Design and function
42/68-165-EN RHD250 ... 4000 11
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2 Design and function
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M00368
Fig. 2: RHD250...RHD4000 (illustrations may differ from actual installation)
1 Hand wheel crank
2 Hand wheel
3 Ball-and-socket joint
4 Damper lever
5 Output shaft
6 Adjustable stops
7 Servo motor
8 Hand wheel release
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Functionality
Compact actuator for the operation of final control elements with preferably 90° rotary
movement such as flaps, cocks, etc.
The torque is transferred via a lever / linkage bar assembly or the actuator is directly coupled to
the cock flange.
A special power electronic unit controls the actuator. The electronic unit serves as the interface
between actuator and control system.
During continuous positioning the power electronic unit varies the motor torque steplessly until
the actuator force and the restoring process forces are balanced. High response sensitivity and
high positioning accuracy with short positioning time ensure an excellent control quality and a
long actuator life.
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