Controls
Two control systems provide operational control for any test of turboshaft gas turbine engines
VAROC Air Dynamometer customers can choose between two types of control depending on their application. Both systems control the load imposed on a gas turbine engine by varying the airflow allowed to pass through the dynamometer. They do this by directly controlling the stepper motor drive of the dynamometer's shroud subsystem. Both control systems include all cabling to directly interface to dynamometer instrumentation.
Manual Control System
- Open loop control by engine operator
- Lower cost
- Single-axis, 5-position joystick provides manual control of the speed and direction of shroud movement
- Increases or decreases load at two selectable rates of speed
- Digital indicator shows current shroud position
- 11 inch (280 mm) operator panel typically mounts next to engine power lever
- Used by 95% of dynamometer operators
- Configurable to any AC voltage worldwide
Automatic Control System
- Closed-loop control based on measured torque, speed, or engine power lever angle
- Feedback modulates shroud position
- Built-in over-speed, over-torque, and over-temperature detection with selectable limits
- PC-based system
- Touch-screen operator interface
U.S. Patent Nos. 4744724, 5345827, 5426986
VAROC is a registered trademark of NREC.
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