Woodward 990-05-50-02-00 | Governor | Controller | Potential Converter
1.990-05-50-02-00 Product Overview
The Woodward 990-05-50-02-00 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. 990-05-50-02-00 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 990-05-50-02-00 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.
d、 Holding torque:
It refers to the torque at which the stator locks the rotor when the stepper motor is powered on but not rotating. It is one
of the most important parameters of stepper motors, and the torque of stepper motors is usually close to the holding
torque at low speeds. Due to the continuous attenuation of the output torque of a stepper motor with increasing speed,
and the variation of output power with increasing speed, maintaining torque has become one of the most important parameters
for measuring a stepper motor. For example, when people refer to a 2N. m stepper motor, unless otherwise specified, it means a
stepper motor that maintains a torque of 2N. m.
Common faults and maintenance of stepper motor drivers
Given that many friends are not familiar with how to handle faults in stepper motor drivers, today the editor has listed some common
causes and solutions for stepper motor driver failures.
1. Stepper driver malfunction
Reason for malfunction: Electrostatic discharge (poor working environment).
Troubleshooting method: First, connect the PE in the electrical cabinet to the ground. If there is still a fault, the driver module is damaged and needs to be replaced.
2. Motor stalling at high speed
Reason for malfunction: Design issues with the transmission system.
Exclusion method: If the high-speed jog does not cause blockage when the feed rate is 85%, use the line acceleration feature;
Reduce the maximum feed rate; Replace the fire torque stepper motor.
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