Overtravel - YASKAWA SGMJV User Manual

5 Operation

5.2.3 Overtravel

5.2.3 Overtravel

The overtravel limit function forces movable machine parts to stop if they exceed the allowable range of
motion and turn ON a limit switch.
For rotating application such as disc table and conveyor, overtravel function is not necessary. No wiring for
overtravel input signals is required.
• 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 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 with Pn001 = n.
Refer to (3) Motor Stopping Method When Overtravel is Used in this section.
(1) Signal Setting
Type
Input
Rotation in the opposite direction is possible during overtravel by inputting the reference.
5-6
Servomotor
Connector
Name
Pin Number
P-OT CN1-42
N-OT CN1-43
When the servomotor stops due to overtravel during position control, the position error
pulses are held. A clear signal (CLR) input is required to clear the error pulses.
For the clear signal, refer to 5.4.2 Clear Signal.
CAUTION
Motor forward rotation direction
Limit Limit
P-OT
switch switch
N-OT
Setting
ON
OFF
ON
OFF
SERVOPACK
CN1
42
43
1 .
Meaning
Forward run allowed. Normal operation sta-
tus.
Forward run prohibited. Forward overtravel.
Reverse run allowed. Normal operation status.
Reverse run prohibited. Reverse overtravel.