Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors - Manual (Page 96)

4 Operation
4.2.3 Overtravel
4-6
4.2.3 Overtravel
The overtravel limit function forces the linear servomotor to stop when movable machine parts exceed the
allowable range of motion by turning ON a limit switch.
(1) Signal Setting
Movement in the opposite direction is possible during overtravel by inputting the reference.
(2) Overtravel Displays
The following will be displayed on the panel display on the front of the SERVOPACK if overtravel occurs.
CAUTION
• Installing Limit Switches
Connect limit switches as shown below to prevent damage to the devices during linear motion.
It is recommended using normally closed contacts for the limit switches to ensure safe operation in the event of a
faulty contact or a disconnection in the contact.
• When using the linear servomotor on a vertical axis
The workpiece may fall in the overtravel condition because the /BK signal is ON to release the brake.
To prevent this, always set the zero clamp after stopping the linear servomotor with Pn001 = n.††1†.
Refer to (4) Motor Stopping Method When Overtravel is Used in this section.
Limit
switch
Linear Servomotor
SERVOPACK
42
CN1
43
N-OT
P-OT
Limit
switch
Forward direction
Type Name
Connector
Pin Number
Input Status Meaning
Input
P-OT CN1-7
ON
Forward run allowed. Normal operation sta-
tus.
OFF Forward run prohibited. Forward overtravel.
N-OT CN1-8
ON Reverse run allowed. Normal operation status.
OFF Reverse run prohibited. Reverse overtravel.
Forward Overtravel (P-OT)
Status
display
Forward and Reverse Overtravel
Reverse Overtravel (N-OT)
Status
display
Status
display