Woodward 1720-707 |CPU Module, Origin: United States
1.1720-707 Product Overview
The Woodward 1720-707 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. 1720-707 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 1720-707 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.
3. Target signal and feedback signal
To stabilize a physical quantity in the frequency conversion system at the expected target value, the PID function circuit of the
frequency converter continuously compares the feedback signal with the target signal, and adjusts the output frequency and motor
speed in real time based on the comparison results. So, PID control of frequency converters requires at least two control signals:
target signal and feedback signal. The target signal referred to here is the electrical signal corresponding to the expected stable
value of a certain physical quantity, also known as the target value or given value; The actual value of the physical quantity measured
by the sensor is referred to as the feedback signal, also known as the feedback quantity or current value. The functional diagram of PID
control is shown in Figure 2. There is a PID switch in the picture. The PID function can be activated or deactivated by setting the functional
parameters of the frequency converter. When the PID function is effective, the operating frequency is determined by the PID circuit; When the
PID function is invalid, the operating frequency is determined by the frequency setting signal. The working status of PID
switches, action selection switches, and feedback signal switching switches is determined by the setting of functional parameters.
4. Target value given
How to transmit the command information of the target value (target signal) to the frequency converter? Various frequency converters have chosen
different methods, and there are generally two solutions: one is the automatic conversion method, which means that when the preset PID function
of the frequency converter is effective, the frequency setting function during open-loop operation is automatically converted to the target value setting.
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