Functional Features:​ High control accuracy and stability; simple operation; configurable for different turbine applications; critical speed avoidance; speed remote control; overspeed testing; valve position limiting; frequency control; cascade control; auxiliary control; communication capabilities.

Application Scenarios:​ Control of steam turbines driving generators, compressors, or pumps. Suitable for industrial steam turbine applications requiring precise speed and load regulation.

Performance Parameters:​ Speed PID control modes; frequency and unit load relationship management; critical speed range setting with fast ramp rate capability; overspeed protection function.

Material Composition:​ Industrial-grade electronic control enclosure designed for harsh industrial environments.

Structural Features:​ Standard enclosure or bulkhead-mounted enclosure configuration; keypad and display interface; CageClamp terminal blocks; jumper options for configuration; fuse location; shielded wire connections; RS-232, RS-422, and RS-485 communication interfaces.

Working Principle:​ The 505 accepts speed signals from two magnetic pickups (SE) monitoring turbine speed (frequency signals), compares with internal speed setpoint, and through speed PID amplifier action, outputs 4-20 mA manipulation signals. These signals are sent to an electrohydraulic converter (IH) which converts to secondary oil pressure signal (1.5-4.5 bar). The secondary oil drives the servo cylinder (1910) to control the regulating valve (0801) opening, adjusting steam intake to regulate turbine output and maintain speed stability at the setpoint.