, designed for precise speed and load regulation of single-valve steam turbines. Operating on 24V DC, it features a rugged NEMA 4 enclosure and advanced control capabilities for demanding industrial environments.

Specifications

• Model: 9905-857
• Series: Peak 150
• Power Supply: 24 V DC
• Max Power Consumption: 38 W
• Display: 5-digit LED speed readout
• Control Type: Digital PID controller
• Input Signals: Magnetic pickup, 4–20 mA remote speed control
• Output Signals: 4–20 mA actuator drive, PWM, relay outputs
• Front Panel Interface:
  • 6 LED indicators (CPU, MPUs, remote signal, shutdown, overspeed test)
  • 6 keypad switches (raise/lower speed, start, overspeed test, reset, manual trip)
• Failsafe Functions: Magnetic pickup loss detection, slow roll-down override
• Environmental Standards:
  • Humidity: MIL-STD-810D Method 507.2
  • Vibration: MIL-STD-167 Type 1
  • Shock: MIL-STD-810C Method 516.2
• Operating Temperature: –25°C to +60°C
• Storage Temperature: –40°C to +85°C
• Dimensions: 483 mm × 310 mm × 105 mm
• Weight: Approx. 1.2 kg
• Enclosure Rating: NEMA 4 (dust and water-tight)
• Compliance: CSA Listed (Class I, Div 2, Groups A–D)

Features

• Precise Speed Control: Digital PID algorithm ensures stable turbine operation
• Remote Speed Adjustment: Accepts 4–20 mA process signals for dynamic control
• Critical Speed Avoidance: Protects turbine from excessive vibration zones
• Emergency Shutdown Capability: Manual trip and overspeed test functions
• User-Friendly Interface: LED indicators and keypad switches for local control
• Environmental Resilience: Built to withstand industrial shock, vibration, and humidity
• Handheld Programmer Support: Compatible with Woodward configuration tools
• Application Versatility: Ideal for steam turbines in power generation, oil & gas, and industrial machinery