I. Product Overview

8290-191 belongs to the Woodward EPG (Electrically Powered Governor) fully electric speed control series. It is an original product from the United States, a mechanical hydraulic speed control upgrade model, a speed controller specifically for small steam turbines, diesel/gasoline generator sets, compatible with the 2301A system architecture, equipped with power drive direct connection EPG actuator, without the need for an external power amplifier board, commonly used spare parts for the renovation of old units in oilfield compressors and self-owned power plants.

Key Electrical Parameters Table

Project Specifications

Power supply DC 20～32V (nominal 24VDC), maximum power consumption of the entire machine is 95W, front-end 10A slow-blow fuse, matching power supply with a capacity of ≥ 5A output

Speed measurement input MPU magnetic speed sensor, input ≥ 1.5Vrms, speed measurement frequency covers 0～12000Hz, set speed 0～10000RPM adjustable

Remote setting 4～20mA / 0～5VDC analog speed control command, connected to DCS, PLC for remote speed control

Adapter for actuators Original factory 512, 524, 1712, 1724 type EPG electric actuators (direct drive throttle / valve)

Environmental temperature range -40℃～+75℃ operation, -40℃～+85℃ storage, 0～95% RH without condensation

Size and weight 120×80×160mm, net weight ≈ 0.77kg; DIN rail + panel dual installation, protection IP20

Speed control accuracy Steady-state control error ±0.1%, closed-loop response < 10ms

Communication RS485 Modbus-RTU bus networking, multi-machine load distribution in parallel

Core control functions

Dual mode speed control switching

Isochronous mode: single machine isolated network constant frequency operation, constant speed;

Droop mode: grid-connected droop control, multiple units parallel to evenly distribute load, can be extended with 9907-173 load board to expand the parallel machine capacity.

Start fuel limit: factory programmable upper limit of start fuel quantity, cold machine start anti-damp cylinder, overspeed runaway protection.

High and low speed over-limit interlock: no-potential dry contact alarm output for under-speed / over-speed,联动 the unit shutdown circuit.

Dual dynamic parameter hardware toggle： local switch to switch the fast-slow response curve， suitable for gas engines / diesel engines / small steam turbines with different inertia conditions. IV. Applicable Scenarios

Small industrial steam turbines, diesel/gasoline backup power generation units, oilfield natural gas compressors, ship main and auxiliary engines, and the retrofit and replacement of old hydraulic speed control systems for power stations of refineries.