Woodward 9907-163 505 AC/DC Steam Turbine Digital Control

9907-163 Woodward 505 digital governor for steam turbines

The Woodward 505 9907-163 is the AC/DC powered version of the 505 digital governor for steam turbines. The 505 is a field-configurable, microprocessor-based control that starts, controls and protects a steam turbine with a single or split-range actuator arrangement. Woodward lists three English-language versions that differ only in supply voltage, and 9907-163 is the one that runs from 88 to 132 V AC or from 90 to 150 V DC. Seven Star LLC supplies 9907-163 and related Woodward 505 hardware in Oman and the GCC as an independent supplier in Muscat.

The 505 part number family: where 9907-163 sits

The manual also states an optional NEMA 4X bulkhead mounting box (8923-439) and shows each part number with a revision letter, for instance 9907-163U. Controllers shipped with later revision letters carry a polyacrylate conformal coating on the circuit boards that resists sulfur-bearing gases, and these units have a label on the side stating sulfur-resistant conformal coated. In sulfur-rich atmospheres, such as sour gas plants, that coating is relevant when you compare units.

9907-163 technical specifications

These figures come from the Woodward 505 and 505E product specification and the 505 manual. Confirm any approval for the exact unit and region on the nameplate.

How the 505 controls a turbine: what 9907-163 runs

The controller carries the speed and load PID with dual dynamics, a cascade PID, and an auxiliary PID that can act as a controller or as a limiter. Together these cover speed or frequency control, generator load, inlet and exhaust header pressure, import and export power, and process variables tied to turbine output. Overspeed protection logic and first-trip indication of shutdown causes are built in, and the controller moves between control modes without a bump if a transducer fails. Functions such as critical speed avoidance bands, automatic hot and cold start sequences, valve limiters and local or remote priority selection are part of the standard program.

Programming is done through the front panel menus, with configuration saved in the unit. This lets a plant engineer match the 505 to the specific turbine, and also means that a replacement 9907-163 must be loaded with the correct configuration file before the turbine is run.

Selecting and ordering 9907-163: checklist

• Read the supply voltage on the existing controller: 9907-163 is for 88 to 132 V AC or 90 to 150 V DC only.
• Compare the revision letter and the conformal coating label.
• Confirm that the unit is a 505 and not a 505E (extraction or admission) or a Peak150.
• Obtain the configuration file or the printed settings of the installed controller.
• Check the mounting: panel or the optional bulkhead box 8923-439.
• Verify the spare connector blocks and wiring on the existing control panel.

Installation, commissioning and maintenance of 9907-163

Mount the unit in a cabinet or control panel at a position where the front panel can be read and operated, keep the signal wiring of the speed probes apart from power cables, and use shielded cable for speed and 4 to 20 mA signals. During commissioning check the speed signals first, then actuator polarity and range, then the trip inputs, and last the control loops. Document every setting changed, since the firmware stores them in the unit.

For maintenance, back up the configuration with the Woodward service tool, check the electrolytic components in old power sections, and check connector blocks for heat marks. A tested spare 9907-163 with the right configuration on the shelf allows a turbine to be restored quickly after a control failure.

Typical applications of 9907-163 in Oman and the GCC

The 505 is applied to steam turbines driving generators, compressors, pumps and fans in refineries, gas plants, petrochemical units, fertiliser plants and power and desalination stations. In the Gulf region the combination of high ambient temperature, humid coastal air and dust makes control room and panel condition important, and the sulfur-resistant coating option helps in plants where hydrogen sulfide is present. AC/DC supplied units such as 9907-163 are common where the plant has a 110 V DC battery system or a 120 V AC instrument supply for turbine controls.

Information to send with a 9907-163 RFQ

• Part number with revision letter (for example 9907-163U)
• Quantity and whether tested or surplus is acceptable
• Turbine type, actuator type and supply voltage
• Configuration file or printed settings if available
• Delivery location in Oman or the GCC

Related Woodward products: Woodward 505XT Digital Governor Steam Turbine Control System, Woodward 505 Digital Control for Steam Turbines, Woodward easYgen-3500XT Genset and Breaker Controller, Woodward Flex500 Digital Control for Turbines, Engines and Compressors, Woodward MicroNet Plus Control System, Redundant or Simplex and Woodward SPM-D10 Synchronizing Unit.

Documents and quotation

The Woodward 505 manual (85017) is attached on this page and contains the part number options, installation guidance and the configuration procedure.

Send the part number and the unit details and we will confirm availability and lead time.