Handling The Forward Rotation Limit And Reverse Rotation Limit - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
7.3

Handling the Forward Rotation Limit and Reverse Rotation Limit

The concept of the forward rotation limit and that of the reverse rotation limit are described. Suppose that limit
switches are located as shown in the figure below.
Reverse rotation limit 2
(servo amplifier side)
Servomotor
Limit
Forward
Servo rotation limit 2,
amplifier reverse
rotation limit 2
Forward
rotation limit 1,
PLC
reverse
rotation limit 1
Software limit (upper)
Software limit (lower)
*1. Sudden stop or deceleration stop can be selected with Ver.1.20 or later.
Note
• The 20SSC-H does not have a terminal for connecting the forward or reverse rotation limit switch.
Connect the forward and reverse rotation limit switches to the PLC and/or servo amplifier.
• Provide the forward/reverse rotation limit when using the DOG search function in a DOG type mechanical
zero return. The DOG search function operates, even if the forward/reverse rotation limit are provided in
either a PLC or the servo amplifier side.
How to restart after the limit switch is activated
When the limit switch is activated, the work piece decelerates to stop, and a limit error occurs.
The work piece cannot move to the activated limit-switch side. Use the JOG operation in opposite direction or
the manual pulse generator in the opposite direction to avoid the limit error.
Forward rotation limit input
Reverse rotation JOG operation or reverse rotation
manual pulse generator operation is valid.
82
Reverse rotation limit 1
(PLC side)
LSR
Reverse rotation
Stopping
action
Deceleration
Specify the action limit so that no damage is caused to the machine that
*1
decelerates to stop after activation of the limit switch.
to stop
Provide at positions so that the limit switch is activated before forward
Deceleration
rotation limit 2 or reverse rotation limit 2 connected with the servo
*1
to stop
amplifier.
Operation limit based on the current address that is effective after
Deceleration
mechanical zero return.
*1
Specify at addresses where activation is caused before the forward
to stop
rotation limit 1 or reverse rotation limit 1 connected with the PLC.
Operation speed
ON
OFF
7 Before Starting Positioning Operation
7.3 Handling the Forward Rotation Limit and Reverse Rotation Limit
Forward rotation limit 1
(PLC side)
LSF
Forward rotation
Description
→ For details, refer to Section 7.5
Deceleration to stop
However, immediate stop is caused during
operation with the manual pulse generator.
Forward rotation JOG operation or forward
rotation pulse generator operation is invalid.
Forward rotation limit 2
(servo amplifier side)
Reference
Subsection
7.3.1
Subsection
7.3.2
Subsection
7.3.3