Operational Considerations
3
Operational Considerations
3.1
PWM Amplifiers
The M-403.xPD stages feature a DC servo-motor with a high-efficiency PWM
amplifier mounted side by side. This ActiveDrive™ system provides
maximum dynamic performance. An external plug-in power supply
(M-500.PS) is provided to supply the built-in amplifier. This architecture
allows high torque and high velocities while loading the motor controller with
control signals only.
3.2
Limit Switches
All M-403 positioners are equipped with non-contact, Hall-effect limit
switches (with TTL drivers).
Each limit switch sends an overtravel signal on its own dedicated line to the
controller. It is the controller that is then responsible for stopping the motion.
If it does not do so in time, the positioner will run into the hard stop.
On stepper-motor versions, limit switch outputs are active low, on other
versions, active high.
!
CAUTION
Crashes can cause irreparable damage. Do not disable limit switches in
software. Test limit switch operation at low speeds. Stop system if
necessary. Do not let it run against a hard stop.
Limit Switch Specifications:
Type:
magnetic (Hall-effect) sensors
Supply.voltage
+5 V / GND, supplied by the motor controller through the motor
connector.
Signal output:
TTL level
Sink / Source capab.
20 mA at 18°C
Signal logic (stepper motors)
active low; normal operation: high, limit sensor reached: low
Signal logic (DC-motors):
active-high; normal motor operation: low, limit sensor reached: high
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M-403 MP 73E Release 2.0.1 Page
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