WOODWARD 9907‑147‑203 ProTech 203 Overspeed Protection Module
Woodward 9907‑147‑203 also known as ProTech 203 is a triple modular redundant digital overspeed protection system designed for turbines and various prime movers. The Woodward 9907‑147‑203 overspeed protection module adopts 2 out of 3 voting logic to provide high safety level protection for critical rotating machinery in industrial scenarios.
Product Overview
Woodward 9907‑147‑203 ProTech 203 is a de energize to trip digital overspeed protection unit belonging to the Woodward ProTech safety protection product series. This overspeed protection module is widely used to replace traditional mechanical overspeed bolt protection devices for gas turbines steam turbines hydro turbines and large industrial compressors.
The Woodward 9907‑147‑203 is equipped with three independent speed measurement channels which receive speed signals from magnetic pickup sensors. Each channel completes speed calculation and threshold judgment independently. The system adopts hardware 2oo3 voting mechanism to output trip signals. It completely avoids single point failure risks. A single channel fault will not cause the failure of the whole overspeed protection system. The device is suitable for new project installation and old turbine control system renovation and upgrading.
Core product information part number 9907‑147‑203 product series ProTech 203 mainstream trip mode de energize to trip fail safe design.
Working Principle
The Woodward ProTech 203 system relies on three fully independent signal acquisition and processing channels to realize stable and reliable overspeed protection functions.
First three independent channels named A B and C are connected to three sets of magnetic pickup sensors to collect real time shaft rotation frequency signals respectively. Each channel is equipped with independent CPU power supply and signal processing unit to complete speed data acquisition calculation and overspeed threshold comparison separately without mutual interference.
The core control logic is hardware 2 out of 3 voting. The system will only trigger the turbine trip shutdown action when two or three channels simultaneously detect the overspeed state. If only a single channel has abnormal signals or faults the system will not output trip commands to ensure the stable operation of equipment.
The whole machine adopts classic fail safe de energize to trip design. The trip relay keeps energized during normal equipment operation. When overspeed sensor signal loss power failure or internal hardware fault occurs the relay will automatically de energize to trigger equipment shutdown and prevent major safety accidents of rotating machinery.
The built in frequency test source supports online self inspection of each channel. Users can complete channel function test without stopping the prime mover which improves the convenience of daily maintenance for the Woodward 9907‑147‑203 overspeed protection module.
Key Technical Specifications
| Manufacturer | Woodward |
| Part Number | 9907‑147‑203 ProTech 203 |
| Trip Mode | De Energize To Trip Fail Safe |
| Speed Input Type | Three Channel Magnetic Pickup |
| Frequency Input Range | 100 Hz to 32 kHz |
| Measurable Speed Range | 100 RPM to 20000 RPM |
| Overspeed Trip Setting Range | 250 Hz to 25 kHz |
| Speed Measurement Accuracy | 0.05 percent trip frequency plus 2 Hz |
| System Response Time | Less than 20 ms |
| Power Supply | 18 VDC to 32 VDC standard 24 VDC |
| Relay Contact Rating | 2 A at 28 VDC resistive 0.3 A at 115 VAC resistive |
| Operating Temperature Range | minus 25 degrees Celsius to 60 degrees Celsius display minus 15 degrees Celsius to 60 degrees Celsius |
| Protection Grade | NEMA 4 panel mounting chassis |
| Equipment Dimension | 482.6 mm width 310.4 mm height 142.7 mm depth |
| Communication Interface | RS485 Modbus RTU |
| Display Configuration | Three sets of independent two line sixteen character LCD screens |
| Industry Certification | UL industrial safety standard certification |
Core Features and Product Advantages
Triple Modular Redundancy 2oo3 Hardware Voting
The three channels of the Woodward 9907‑147‑203 overspeed protection module are completely independent including sensor input CPU operation power supply drive and relay output. There is no shared hardware module. Single channel failure wiring fault or signal abnormality will not affect the normal operation of the other two channels and will not cause system protection failure. It effectively eliminates single point failure risks and meets high standard industrial safety requirements.
Support Online Hot Replacement Maintenance
The ProTech 203 module supports hot swap function. When a single channel fails maintenance personnel can replace the faulty module online without stopping the operation of the main equipment. It greatly reduces equipment shutdown time improves industrial operation efficiency and reduces maintenance cost for power plants and petrochemical enterprises.
Built in Online Self Test and Remote Test Function
The internal integrated frequency signal generator can simulate overspeed signals to test the accuracy and sensitivity of each channel. All channel tests can be completed online without shutting down the turbine. At the same time it is equipped with remote test contacts which support remote trigger test and facilitate centralized equipment management.
Physical Key Lock Permission Management
The equipment is equipped with an independent physical key switch which can lock parameter modification and test operation permissions. It effectively prevents unauthorized personnel from mistakenly modifying overspeed trip parameters on site and avoids equipment safety risks caused by human misoperation.
Complete Fault Diagnosis and Event Recording Function
Each channel is equipped with independent LED indicator lights which can clearly display sensor faults circuit faults and channel trip status in real time. The system can automatically record the peak speed data of trip events which is convenient for engineers to analyze fault causes after accidents. It is also equipped with alarm relay output which can upload fault information to the plant DCS system in real time.
High Safety Fail Safe Trip Logic
In case of unexpected power failure internal hardware damage or complete loss of sensor signals the system will automatically trigger the trip shutdown action. This fail safe design ensures that the equipment can be effectively protected in any extreme fault state and avoids runaway damage of high speed rotating machinery.
Independent Local Human Machine Operation Interface
Each channel of ProTech 203 is equipped with a separate LCD display and operation keypad. On site engineers can locally view real time operating speed parameters set overspeed trip thresholds and modify sensor fault delay parameters without relying on upper computer software.
Application Fields
- Power Generation Industry: It is used for overspeed safety protection of gas turbines steam turbines and hydro turbine generator sets. It is widely applicable to thermal power plants combined cycle power plants and distributed energy stations. It is an ideal replacement for traditional mechanical overspeed trip devices.
- Oil Gas and Petrochemical Industry: Suitable for safety protection of centrifugal compressors and turbo expanders in natural gas compression stations refineries and chemical production devices. It can effectively prevent equipment burst and shaft damage accidents caused by overspeed of high speed rotating equipment.
- Heavy Industrial Equipment Field: It can provide overspeed protection for large industrial blowers high speed centrifugal units and various industrial prime movers. It supports both new project matching installation and old control system renovation and upgrading.
- Marine and Offshore Engineering: The equipment has strong vibration resistance and electromagnetic interference resistance. It is suitable for turbine and compressor safety protection of offshore oil and gas platforms and marine power equipment adapting to harsh offshore working environments.
Hardware Installation and Wiring Notes
- Three groups of magnetic pickup signal inputs need to use shielded twisted pair cables. The shielding layer adopts single ended grounding mode to reduce on site electromagnetic interference and ensure stable signal transmission.
- The A B C three channels must adopt independent power supply input respectively. It is forbidden to use a single power supply to supply power for three channels at the same time to avoid simultaneous failure of multiple channels caused by power supply faults.
- The equipment adopts NEMA 4 standard panel mounting structure. During installation it is necessary to avoid high voltage equipment and heat sources reserve enough ventilation and heat dissipation space to ensure stable long term operation of the module.
- The trip relay circuit strictly follows the Woodward official manual wiring standard. The 2oo3 voting loop must be correctly configured to ensure the effective execution of protection logic.
- The overspeed trip threshold parameters of the three channels must be set consistently to avoid logic judgment errors caused by parameter differences.
Compatible Products and Related Series
- Matching Accessories Woodward magnetic pickup speed sensor
- Related Product Series Woodward ProTech 103 ProTech 310 overspeed protection modules
- Matching Control Equipment Woodward 2301A 2301E turbine governors
Frequently Asked Questions
Q1 What is the difference between DET and ETT versions of 9907‑147‑203
A1 The 9907‑147‑203 mainstream version adopts DET de energize to trip mode. This version will automatically trip when power is lost which is the safest design for rotating machinery protection. ETT energize to trip equipment only trips when the relay is powered on. It will lose protection function in case of power failure so it is rarely used in key turbine protection scenarios.
Q2 Is it possible to replace a single channel module without stopping the turbine
A2 Yes the ProTech 203 module supports online hot replacement. Operators can replace the faulty single channel according to the official operation procedures while ensuring the normal operation of the other two channels without shutting down the main equipment.
Q3 What are the main causes of MPU sensor fault alarm
A3 The main reasons include damaged MPU sensor open circuit or short circuit of signal cable unreasonable gap between sensor and gear and incorrect configuration of MPU fault delay parameters.
Q4 Can Woodward 9907‑147‑203 be connected with DCS system
A4 Yes. The equipment uploads real time speed data alarm status and trip records to DCS system through RS485 Modbus RTU communication. At the same time the alarm dry contact can be hard wired to DCS digital input channel to realize redundant fault alarm.
Q5 Which official document is used for equipment commissioning reference
A5 All commissioning and maintenance operations refer to Woodward official manual 85201 ProTech 203 Installation and Operation Manual
Q6 What is the maximum measurable speed of the module
A6 The maximum measurable speed of the equipment is 20000 RPM which is suitable for various high speed turbine equipment that cannot be accurately protected by traditional mechanical overspeed devices.
Q7 Can the overspeed trip threshold be modified on site at will
A7 No. The equipment is protected by physical key lock. The modification of key parameters such as overspeed trip threshold needs to comply with enterprise safety approval procedures and the parameters of three channels must be kept consistent after modification.
Q8 Operation steps after equipment overspeed trip
A8 First check the peak speed data and channel trip status recorded by the equipment then inspect MPU sensor and circuit wiring troubleshoot hardware faults and reset the equipment to restart operation after confirming no hidden dangers.
Technical Description and Statement
The 9907‑147‑203 ProTech 203 is a safety grade protection device. All commissioning parameter modification maintenance and repair operations must be completed by professionally trained technical personnel.
Online hot replacement wiring configuration and protection loop setting must be implemented in strict accordance with Woodward official technical specifications to avoid equipment failure and safety accidents caused by non standard operation.
3005319639