Woodward SMM40 | Governor | Controller | Potential Converter
1.SMM40 Product Overview
The Woodward SMM40 belongs to the 505/505E series digital turbine controllers. It is a microprocessor-based control module designed for single-valve steam turbines,
including single extraction/admission systems or split-range actuator configurations.
The controller features a front panel Operator Control Panel (OCP) with a two-line, 24-character display and multi-function keypad, allowing easy on-site configuration and monitoring.
2. SMM40 Technical Specifications and Parameters
| Parameter | Details |
|---|---|
| Power Supply | +24 VDC, approx. 1 A |
| I/O Outputs | Discrete Outputs: 8 Analog Outputs: 6 Actuator Outputs: 2 |
| Display / HMI | Two-line, 24-character LCD, with multi-function keypad |
| Dimensions | Approx. 14 × 11 × 4 in (35.6 × 27.9 × 10.2 cm) |
| Weight | Approx. 9.11 lbs (4.13 kg) |
| Operating Temperature | –4 to +140 °F (–20 to +60 °C) |
| Storage Temperature | –40 to +185 °F (–40 to +85 °C) |
| Humidity Standard | 95% RH at 20-55 °C for 48 hours without damage |
| Protection Class | Typically meets industrial dust and water protection standards |
| Communication Protocol | Supports Modbus, RS-232 / RS-422 serial interfaces |
3. Brand History
Woodward, Inc., founded in 1870 and headquartered in Fort Collins, Colorado, USA, is a global leader in energy control systems. The company has a long history of innovation in turbine control, engine management,
and power generation systems.
Woodward products are widely recognized for their reliability and precision in demanding industrial and power generation applications.
4. Applications in Industrial Automation
The SMM40 plays a critical role in industrial automation and power generation environments:
- Steam Turbine Control: Manages startup, speed regulation, and extraction/admission control of steam turbines.
- Power Generation Systems: Used in power plants to regulate turbine-driven generators for stable frequency and load management.
- Compressor and Pump Drive Control: Ensures precise speed control for turbine-driven compressors and pumps.
- Process Industry Applications: Applied in chemical plants, refineries, and other industries requiring precise turbine operation.
- Safety and Protection Functions: Includes overspeed protection, critical speed avoidance, actuator travel limits, and event logging for operational safety.
Standard BASIC language instructions:
for.。 . next: Standard Loop Statement
Gosub: jump to subroutine
Goto: Jump to the program tag (e.g. – “label:”)
if.。 . then: Standard “if/then” judgment
Let: Assignment (optional)
Return: Return from subroutine
End: End the program and enter sleep mode
Instructions related to input/output pins:
Button: Read the key value on the input pin, prevent bounce and automatically repeat
High: Set the input and output pins to a high level
Input: Set the direction of the input/output pins to input
Low: Set one input/output pin to a low level
Output: Set the direction of the input/output pins to output
Pot: Read the potentiometer value on the input and output pins
Pulse: Read the width of the pulse on the input pin
Pulsout: emits pulses of a specified width through an output pin
PWM: Perform pulse width modulation on the output pins
Reverse: Reverse pin input/output direction
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