Model Interpretation

9907: 505E overall series code; 164: Low-voltage 24VDC power supply, dual-loop control version with extraction steam and inlet steam, standard with full IO points configuration. Technical Specifications

Electrical Specifications

Power Supply: DC24V (rated 1A)

Operating Temperature Range: -20℃ to +70℃, Storage -40℃ to +85℃, Humidity 5% to 95% RH without condensation

Overall Size: 356×280×102mm, Net Weight 4.13kg, Embedded on the panel (with mounting holes for wall mounting)

Protection Grade: Front panel IP54, Back panel wiring terminals IP30

IO Point Configuration

Analog Input: Speed magnetic probe input, valve position feedback, 4–20mA process parameter acquisition

Analog Output: 6 channels of 4–20mA (operating condition transducer output)

Actuator Output: 2 channels of servo drive output (direct drive electro-hydraulic actuator)

Switching Quantity: 8 channels of relay non-polarized contact outputs, multiple DI switching quantity inputs

Control Mode

Supports equal frequency control, deviation control, unit parallel load distribution, has overspeed protection, start-stop sequential control, extraction steam pressure closed-loop, inlet steam flow composite regulation.

Interface and Communication Configuration

Front panel: 2-line × 24-character LCD display + film operation keys + red emergency stop button, local parameter setting, fault viewing;

Back panel terminal block: speed probe, actuator, AI/AO, switching quantity hard-wired terminals;

Communication: Standard Modbus RTU serial port, can be connected to DCS/PLC upper-level monitoring system, remote reading and writing of parameters, fault upload. Core function

The steam turbine can achieve full-process automatic speed regulation for start-up, shutdown, speed increase, grid connection, and load carrying. It features dual-loop linkage control of the main steam valve and the extraction steam valve.

Real-time closed-loop speed control, closed-loop extraction steam pressure control, valve position limit control, and overspeed protection logic interlock.

Built-in fault self-diagnosis, automatic alarms for probe disconnection, output short circuit, and abnormal power supply, and fault contact output.

On-site configuration without software, with flexible adaptability to single extraction steam / double extraction steam, and staged valve control for various types of steam turbine models. Applicable scenarios

Waste heat power generation steam turbine, chemical self-owned power station extraction steam turbine, blast furnace gas turbine, small steam turbine generator set, steam expansion machine speed control system.

Operation and maintenance instructions

Avoid water vapor, oil stains and dust from entering the panel. Keep it away from frequency converters, high-power contactors and strong electromagnetic interference sources;

Regularly tighten the back wiring terminals to prevent loosening and resulting in drift of speed / valve position signals;

When replacing spare parts, prefer the same model 9907-164. After replacement, re-load the group configuration parameters;

For actuator circuit faults, prioritize checking the servo wiring. For controller faults, you can check the fault code on the panel for traceability.