Model Interpretation

9907: Unified series code for 505E digital governor;

165: AC180~264Vac universal power supply version, triple-loop control specification with dual extraction + admission steam regulation, full standard IO configuration, built-in dual speed/load dynamic control algorithm.

Technical Specifications

Electrical Parameter

Power Supply: AC180–264Vac, 47~63Hz

Operating Temp: -25℃ ~ +65℃; Storage Temp: -40℃~+85℃, Humidity 5%~95%RH non-condensing

Overall Dimension:356×279×102mm, Net Weight≈4.5kg, panel embedded mounting structure

Protection Grade: Front panel IP54/NEMA4 optional, rear wiring terminal IP30

IO Configuration

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

Analog Output:6-channel programmable 4–20mA transducer output

Actuator Drive:2 independent servo drive outputs for double split-range hydraulic actuator

Discrete I/O:8-channel relay dry contact output, multi-point digital switching input for interlock signal

Interface and Communication Configuration

Front Panel: 2-line×24-character LCD display + membrane operation keypad + red emergency stop button for local parameter setup, fault inquiry and manual test

Rear Terminal Block: Screw-type fixed terminals for speed probe, actuator, AI/AO and discrete signal hard wiring

Communication: Standard Modbus RTU serial port, wired connection with DCS/PLC for remote parameter read-write and fault alarm upload

Core Function

Full automatic control of turbine startup, speed rise, grid synchronization, load adjustment and shutdown; realize three closed-loop regulation: rotating speed, dual extraction pressure and admission steam pressure linkage control.

Built-in dual speed/load dynamic control curve, adaptive for grid fluctuation and working condition abrupt change of multi-extraction turbine unit.

Complete overspeed protection logic, valve position upper/lower limit interlock, unit emergency trip control function.

Real-time self-diagnosis for MPU disconnection, actuator circuit short/open, power supply anomaly, with on-panel fault code display and remote relay alarm output.

On-site menu configuration, flexible switching among double extraction, extraction+admission and single extraction turbine control modes without hardware modification.

Applicable Scenarios

Petrochemical factory self-owned power plant double extraction steam turbine, chemical heating supply combined cycle turbine, waste heat power generation multi-extraction turbine, blast furnace gas-driven steam expander genset control system.

Operation and Maintenance Instructions

Install far from inverter, large contactor and strong electromagnetic interference source; avoid oil mist, moisture and corrosive gas entering cabinet inner space.

Periodically tighten rear wiring terminals to prevent loose wiring causing speed signal drift and abnormal valve action.

Replacement spare part must adopt original 9907-165; reload configured turbine parameters after replacement before commissioning startup.

Abnormal regulation fault: first check field actuator wiring and pickup gear clearance; refer panel fault code to locate internal module failure when external circuit is normal.