FAQ: In a vertical axis application, the motor trips the overtravel switch and coasts to the hard stop. What might be the cause?
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The SGDH servopack has the ability to control the stop mode when an overtravel is tripped (if overtravel switches are wired into the SGDH as recommended). The default method of stopping is to disable the motor and allow the dynamic brake to stop the motor. This method works very well in most horizontal applications, but vertical applications require a different method.
When using an MP940, the SGDH overtravel function will disable the motor, even if the MP940 did not execute the disable servomotor block. In this mode, the motor will then continue to coast, and the MP940 is not able to apply torque to stop the motor (because it is not enabled). In this example, it is better to change the overtravel method to keep the motor enabled when an overtravel is tripped. This can be done by setting the overtravel stop mode Pn001.1 to 1 (default is 0). This change allows the MP940 to bring the motor to a controlled stop.
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