E1 Series Servo Drive User Manual Basic Function Settings Before Operation
HIWIN MIKROSYSTEM CORP. 6-11
6.7 Overtravel function
For operational safety, machine will restrict the travel distance of its moving parts by means of hardware
devices such as end stops and limit switches as well as software signals such as software limits. E1
series servo drive provides overtravel signals (P-OT and N-OT signals) which can be used with limit
switches for protecting the machine. (Note: The installation positions of limit switches must be adjusted
according to the motor stopping method as P-OT or N-OT signal is triggered.)
Figure6.7.1
Note:
If P-OT or N-OT signal is used for homing, please adjust software limits.
When overtravel function is not needed for rotating application or conveyor, wiring for overtravel function
is not required. The related parameters of overtravel function are described as below.
Ensure normally closed contacts (b contacts) are used for limit switches to avoid accident caused by poor
contact or disconnection. The polarity of input pins for overtravel signals can be user-defined.
When motor is used in vertical axis, load could fall if overtravel occurs. To prevent load from falling, Pt001 must
not be t.0 (The motor runs freely after the motor decelerates to a stop.).
Though the motor goes into STO state after overtravel occurs and the motor stops, the motor could still be
moving due to external force from the load side. To avoid the above situation, please set Pt001 to t.1.
When overtravel function is enabled, the servo drive can still receive pulse commands from the controller.
When overtravel function is disabled, please be aware that if there is excessive position deviation between the
actual position and the command position since the motor may operate at high velocity.
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