Hardware Stroke Limit Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

Hardware stroke limit function

WARNING
• When the hardware stroke limit is required to be wired, ensure to wire it in the negative logic using b-contact. If it is set in positive logic using a-contact, a
serious accident may occur.
In the "hardware stroke limit function", limit switches are set at the upper/lower limit of the physical moveable range, and the
control is stopped (by deceleration stop) by the input of a signal from the limit switch.
Damage to the machine can be prevented by stopping the control before the upper/lower limit of the physical moveable range
is reached.
The hardware stroke limit is able to use the following signals. (Page 430 [Pr.116] to [Pr.119] FLS/RLS/DOG/STOP signal
selection)
• External input signal of servo amplifier
• External input signal via CPU (buffer memory of the Motion module)
Control details
The following drawing shows the operation of the hardware stroke limit function.
■External input signal of servo amplifier
For the operation when the servo amplifier stroke limit is detected, confirm the specifications of the servo amplifier to be used.
The following shows the case of MR-J5(W)-G use.
Mechanical
stopper
*1 Set the following servo parameters properly.
- Set "1: Input from controller" in the servo parameter "Function selection D-4 "sensor input method selection (PD41.3)". If not, an error
"Servo parameter invalid" (error code: 1DC8H) occurs, and the controller rewrites "Function selection D-4 "sensor input method
selection (PD41.3)" to "1: Input from controller". The servo parameter is enabled after resetting the servo amplifier.
- Assign the LSP/LSN signal in servo parameters "Input device selection 1 to 3 (PD03 to PD05)".
*2 The signal to be wired differs depending on the setting of servo parameter "Travel direction selection (PA14)".
Setting value of "Travel direction selection (PA14)"
0: Forward rotation (CCW) with the increase of the positioning address
1: Reverse rotation (CW) with the increase of the positioning address
*3 Stop processing is carried out in the Motion module.
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Lower limit
Control range of Motion module
Movement
Start
direction
Deceleration stop
at lower limit switch
detection *3
Lower limit switch *2
search engine
Upper limit
Movement
Start
direction
Deceleration stop
Servo amplifier
at upper limit switch
detection *3
Upper limit switch *2
Signal name of servo amplifier
Lower limit
LSN
LSP
Mechanical
stopper
*1 Motion module
CC-Link IE
TSN Network
Upper limit
LSP
LSN
8 CONTROL SUB FUNCTIONS
8.3 Functions to Limit the Control
8
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