BENTLY 128229-01 monitoring card

BENTLY 128229-01 monitoring card

Technical data of product parameters

Steam turbines are used in many electrical power generation plants. The electrical 128229-01
load on a steam turbine’s electric generator fluctuates as the electric power
consumption increases or decreases. The Digital Electro-Hydraulic (DEH) control
system provides turbine control to adjust steam turbine shaft rotational speed in
response to varying electric generator loads. Very large amounts of force are
required to move valves on large turbines. Therefore, an interposing device is
required between the DEH control system and the controlled valves.
The Ovation Servo Driver module provides an interface between an Ovation
Controller and an electro-hydraulic servo valve actuator. Each controlled turbine 128229-01
valve is connected to an electro-hydraulic actuator (servo-motor). A servo-motor is
a fluid operated piston. Admission of high pressure hydraulic fluid to the piston
cylinder is regulated by a smaller pilot valve. The pilot valve passes hydraulic fluid
underneath the piston to raise it and the controlled valve, or it diverts hydraulic fluid
to the upper side of the piston to lower it and the controlled valve.
A valve position set point is maintained by the Ovation Servo Driver Electronics
module. The set point is normally altered by the Ovation Controller via the I/O bus.
Inside the Electronics module, a microcontroller provides closed loop proportionalplus-integral (PI) control for real time valve position control.The valve position set point causes the Servo Driver module to generate an output 128229-01
control signal that drives the electro-hydraulic servo valve actuator coil. The
feedback loop is closed with the valve’s position measurement being obtained from
a DC-LVDT or an AC-LVT that is mounted on the valve stem.
The electronics module will interface two Electro-Hydraulic (EH) actuators in the
field. The module provides two independent channels that are electrically isolated
from each other.
The Servo Driver Module is NOT applicable for CE Mark Certified Systems.

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Introduction to main products

Focus on DCS, PLC, robot control system and large servo system.

Main products: various modules/cards, controllers, touch screens, servo drives.

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Main brands include ABB Bailey, GE/FANC, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, Emerson EMERSON, OVATION, MOTOROLA, XYVOM, Honeywell HONEYWELL, Rexroth, KUKA, NI, DEIF, Yokogawa, Woodward WOODWARD, Ryan, Schneider SCHNEIDER, Yaskawa, Moog MOOG, PROSOFT and other brands

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