Setting The Overtravel Limit Function - YASKAWA E-II Series User Manual

8 Operation

8.3.3 Setting the Overtravel Limit Function

8.3.3 Setting the Overtravel Limit Function

The overtravel limit function forces movable machine parts to stop if they exceed the allowable range of motion
and turn ON a limit switch.
(1) Connecting the Overtravel Signal
To use the overtravel function, connect the following overtravel limit switch input signal terminals.
Type Name
Input P-OT
Input N-OT
Connect limit switches as shown below to prevent damage to
the devices during linear motion.
Rotation in the opposite direction is possible during overtravel.
For example, reverse rotation is possible during forward over-
travel.
IMPORTANT
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.
When using the servomotor on a vertical axis, the workpiece may fall in the overtravel condition.
To prevent this, always set the zero clamp after stopping with Pn001 = n.
Refer to (3) Selecting the Motor Stop Method When Overtravel is Used in this section.
(2) Enabling/Disabling the Overtravel Signal
A parameter can be set to disable the overtravel signal. If the parameter is set, there is no need to wire the over-
travel input signal.
Parameter
Pn50A
Pn50B
• Applicable control methods: Speed control, position control, and torque control
• After changing these parameters, turn OFF the main circuit and control power supplies and then turn them ON again to
enable the new settings.
* A parameter can be used to re-allocate input connector number for the P-OT and N-OT signals. Refer to 7.3.2 Input Cir-
cuit Signal Allocation.
8-20
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Connector Pin
Number
ON (low level)
CN1-42
(Factory setting)
OFF (high level)
ON (low level)
CN1-43
(Factory setting)
OFF (high level)
n.2
Inputs the Forward Run Prohibited (P-OT) signal from CN1-42. (Factory setting)
n.8
Disables the Forward Run Prohibited (P-OT) signal. (Allows constant forward rotation.)
n. 3
Inputs the Reverse Run Prohibited (N-OT) signal from CN1-43. (Factory setting)
n. 8
Disables the Reverse Run Prohibited (N-OT) signal. (Allows constant reverse rotation.)
Setting
Forward rotation allowed. Normal operation status.
Forward rotation prohibited. Forward overtravel.
Reverse rotation allowed. Normal operation status.
Reverse rotation prohibited. Reverse overtravel.
Servomotor
CAUTION
Meaning
Meaning
Motor forward rotation direction
SERVOPACK
CN1
Limit Limit
P-OT
switch switch 42
N-OT
43
1 .