Design And Function; Design; Principle Of Operation - ABB LME series Operating Instructions Manual

LME / RSD10 / RSD20 / RSD50 / RSD100 (Contrac) ELECTRICAL LINEAR ACTUATOR | OI/LME/RSD10/100-EN REV. E

2 Design and function

Design

1 Cover (LME620-AI, only)
2 Handwheel
Figure 1: LME120 (illustrations may differ from actual installation)
1 Control motor
2 Handwheel
3 Thrust rod
Figure 2: RSD (illustrations may differ from actual installation)
Change from two to one column
3 Thrust rod
4 Commissioning and service field
(ISF), (LME620-AI)

Principle of operation

Actuator for the operation of final control elements with
preferably linear movement. The thrust rod transfers the force
directly to the final control element.
A special electronic unit controls the actuators. The special
electronic unit serves as the interface between actuator and
control system.
During continuous positioning, the electronic unit varies the
motor torque steplessly until the actuator force and the control
valve force are balanced. High response sensitivity and high
positioning accuracy with short positioning time ensure an
excellent control quality and a long actuator life.
5