3 Product Description
6
Version: 1.2.0
MP45E
M-605 High-Precision Linear Stage
3.4
Technical Features
3.4.1
Linear Scale Position Encoder
M-605 stages use linear scale position encoders with 0.1 µm resolution for position detection.
Maximum velocities of 50 mm/s can be achieved.
The linear encoder is mounted in the center of the stage, close to the ballscrew drive to prevent
possible cosine error. The linear encoder measures the actual position of the moving carriage
directly, thus eliminating drivetrain errors such as non-linearity, backlash or elastic
deformations.
The encoder is based on an optical grating and a non-contacting read head with integrated
signal conditioner and interpolator.
3.4.2
PWM Amplifiers
For maximum dynamic performance, the DC servo-motors are driven by high-efficiency PWM
power amplifiers integrated into the stages. An external line-power power supply (order
number: M-500.PS) is provided to supply the built-in amplifiers directly. This architecture allows
high torque and high velocities while loading the motor controller with control signals only. The
actual power is provided by the external supply.
3.4.3
Travel Limit Sensors
M-605 stages are protected against running into the hard stop by double-level magnetic limit
sensors (Hall-effect sensors with TTL drivers) at each end of travel.
The
inner limit sensors
(N1 at the negative-travel end and P1 at the positive-travel end) work
with the controller's limit sense input lines. The TTL output signal is active high.
The
outer limit sensors
(N2 at the negative and P2 at the positive end) work locally, opening a
relay that cuts the motor current. The second-level limit switches provide for fail-safe operation
in case the controller fails to stop the motor when the inner limit sensor is reached.
If the outer limit switch is reached, the stage can not be operated by the controller until the
platform is moved manually. Disconnect the motor cable or set the motor into MOTOR OFF
state before moving the platform back into the current-allowed area via the rotary knob.
3.4.4
Position Reference Signal Sensors
Position Reference Sensors are located approximately in the middle of the operating range and
can be used to reference the absolute position of the stage. Always approach the reference
sensor from the same side to reach the same position.
The reference sensor in M-605 stages provides a static signal level which depends on the
platform position. If the platform is on the “positive side” the reference signal is +5 V, while if
the platform is on the “negative side,” the signal level is 0 V. Most PI motor controllers and
Windows libraries offer the option of starting a search run for the reference point using the
current reference sensor signal to determine the appropriate direction.
The "AutoFindReference" function allows for starting a search run for the reference signal.
Independent at which side relative to the reference position the stage is located, this function
always starts the stage towards the reference position.
Summary of Contents for M-605 Series
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