Woodward 9907-164 505 Digital Governor

Overview

• Microprocessor-based control unit for steam turbines, turbogenerators, and turboexpander modules
• Offers precise speed and load control
• Includes a variety of input and output options

Technical Specifications

Hardware Specifications

Environmental

• Humidity: Lloyd’s Test Specification No. 1, 1996, Humidity Test #1: Two temperature cycles between 20 and 55 °C at 95% relative humidity within 48 hours
• Operating Temperature: Without Enclosure (8923-439) = -25 to +65 °C, With Enclosure (8923-439) = –20 to +60 °C
• Storage Temperature: –40 to +85 °C
• Shock: US MIL-STD-810C, Figure 516.2-1 procedure 1b (30 g 11 ms half-sine pulse)
• Vibration: Lloyd’s Test Specification No. 1, 1996, Vibration Test #1: 5-13.2 Hz, 1.0 mm; 13.2–100 Hz, 0.7 g
• Pollution Resistance: IEC 664-1 Pollution Degree 2; Polyacrylate coating withstands NO2, CO2, SO2, and H2S gases

Power Supply

• Insulation Resistance/HiPot: 24 Vdc power supply: 707 Vdc from power input to chassis; 120 Vac/dc and 220 Vac version: 2200 Vdc from power input to chassis
• Power Inputs: Low Voltage dc (18–32 Vdc), ac/dc (90–150 Vdc or 88–132 Vac), High Voltage ac (180–264 Vac)
• Power Outputs: Three 5 Vdc communications port isolated power supplies, 5 Vdc digital power (2.5 A max.), 24 Vdc analog power (1.275 A max.), 15 Vdc analog power (150 mA max.), –15 Vdc analog power (150 mA max.), 24 Vdc isolated contact input power (100 mA max.)

Microprocessor

• Motorola 68332 Microcontroller/20 MHz

General I/O Specifications

Analog Inputs

• Inputs: Six 4–20 mA (one isolated, five non-isolated)
• Resolution: 16 Bit over 0-25 mA full-scale range
• Accuracy: Non-isolated input: 0.145%, Isolated input: 0.186%
• Temperature Drift: Non-isolated: 130ppm/°C, Isolated: 245ppm/°C
• Isolation: Non-isolated: 2 MΩ to chassis; Isolated: infinite ohms to chassis

Speed Sensor Inputs

• Channels: Two, jumper selectable between MPU and Proximity input
• MPU Input: 1–25 VRMS voltage range, 100–15000 Hz
• Proximity Input: 16–28 Vdc voltage range, 0.5–15000 Hz
• Resolution: Minimum of 12 bits, 16 bits at 100 Hz
• Accuracy: 0.027% worst case over temperature and time

Actuator Drivers

• Channels: Two, software selectable for 4–20 mA or 20–160 mA range
• Current Readback: To detect over/under current
• Dither: Software selectable (0–10 mA)
• Resolution: 10 bits over full scale range
• Accuracy: 0.25% of full scale output worst case @ 25 °C

Analog Outputs

• Outputs: Six software configurable 4–20 mA
• Load: 600 Ω maximum
• Resolution: 10 bits over 25 mA full scale range
• Accuracy: 0.4% of 25 mA full scale output worst case @ 25 °C

Relay Outputs

• Outputs: Eight software configurable relays
• Contacts: One set of form C contacts per relay output
• Ratings: European and UL Recognized Ratings

Discrete Inputs

• Inputs: 16 isolated discrete inputs
• Power: Isolated +24 V power provided
• Draw: 2.5 mA per input when contact is closed

Modbus Communications Ports

• Ports: Two isolated
• Protocols: RTU and ASCII
• Baud Rates: Up to 57600
• Hardware: Supports RS-232, RS-422, RS-485
• Cable Length: Maximum network cable length is 1220 m/4000 ft

Personal Computer Communications Port

• Port: One isolated
• Protocol: RS-232 only
• Baud Rates: Up to 57600
• Cable Length: Maximum length is 15 m (50 ft)

Built-In Operator Interface

• Display: Two line x 24 character LED display
• Keypad: 30 key multi-function
• Buttons: Emergency stop and overspeed test
• Indicators: Alarm and overspeed test LED

Software Specifications

• Speed/Load Control: NEMA D or better
• Execution Rate: Speed/Load Control: 10 ms, Auxiliary Control: 20 ms, others as specified