WOODWARD 9907-149 digital speed regulator

9907: Product series prefix, representing Woodward’s classic "digital small-sized speed regulator series". Distinguished from large-scale PLC speed control systems (e.g., Series 505), this series focuses on the compact, low-cost speed control needs of small and medium-sized machinery.

149: Function and configuration code, indicating that this model is a "basic version digital speed regulator". It supports single-unit speed control and basic digital input/output, without an extended communication module (some suffix-variant models such as 9907-149-R represent configurations with redundancy; refer to the original manufacturer’s manual for details).

Internal combustion engine field: Stable speed control of diesel generators (100-1000kW) and gas engines (e.g., biogas power generation, natural gas power generation) to ensure accurate output of power generation frequency (50/60Hz).

Turbine machinery field: Speed regulation of small steam turbines (power ≤ 5MW) and industrial water turbines, adapting to the speed requirements of driven loads such as fans and pumps.

Parallel operation scenarios: Supports "masterless parallel connection" of 2-4 units of the same model to achieve uniform load distribution (e.g., active power balance when diesel generators are connected in parallel for power supply).

Emergency power scenarios: Speed control of marine emergency generators and backup power units on oil platforms, meeting the requirements of rapid startup and stable operation under emergency working conditions.

PID Speed Regulation: Built-in adaptive PID algorithm that automatically adjusts proportional (P), integral (I), and derivative (D) parameters according to load changes (e.g., sudden load addition/reduction of generators) to avoid speed overshoot or oscillation. For example, when a generator suddenly adds 50% rated load, the maximum speed deviation is ≤ 5% of the rated speed, and the recovery time is ≤ 2s.

Speed Reference Modes: Supports switching between two reference modes (via digital input or software settings):

Idle Speed Control: Supports idle mode (e.g., after engine startup without load, automatically maintaining low-speed operation to reduce fuel consumption). The idle speed can be set to 30%-50% of the rated speed.

Masterless Parallel Connection: 2-4 units controlled by the 9907-149 can be connected in parallel via "droop characteristics" without coordination from a master controller. Each unit bears the load proportionally according to its own speed deviation, with a load distribution error ≤ ±5% (under rated total load).

Load Limitation: Allows setting of a maximum load limit (e.g., 110% of the generator’s rated power) to prevent overloading of the unit. It supports load shedding (triggered via digital input, e.g., shedding load first before emergency shutdown to avoid sudden speed rise).

Speed Protection:

Hardware Fault Protection: Monitors power voltage, actuator drive circuits, and speed sensor signals. If a fault is detected (e.g., sensor disconnection, actuator short circuit), it immediately enters "safe mode" (maintains the current actuator state or switches to manual mode), while turning on the fault indicator light and outputting an alarm signal.

Fault Diagnosis: Built-in fault code storage function (can store the latest 10 fault records). Fault types (e.g., "E01-Speed Sensor Fault", "E05-Power Undervoltage") can be read via the panel indicator light flashing pattern or dedicated software, facilitating maintenance personnel to quickly locate problems.

Local Operation: Equipped with 4 function buttons (setting, confirmation, increase/decrease, reset) and a 3-digit LED nixie tube, allowing on-site speed setting and viewing of operating parameters (e.g., current speed, load percentage, fault code) without connecting to a computer.

Software Configuration: Supports connection to the speed regulator via Woodward’s dedicated software (e.g., ProTech PC Tool) (through RS-232 interface) for refined parameter configuration (e.g., PID parameters, protection thresholds, input/output logic), fault record export, and firmware upgrade.

Parameter Locking: Supports password locking to prevent on-site misoperation from modifying key parameters (e.g., PID adjustment coefficients, overspeed protection thresholds).

Compatible Power Machinery:

Compatible Sensors: Woodward Series 7000 magnetoelectric speed sensors (e.g., 70091-1000-001), third-party Hall effect sensors (outputting 5V pulse signals).

Compatible Actuators: Proportional solenoids (e.g., Woodward Series 2301A), stepper motor throttle drives, hydraulic servo valves (requiring matching drive modules).

Installation Requirements:

Calibration and Debugging:

Periodic Maintenance: