3 Product Description
L-220 Linear Actuator
MP149E
Version: 1.3
9
3.7
Technical Features
3.7.1
Rotary Encoder
The models with DC motors are equipped with a rotary encoder. A rotary encoder, also called
an incremental or incremental rotary encoder, is implemented at a rotating point in the
drivetrain, e.g., the motor shaft. To determine the relative position, the controller counts the
encoder signals, the so-called impulses.
3.7.2
Limit Switches
The L-220 is equipped with noncontact, Hall-effect limit switches.
Each limit switch sends its signal to the controller on a dedicated line. The controller then stops
the motion. If the controller does not stop the motion in time, the linear actuator runs into the
hard stop.
See "Limit Switch Specifications" for more information (p. 31).
3.7.3
Reference Point Switch
The L-220 is equipped with one direction-sensing reference point switch that is located at about
the midpoint of the travel range. This sensor transmits a TTL signal that indicates whether the
linear actuator is on the positive or negative side of the reference point switch.
See the controller user manual and/or associated software manuals for the commands that
make use of the reference point signal.
For more information, see "Reference Point Switch Specifications" (p. 31).