Model Interpretation

9907 = designation for the entire 505E controller series;

164 = variant code for 24VDC powered unit configured with dual inlet/extraction control loops and full standard I/O allocation.

Technical Specifications

Electrical Specifications

Power Supply: 24VDC (rated 1A)

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

Overall Dimension: 356×280×102mm, Net Weight: 4.13kg, panel cutout flush mounting

Ingress Rating: Front panel IP54; rear wiring terminal area IP30

I/O Configuration

Analog Input: Magnetic pickup speed signal, valve position feedback, 4–20mA process variable acquisition

Analog Output: 6-channel 4–20mA for operating parameter transmission

Actuator Drive Output: Dual servo drive channels for direct electro-hydraulic actuator driving

Discrete Signals: Multiple digital inputs; 8-channel isolated relay dry-contact outputs

Control Modes

Features isochronous speed control, droop regulation and parallel unit load sharing; integrated functions include overspeed protection, startup/shutdown sequencing, extraction pressure closed-loop control and composite inlet flow regulation.

Interface and Communication Configuration

Front Panel: 2-line × 24-character LCD display plus membrane keypad and dedicated red emergency stop button for on-site parameter modification and fault interrogation.

Rear Terminal Strip: Hardwired terminals for speed pickup, actuator wiring, analog and discrete I/O field connections.

Communication: Native Modbus RTU serial port for DCS/PLC uplink, enabling remote parameter access, modification and fault reporting.

Core Functions

Full automatic governing across turbine startup, ramp-up, synchronization, grid paralleling and load operation with coordinated main and extraction valve dual-loop control.

Real-time closed-loop regulation for rotational speed and extraction pressure plus valve stroke limiting and overspeed interlock protection logic.

Embedded self-diagnostics triggering fault alert contacts upon pickup open-circuit, output short-circuit or abnormal supply voltage conditions.

Software-free local setup via front-panel menus, adaptable to single/double extraction and split-range valve arrangements for multiple turbine configurations.

Applicable Scenarios

Waste heat recovery turbine generators, extraction turbines for captive chemical power plants, blast furnace gas turbines, small-scale steam turbine gensets and steam expander governing systems.

Operation and Maintenance Guidelines

Shield the controller from moisture, oil mist and dust ingress; isolate installation from high EMI sources such as variable frequency drives and heavy-duty contactors.

Periodically retighten rear terminal lugs to eliminate loose connections causing speed or stroke signal drift.

Replace only with identical 9907-164 spare unit; reload unit-specific configuration post hardware replacement.

Troubleshoot actuator loop faults by first inspecting field cabling; retrieve onboard fault codes from front panel for controller fault diagnosis.