Technical Features; Encoder; Limit Switches; Reference Point Switch - PI L-509 Series User Manual

3 Product Description
3.8

Technical Features

3.8.1

Encoder

The L-509.x0SD00 models are not equipped with an encoder.
Linear encoder
The L-509.x4AD00 and L-509.xASD00 models are equipped with an optical linear encoder. For
the encoder resolution, refer to the table in the "Specifications" section (p. 47).
Optical linear encoders measure the actual position directly (direct metrology). Therefore,
errors occurring in the drive, such as nonlinearity, backlash or elastic deformations cannot
influence the measurement of the position.
Rotary encoder
The L-509.x0AD10 and L-509.x0DG10 models are equipped with an incremental rotary encoder.
A rotary encoder is implemented at a rotating point in the drivetrain, e.g., the motor shaft.
3.8.2

Limit Switches

The L-509 is equipped with optical 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 stage runs into the hard stop.
See "Limit Switch Specifications" (p. 51) for more information.
3.8.3

Reference Point Switch

The stage is equipped with a direction-sensing reference point switch, which is located at about
the midpoint of the travel range. This sensor sends a TTL signal indicating whether the stage 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.
3.8.4

Integrated PWM Amplifier

The L-509.x0AD10 and L-509.x4AD00 models with direct drive are equipped with a PWM
amplifier ("ActiveDrive concept"). The motor and PWM amplifier are installed in a common case
and thus optimally integrated and shielded. The PWM amplifier only receives the control signals
from the controller, whereas the supply voltage is provided via an external power supply. The
ActiveDrive concept allows high motor power and dynamics at low power loss.
L-509 Stage MP141E Version: 1.1.0 13