8.4 Settings for Common Basic Functions8-9 Operation88.4.2 OvertravelIf movable machine parts overtravel and exceed the allowable range of motion, the overtravel limit functionforces the parts to stop by activating the limit switch.For rotating application such as disc table and conveyor, overtravel function is not necessary.In such a case, no wiring for overtravel input signals is required.The overtravel function is not affected by the set value of Pn01E.0 (Motor Type/Application Selection Set-ting).(1) Signal SettingRotation in the opposite direction is possible during overtravel by inputting the reference.(2) Overtravel Function SettingParameters Pn50A and Pn50B can be set to enable or disable the overtravel function.If the overtravel function is not set to use, no wiring for overtravel input signals will be required.∗1. For a SERVOPACK for two axes: CN1-8 (P-OT1), CN1-10 (P-OT2)∗2. For a SERVOPACK for two axes: CN1-9 (P-OT1), CN1-11 (P-OT2)CAUTION• Installing limit switchesFor machines that move using linear motion, connect limit switches to P-OT and N-OT of CN1 as shown below toprevent machine damage. To prevent a contact fault or disconnection from causing accidents, make sure that the limitswitches are normally closed.• Axes to which external force is applied in overtravel.Vertical axes:Occurrence of overtravel may cause a workpiece to fall, because the /BK signal is on, that is when the brake isreleased. Set the parameter (Pn001.1 = 1) to bring the servomotor to zero clamp state after stopping to prevent aworkpiece from falling.Other axes to which external force is applied:Overtravel will bring about a baseblock state after the servomotor stops, which may cause the servomotor to bepushed back by the load’s external force. To prevent this, set the parameter (Pn001.1 = 1) to bring the servomotor tozero clamp state after stopping.For details on how to set the parameter, refer to (3) Servomotor Stopping Method When Overtravel Occurs.8CN17P-OTN-OTLimitswitchServomotor SERVOPACKLimitswitchMotor forward rotation directionNote: For pin numbers of CN1,refer to 7.2.5 I/O Signals.Type Name ConnectorPin Number Setting MeaningInputP-OT Note: For pin num-bers of CN1, refer to7.2.5 I/O Signals.ON Forward run allowed.Normal operation status.OFF Forward run prohibited. Forward overtravel.N-OT ON Reverse run allowed. Normal operation status.OFF Reverse run prohibited. Reverse overtravel.Parameter(Index Number) Meaning WhenEnabled ClassificationPn50A(2110h:1)n.1[Factory setting]Inputs the Forward Run Prohibited (P-OT) signal fromCN1-6*1.After restart Setupn.8 Disables the Forward Run Prohibited (P-OT) signal.Allows constant forward rotation.Pn50B(2110h:2)n.2[Factory setting]Inputs the Reverse Run Prohibited (N-OT) signal fromCN1-7*2.n.8 Disables the Reverse Run Prohibited (N-OT) signal.Allows constant reverse rotation.
