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4.8 Overtravel Function
4-37
Feed Axis
Operation
Connector Pin Numbers for SERVOPACK for One Axis
Connector Pin Numbers for SERVOPACK for Two Axes
(2) Overtravel Function Selection
Parameters Pn50A and Pn50B can be set to enable or disable the overtravel function.
If the overtravel function is disabled, no wiring for overtravel input signals is required.
∗1.
For a SERVOPACK for two axes: CN1-7 (P-OT1), CN1-9 (P-OT2)
∗2.
For a SERVOPACK for two axes: CN1-8 (N-OT1), CN1-10 (P-OT2)
(3) Servomotor Stopping Method Selection When Overtravel Is Used
There are three servomotor stopping methods when overtravel occurs.
• Dynamic brake (DB): The servomotor comes to an immediate stop by short-circuiting the electrical circuits.
If a spindle motor is used, the motor coasts to a stop instead of stopping immediately.
• Decelerate to a stop: Decelerates to a stop by using the emergency stop torque. (This method is recom-
mended.)
• Coasting to a stop: Stops naturally by using the friction of the rotating motor.
There are two possible motor states after the servomotor stops.
• Coast status: The servomotor is stopped naturally due to the rotational friction.
• Zero clamp status: A position loop is formed by using the position reference zero. (This method is recom-
mended.)
The stopping method that is set in Pn001 is used when overtravel occurs.
The factory setting of Pn001 depends on the model.
Refer to
8.2.2 Overtravel
in the
Σ
-V-SD Series User’s Manual
(Manual No.: SIEP S800000 78) for details on
overtravel.
P-OT
CN1-6
N-OT
CN1-7
Axis 1
Axis 2
P-OT
CN1-8
CN1-10
N-OT
CN1-9
CN1-11
Parameter
Meaning
When Enabled
Classification
Pn50A
n.1
(factory setting)
Inputs the Forward Run Prohibited
signal (P-OT) from CN1-6.
*1
After restart
Setup
n.8
Disables the Forward Run Prohib-
ited signal and enables forward
operation at all times.
Pn50B
n.
2
(factory setting)
Inputs the Reverse Run Prohibited
signal (N-OT) from CN1-7.
*2
n.
8
Disables the Reverse Run Prohib-
ited signal and enables reverse
operation at all times.
Pn517
n.
0
Enables the overtravel function.
Immediately
Setup
n.
1
Disables forward overtravel only
(disables the Forward Run Prohib-
ited signal and enables forward
operation at all times).
n.
Disables reverse overtravel only
(disables the Reverse Run Prohib-
ited signal and enables reverse
operation at all times).
n.
Disables the overtravel function in
both directions.