The Woodward Peak 150 is a digital control system designed specifically for steam turbine speed and control applications. It combines a digital controller, turbine control logic, input/output circuitry, relay interfaces, actuator control, display, and programming functions in one industrial control platform. Woodward documentation identifies the Peak 150 as a digital control for steam turbines and provides installation, programming, operating, communication, and troubleshooting procedures.
The referenced unit is marked 9905-852 Rev N #2 and is listed as a used โRunner Takeout.โ The exact 9905-852 configuration should be verified against the equipment nameplate and wiring documentation before replacement because Peak 150 versions use different power-supply and option configurations.
๐ Product Datasheet
| Parameter | Value |
|---|---|
| Brand | WOODWARD |
| Model | PEAK 150 |
| Series | Peak 150 Digital Control Series |
| Product Name | Digital Steam Turbine Controller |
| Part Number | 9905-852 |
| Revision | Rev N |
| Controller Type | Digital Steam Turbine Control |
| Application | Steam Turbine Speed / Valve Control |
| Power Supply | Configuration dependent; Peak 150 versions include AC/DC and 24 VDC variants |
| Maximum Power Consumption | 38 W |
| Enclosure | NEMA 4 / NEMA 4X depending on configuration |
| Dimensions | Approx. 19 ร 12 ร 4 in (483 ร 305 ร 102 mm) |
| Magnetic Pickup Inputs | 2 |
| Analog Input | 1, 4โ20 mA or 1โ5 VDC |
| Discrete Inputs | 8 |
| Analog Outputs | 2 |
| Actuator Output | 1, 4โ20 mA or 0โ200 mA |
| Relay Outputs | 4 |
| Communication | Optional Modbus / service programmer interface |
| Country of Origin | United States according to the referenced listing |
| Condition | Used / Runner Takeout according to listing |
Woodward documentation specifies two magnetic-pickup inputs, one remote speed-setting analog input, eight discrete inputs, two analog outputs, one actuator output, and four relay outputs. The documented maximum power consumption is 38 W.
โ๏ธ Main Features
- โ๏ธ Digital steam turbine governor/control
- ๐ Dual magnetic pickup speed inputs
- ๐๏ธ Remote speed-setting input
- ๐ Actual-speed and configurable analog outputs
- ๐ง Dedicated actuator output
- ๐จ Emergency-stop and alarm-reset input capability
- โถ๏ธ Turbine start and idle/minimum-governor functions
- ๐ Raise/lower speed control
- ๐ก Optional Modbus communication
- ๐ฅ๏ธ Front display and keypad
- ๐ก๏ธ NEMA 4/NEMA 4X enclosure options
- ๐พ Programmable configuration and service menus
- ๐งช Built-in diagnostic and troubleshooting functions
The Peak 150 provides multiple operating modes, including automatic start, manual control, remote control, and combination control modes.
๐ ๏ธ Operating Procedure and Usage
The Peak 150 is not a general-purpose PLC. It is a dedicated turbine control system and must be configured for the specific steam turbine before operation. Woodward explicitly warns that the turbine should not be operated until the Peak 150 has been programmed, as incorrect configuration can cause equipment damage.
Basic Operating Procedure
- ๐ Inspect the controller, terminals, enclosure, and wiring.
- ๐ท๏ธ Verify 9905-852 Rev N against the original controller.
- โก Confirm the correct power-supply version.
- ๐ Verify both magnetic pickup speed signals.
- ๐ง Confirm actuator wiring and actuator type.
- ๐๏ธ Check remote speed-setting input if used.
- ๐จ Verify emergency-stop and shutdown circuits.
- ๐ Load or verify the correct Peak 150 configuration.
- ๐ฅ๏ธ Check displayed speed and control status.
- ๐งช Perform commissioning tests before admitting steam.
- โถ๏ธ Start the turbine using the approved plant sequence.
- ๐ Monitor actual speed, setpoint, actuator output, and alarms during operation.
The Peak 150 can be programmed using Woodward’s hand-held programmer, model 9905-292, according to the manufacturer’s manual.
๐ Power-On / Power-Off Sequence
Power-On
โ ๏ธ 1. Confirm the turbine is in a safe starting condition.
๐ 2. Verify all wiring and protection circuits.
โก 3. Apply the correct Peak 150 control power.
๐ฅ๏ธ 4. Allow the controller to initialize.
๐ 5. Check display, LEDs, and diagnostic indications.
๐ 6. Confirm valid magnetic-pickup speed signals.
๐ง 7. Verify actuator output and valve-control status.
๐จ 8. Confirm emergency-stop and trip circuits are healthy.
๐ 9. Verify the correct turbine configuration and operating mode.
โถ๏ธ 10. Start the turbine only after all permissives are satisfied.
Power-Off
๐ 1. Reduce turbine load according to the plant operating procedure.
โฌ๏ธ 2. Bring the turbine to the approved shutdown condition.
๐ซ 3. Close or control the steam admission system through the normal turbine shutdown sequence.
๐ 4. Confirm turbine speed is falling normally.
โก 5. Remove controller power only when the turbine is safely stopped and maintenance requires isolation.
๐ 6. Apply lockout/tagout before disconnecting wiring or removing the controller.
๐ Product Usage Instructions
The Peak 150 controls turbine speed through its actuator output. The controller receives turbine-speed information primarily through magnetic pickup inputs and uses configured control logic to determine the required actuator command.
The documented magnetic pickup inputs accept a minimum input of approximately 1 Vrms, with a frequency range of approximately 200 Hz to 15 kHz. The remote speed-setting input can be configured for 4โ20 mA or 1โ5 VDC.
The actuator output can be configured for 4โ20 mA or 0โ200 mA, depending on the particular hardware/configuration.
For replacement work, record the original controller’s configuration before removing it. Important settings include:
- Turbine rated speed
- Minimum/maximum speed
- Speed setpoint
- Acceleration/ramp parameters
- Actuator characteristics
- Magnetic pickup configuration
- Remote speed-setting range
- Start mode
- Idle/minimum governor settings
- Overspeed-test settings
- Emergency shutdown logic
- Relay assignments
- Modbus settings, if installed
The Peak 150 enclosure is designed for vertical wall or 19-inch rack mounting, and Woodward specifies separate shielding practices for magnetic-pickup and actuator wiring.
๐ง Maintenance Recommendations
๐ Inspect terminal connections and wiring periodically.
๐ Check magnetic pickup signals if unstable speed readings occur.
๐ง Inspect actuator wiring and mechanical linkage.
๐ Compare displayed speed against an independent calibrated measurement.
๐ Review alarms and trip history after abnormal shutdowns.
๐พ Keep a backup of the controller configuration.
๐ก๏ธ Follow ESD precautions when servicing internal electronics.
โก Verify power-supply voltage before replacing or modifying the controller.
Woodward’s manual specifically includes troubleshooting, service procedures, programming worksheets, and Modbus communication information.
โ Common Questions & Answers
Q: What is the Woodward Peak 150 used for?
A: It is a dedicated digital control system for steam turbines, primarily used for turbine speed and actuator control.
Q: What is the part number of this unit?
A: The referenced unit is 9905-852, marked Rev N #2.
Q: Is the Peak 150 a PLC?
A: No. It is a dedicated turbine control/governor system with specialized turbine control functions.
Q: Does it control turbine speed?
A: Yes. Speed feedback from magnetic pickups is used by the control system to regulate turbine operation and actuator output.
Q: How many magnetic pickup inputs are available?
A: The documented Peak 150 has two magnetic pickup inputs, with the high signal selected between the two identical inputs.
Q: What is the maximum power consumption?
A: The Peak 150 documentation specifies a maximum power consumption of 38 W.
Q: What is the enclosure size?
A: The documented enclosure is approximately 19 ร 12 ร 4 inches, or approximately 483 ร 305 ร 102 mm.
Q: Can the controller be powered on and immediately used to run a turbine?
A: No. The controller must first be correctly programmed and commissioned for the specific turbine. Woodward explicitly warns against operating the turbine before programming.
Q: Does it support Modbus?
A: Optional Modbus communication is available on applicable Peak 150 configurations.
Q: What programmer is used with the Peak 150?
A: Woodward documents the 9905-292 hand-held programmer for Peak 150 programming.
Q: Is 9905-852 compatible with every Peak 150 system?
A: Not necessarily. Peak 150 units have different power-supply and option configurations. Always match the complete part number, revision, wiring, and turbine configuration before replacement.
๐ Recommended WOODWARD Models / Series
- WOODWARD Peak 150 Digital Turbine Control
- WOODWARD 9905-857 Peak 150
- WOODWARD 9905-858 Peak 150
- WOODWARD 9905-860 Peak 150
- WOODWARD 9905-861 Peak 150
- WOODWARD 9905-863 Peak 150
- WOODWARD 9905-864 Peak 150
- WOODWARD 9905-866 Peak 150
- WOODWARD 9905-867 Peak 150
- WOODWARD 9905-292 Peak 150 Hand-Held Programmer
The Woodward documentation lists these Peak 150 part-number variants as different control configurations, so the exact suffix should be matched when sourcing a replacement.
