Woodward 9905-860 Peak 150 Steam Turbine Control – 24 VDC Modbus

Description

Product Description

The Woodward 9905-860 belongs to the Peak 150 series. It is a digital steam turbine control. This compact unit saves budget and space. It includes Modbus communication for easy PLC integration. The NEMA 4 enclosure protects against water and dust. Use it for single-valve rack or single-valve steam turbines. This is the 24 VDC version. A handheld programmer prevents unwanted changes during setup.

Key Technical Specifications

• Brand: Woodward
• Model: 9905-860
• Series: Peak 150
• Input Voltage: 24 VDC
• Power Draw: 38 W maximum
• Display: 5-digit LED speed display
• Status Indicators: 6 LED indicators for remote speed signal, shutdown, MPU 1/2, CPU, overspeed test
• Keypad: 6 buttons for raise/lower speed, start, emergency trip, alarm reset, overspeed test
• Magnetic Pickup Inputs: 2 identical, high-signal-selected inputs
• Measurement range: 0 to 99,999 RPM (typical)
• Frequency response: 10 Hz to 15 kHz
• Sensitivity: 150 mV RMS minimum for magnetic pickups
• Linearity: ±0.25% of full scale
• Resolution: 1 RPM on display
• Operating temperature: -25°C to +60°C
• Storage temperature: -40°C to +85°C
• Environmental protection: NEMA 4 rated for dust and water ingress
• Immunity: Meets industrial EMC standards for noise and surge

Dimensions & Mounting

• Width: 483 mm
• Height: 310 mm
• Depth: 105 mm
• Panel cutout required: standard 19-inch rack mount
• Mounting type: front panel or enclosure door

Installation Guide

• Mount unit in a NEMA 4 rated cabinet for full protection.
• Connect 24 VDC power with proper grounding.
• Wire magnetic pickups to MPU1 and MPU2 terminals.
• Use shielded cables for speed signals to reduce noise.
• Set up parameters using the handheld programmer only.
• Verify Modbus wiring before powering on.

Debugging & Maintenance Convenience

• Handheld programmer avoids accidental setting changes.
• LED status indicators show real-time system health.
• Front keypad allows quick emergency trip and reset.
• No special tools needed for panel removal.
• Diagnostic logs accessible via Modbus.

Compatibility

• Works with single-valve rack steam turbines.
• Modbus RTU communication supports most PLCs like Modicon Quantum.
• Accepts signals from two passive magnetic pickups.
• Compatible with Woodward handheld programmer model 9905-XXX series.

Certifications

• CE marked for European safety standards
• NEMA 4 – indoor use only
• RoHS compliant
• UL recognized component

What’s in the Box

• Woodward 9905-860 controller unit – 1 piece
• Terminal block connectors – 1 set
• Quick start guide – 1 copy
• Handheld programmer (sold separately)

Warranty & Shipping

• 12-month warranty from date of shipment.
• Warranty covers manufacturing defects only.
• Shipping carriers: FedEx, UPS, DHL.
• Express delivery available worldwide.
• Tracking number provided within 24 hours.

Typical Applications

• Single-valve steam turbine control
• Small to medium power generation units
• Industrial boiler-turbine systems
• Remote off-grid turbine sites
• Retrofit projects replacing older analog controls

Diagnostic Capabilities

• Real-time RPM display with 1 RPM resolution
• LED alarms for MPU failure or signal loss
• Overspeed test function with automatic shutdown
• Remote speed setting signal monitoring
• CPU health indicator warns of internal errors

Frequently Asked Questions (FAQ)

• • Q: Can this unit replace an older Woodward 505?
  • A: Yes, for single-valve turbines. For complex multi-valve units, choose a higher model.

• • Q: Do I need a separate display?
  • A: No. The built-in 5-digit LED shows speed directly.

• • Q: What happens if one magnetic pickup fails?
  • A: The unit automatically switches to the second pickup with no interruption.

• • Q: Is the handheld programmer mandatory?
  • A: Yes. It prevents accidental changes from the front keypad.

• • Q: Can I use this outdoors?
  • A: Only if placed inside a NEMA 4 enclosure.

• • Q: What is the typical lifespan?
  • A: Over 10 years in clean industrial environments with proper power.

• • Q: Which Modbus code does it support?
  • A: Modbus RTU, function codes 03 and 06.

• • Q: How do I select the right model?
  • A: Choose 24 VDC (9905-860) or 120 VAC version. Confirm turbine valve type before ordering.

• • Q: Can I test overspeed without running the turbine?
  • A: Yes. Use the overspeed test button in simulation mode via the programmer.

• Q: What should I check if speed reading is unstable?
• A: Verify pickup gap (0.5 mm typical) and cable shielding.

Buyer’s Guide – Selecting the Right Unit

• Verify turbine type: this model fits single-valve rack only.
• Confirm supply voltage: choose 9905-860 for 24 VDC systems.
• Check if Modbus is required for your PLC integration.
• For harsh washdown areas, NEMA 4 is sufficient but not submersible.
• Order the handheld programmer separately if not owned.
• Need dual pickups? This unit includes two with auto-selection.
• For larger turbines with multiple valves, ask about Woodward 505 series.

For inquiries or custom quotes, please contact us:
+86 158 8020 0923 (WhatsApp)

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