Stall Detection - AGFA CR 30-X Service Manual

Functional Description
6
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Chapter 2 / 12
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Stall Detection

Stall detection =
•
Motor stall (home/end position) detection without the use of additional
sensors
•
Made by evaluation of stepper motor control curve on the motor controller
chip
Advantage compared to home/end position detection via light sensors:
•
Monitoring of motor run not only in home and end position, but also
between home and end position (except acceleration / deceleration time)
•
Less sensors (costs, reliability) and cabling (costs).
How does it work in general:
•
When the stepper motor is accelerating the stall detection is switched off,
as torque differs to much during acceleration.
•
When the motor reaches a stable speed, e.g. after 200 steps, the stall
detection is active for a number of steps, e.g. 5000 steps: The motor
control curve is evaluated by the motor controller chip.
DOCUMENT CONTROL NOTE:
Type 5175/100
Figure 10
CR30-X
DD+DIS150.06E
Edition 1, Revision 0