Model Interpretation

9907: General series code of 505E digital governor;

167: DC24V (18–32VDC) power supply specification, triple closed-loop control for dual extraction + admission, full standard factory IO configuration, supports program upload/download via communication port.

Technical Specifications

Electrical Parameter

Power Supply: DC18–32V (rated 24VDC, rated input current ≤1.2A)

Operating Temperature: -20℃ ~ +70℃; Storage Temp: -40℃ ~ +85℃, Relative Humidity 5%~95%RH non-condensing

Overall Dimension:356×279×102mm, Net Weight≈2.72kg, panel embedded installation structure, front panel NEMA4/IP54 protection grade, rear wiring terminal IP30

Certification: CE, UL & cUL industrial safety certification, PCB conformal coating against damp and oil mist corrosion

IO Configuration

Analog Input: Magnetic pickup speed signal input, multi-channel valve position feedback, 4–20mA process parameter acquisition;

Analog Output:6 channels programmable 4–20mA analog output for field instrument transmission;

Actuator Drive:2 independent servo drive outputs to drive double split-range hydraulic actuators;

Discrete I/O:8-channel SPDT relay dry contact output, multi-point digital DI interlock signal input.

Interface and Communication Configuration

Front Panel: 2-line×24-character LCD display + membrane operation keypad + red emergency stop pushbutton, for local parameter setting, real-time data checking and fault code inquiry;

Rear Terminal Block: Screw fixed terminal row for hard wiring of speed probe, actuator, AI/AO and discrete switching signals;

Communication: Standard Modbus RTU RS485 serial port, supports remote parameter upload/download and fault alarm transmission to upper DCS/SCADA system.

Core Function

Full automatic sequential control of turbine startup, speed-up, grid synchronization, on-load adjustment and shutdown; realizes three independent closed-loop control: rotating speed, dual extraction pressure and admission steam pressure with interlocking valve linkage algorithm.

Built-in overspeed protection, valve stroke upper/lower limit interlock and emergency trip logic, effectively avoiding over-speed runaway and abnormal steam pressure fluctuation.

Complete real-time self-diagnosis function, automatic fault alarm for pickup open-circuit, actuator circuit short/open and abnormal power supply, with local display and remote relay alarm output.

Flexible on-site menu configuration, free switching among double extraction, single extraction+admission control modes without hardware modification, equipped with parameter upload/download function for quick backup and batch configuration.

Applicable Scenarios

Cogeneration heating steam turbine in chemical & papermaking plant, petrochemical multi-extraction self-owned power station turbine, waste heat recovery steam turbine with double extraction and admission, blast furnace gas driven steam expander control system.

Operation and Maintenance Instructions

Install away from inverter, large AC contactor and strong electromagnetic interference source; prevent oil mist, moisture and corrosive gas from entering cabinet interior.

Periodically tighten rear wiring terminals to avoid loose connection leading to speed signal drift and irregular valve action.

Replace spare controller with original 9907-167 only; reload saved unit configuration parameters after replacement before trial startup.

When regulation abnormal occurs, firstly inspect field actuator wiring and magnetic pickup installation clearance; check panel fault codes to locate internal module fault after confirming external circuit normal.