I. Basic Information

Brand: Woodward (USA)

Model: 9907-163 (505 standard speed controller, AC/DC universal power supply)

Series differentiation:

9907-163: 88~132VAC / 90~150VDC (AC/DC dual-purpose)

9907-164: 18~32VDC low-voltage DC model

Product positioning: Single valve / Dual-executor split-range steam turbine dedicated digital speed control main controller, used for precise closed-loop control of steam turbine speed, load, and inlet valve

Electrical and physical parameters Table

Project Parameters

Power supply AC 88~132V 47~63Hz / DC 90~150V, power consumption 143VA

Speed measurement input MPU magnetic probe: 0.5~25000Hz passive rotational speed signal

Actuator output 2 channels of servo current output, driving turbine oil engine / electro-hydraulic actuator (single valve / split-range double valve)

IO channels 6 channels of programmable 4-20mA analog input, 16 channels of switch quantity DI, 8 channels of relay DO

Human-machine interface 2-line × 24-character LED display + 30-key operation keyboard, panel integrates emergency stop button, overspeed test button

Dimensions 356×280×102mm (14×11×4 inches), net weight ≈ 3.63~4.42kg

Operating temperature range -40℃~+65℃, Class 1 Div 2 explosion-proof certification, explosion-proof hazardous areas can be installed

Communication interface RS232/RS422, standard Modbus RTU, upper computer 505View/OpView software debugging

Protection level NEMA4X/IP56, the circuit board of the entire machine is coated with three protection treatments for anti-corrosion

 Core control functions

Speed PID speed regulation: two control modes of equal speed / deviation, turbine start-stop acceleration, critical speed avoidance, overspeed protection interlock trip;

Split-range double valve control: supports single inlet steam valve / extraction steam type split-range double actuators, simultaneously controlling main steam valve + extraction steam valve opening (505XT is selected for extraction steam type);

Grid-connected load control: after the unit is grid-connected, active load regulation, multi-unit parallel unit load distribution, valve position limit closed-loop;

Safety logic: built-in overspeed shutdown, speed disconnection, actuator fault alarm, relay passive contact output interlock signal;

Parameter storage: fault event recording, running parameter power-off saving, local panel / computer remote modification of setting parameters.

Applicable scenarios

Industrial steam turbine power generation units: self-owned power plants, waste heat power generation, cogeneration steam turbines;

Drum-driven steam turbines: compressors, fans, pump-type industrial drive turbines;

Oil/gas / chemical plant areas: back-pressure / extraction steam turbine speed regulation system of refining and chemical plants.