Stroke Limit Function [G] [Wg]; Explanation Of The Stroke Limit Signal Names; Setting Methods Of Functions - Mitsubishi Electric MR-J5 Series User Manual

3.4

Stroke limit function [G] [WG]

The stroke limit function is a function that limits the travel distance of servo motors. On a system configuration where the
movable range is limited, wire the stroke limit signal and use this function to prevent machine damage due to a collision.
When the stroke limit signal is detected, a warning regarding the detected signal occurs, and the servo motor stops based on
the stop method described in this section.
When a system configuration without the limited movable range is used and therefore the stroke limit function is not
necessary, set the stroke limit signal for always on.
• The stroke limit signal cannot be used in the torque mode. In the torque mode of the linear servo motor and
the direct drive motor, the stroke limit signal can be used only at the time of magnetic pole detection.
Precautions
• The stroke limit signal is the signal for normally closed contact. Limit is released with on (shorted), and limit is in progress
with off (open).
• Depending on the stop method setting of the stroke limit and the commands from the controller, the stroke limit signal will
be detected during operation, and stopping the servo motor may result in erasing the home position. If the home position is
erased, perform homing again.

Explanation of the stroke limit signal names

There are two types of the stroke limit signals: one is FLS (Upper stroke limit)/RLS (Lower stroke limit) and the other is LSP
(Forward rotation stroke end)/LSN (Reverse rotation stroke end), and each signal characteristic is shown in the following
table. The signal names differ depending on whether the stroke limit signal is used on the controller or on the servo amplifier.
Use the appropriate signal names for each system configuration.
To wire limit switches to the servo amplifier, wire the limit switch installed in CCW direction to LSP (Forward rotation stroke
end), and wire the limit switch installed in CW direction to LSN (Reverse rotation stroke end).
To wire limit switches to the controller, wire the limit switch installed in the increasing direction of the positioning address to
FLS (Upper stroke limit), and wire the limit switch installed in the decreasing direction to RLS (Lower stroke limit). Then, input
the signals from the controller.
Name Symbol
Upper stroke limit FLS
Lower stroke limit RLS
Forward rotation stroke end LSP
Reverse rotation stroke end LSN

Setting methods of functions

Refer to the following table, and make the appropriate settings for the system configuration.
Item
When wiring the limit switch to the servo amplifier
When wiring the limit switch to equipment other than the servo amplifier
When setting the movable range with the position data
When the movable range is not limited
Purpose of the signal
The limit signal which suppresses the operation in the positioning address increasing direction with regard to the
command from the controller
The limit signal which suppresses the operation in the positioning address decreasing direction with regard to the
command from the controller
The limit signal which suppresses the operation in the servo motor CCW direction or in the linear servo motor
positive direction
The limit signal which suppresses the operation in the servo motor CW direction or in the linear servo motor
negative direction
Reference
Page 74 When wiring the limit switch to the servo amplifier
Page 75 When wiring the limit switch to equipment other than the servo
amplifier
Page 76 When setting the movable range with the position data
Page 76 When the movable range is not limited
3 BASIC FUNCTION
3.4 Stroke limit function [G] [WG]
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