Woodward 5421-123 Servo Position Control Board

Technical Specifications

Model:5421-123

Brand:Woodward

Product type:Servo position control board assembly

Power supply:24 Vdc

Control function:Servo valve drive,valve position closed-loop regulation,4-20mA command signal processing,position feedback acquisition,channel isolation protection

Communication:Internal system bus,4-20mA analog signal

Mounting:Rack mounting

Operating temperature:-40~70℃

Relative humidity:5~95% non-condensing

Weight:1.45kg

Certification:CE,UL

System compatibility

5421-123 belongs to Woodward MicroNet turbine control system family,matched with MicroNet main controllers and hydraulic servo valves.Widely used in gas turbine,steam turbine and generator control cabinets.This is a discontinued legacy servo position control board for power unit maintenance spare replacement.

Function

5421-123 serves as Woodward servo position control board.It receives 4-20mA setpoint command from main controller,collects valve position feedback signal,realizes closed-loop precise position control and drives hydraulic servo valve.It supports redundant position feedback input,adopts proportional integral regulation algorithm to ensure stable valve positioning.It is the core drive component for turbine steam/gas valve control.

Installation

Install 5421-123 in the control cabinet rack.Complete terminal wiring according to wiring drawing.Check power supply polarity,feedback wiring and grounding before power-on.

Interface

‑Internal system bus connector

‑4-20mA command and feedback terminal block

‑Servo valve drive output terminal

‑LED status indicator

Circuit feature

Closed-loop servo control circuit,equipped with ESD and surge suppression design.High precision position adjustment,strong anti-interference performance for power plant cabinet environment.

Feature

5421-123 is obsolete Woodward series spare part.Typical failures include position drift,servo output loss,feedback signal abnormal,communication fault.Check board circuit and terminal pins before replacement.This board must match corresponding Woodward control system,direct substitution without inspection is not recommended.

Diagnostic

When valve out of control,position deviation or signal loss occurs,the module will trigger system fault alarm and report fault code to the main controller.

Built‑in function

Servo valve driving,valve position closed-loop control,4-20mA signal conversion,used as Woodward series servo position control board assembly spare replacement.

Product Brief

5421-123 is Woodward old turbine series servo position control board for gas/steam turbine generator sets and power automation equipment.Confirm controller and servo valve model matching before ordering.ESD protection required during handling and installation.