Our scope of supply typically includes equipment, engineering and site supervision. Each kit includes a PLC-based digital control cabinet with touchscreen local operator interface, pilot valve electro-hydraulic interface manifold, and electronic speed and gate position sensors.
The PLC cabinet can be physically mounted and wired by your staff or others using the drawings we provide. During the outage, an experienced Field Service Engineer will be on hand to assist with installation and provide final commissioning and testing services. Click any component below for more details.
The new controller and accessories will reside in a wall-mount control enclosure that includes the following devices:
The touchscreen operates independently and automatically establishes communication with the PLC Governor upon boot-up; no operator intervention is required and system screens are stored in non-volatile memory. HMI programming software and cable are included to allow you to modify or add new screens.
In addition, a door-mounted Emergency Shutdown push button will be provided.
The assembly includes the following devices:
Proportional Control Valve
Enables servomotor control via PLC during normal operation. This high-response valve provides closed-loop control of distributing valve spool position.
Solenoid Shutdown Valve
Enables emergency shutdown independent of the PLC. When de-energized, the solenoid valve causes the distributing valve spool to move fully in the close direction, causing the servomotor to close at the fastest rate allowed by the stop nuts.
A custom manifold for the mounting of valves. Includes shutdown shuttle assembly for independent shutdown via solenoid valve (blocks control flow from proportional valve).
Primary Speed Signal
Primary speed sensing is done via an American Governor Speed Signal Module connected to a generator Potential Transformer. Our high-resolution Speed Signal Module provides one 0-200% analog output for metering and one high-resolution analog output for synchronizing and on-line droop control.
The module is compliant with IEEE 125 “IEEE Recommended Practice for Preparation of Equipment Specifications for Speed-Governing of Hydraulic Turbines Intended to Drive Electric Generators.” Back-up speed sensing is available as an option.
Mounting hardware, signal conditioner and connector will be included.
Mounting hardware and connector will be included.
All hardware and software will be tested completely before leaving our factory.