Machine Opr Method - Mitsubishi Electric MELSEC iQ-R-RD75P4 User Manual

Machine OPR method

In the machine OPR, the method by which the machine OP is established (method for judging the position of the OP and the
completion of the machine OPR) is specified according to the configuration and application of the positioning system.
The following table shows the seven methods provided as the OPR methods. The OPR method is one of the setting items of
the OPR parameter and set in [Pr.43] OPR method.
[Pr.43] OPR Operation
method
Near-point dog method The deceleration starts on the rising edge of Near-point dog. (The speed is reduced to [Pr.47] Creep speed.)
After Near-point dog turns off, the workpiece stops at the first input of zero signals
deviation counter clear output is completed.
The position is set as an OP.
Stopper method 1 The point where a stopper is placed is set as an OP.
After the deceleration starts on the rising edge of the near-point dog, the machine presses the workpiece against the stopper at the
speed set in [Pr.47] Creep speed and stops.
After the stop and the time set in [Pr.49] OPR dwell time elapses, the machine OPR is completed when the deviation counter clear
output is completed.
Stopper method 2 The point where a stopper is placed is set as an OP.
After the deceleration starts on the rising edge of the near-point dog, the machine presses the workpiece against the stopper at the
speed set in [Pr.47] Creep speed and stops.
After the stop and Zero signal
Stopper method 3 The point where a stopper is placed is set as an OP.
The machine starts at the speed set in [Pr.47] Creep speed from the beginning, presses the workpiece against the stopper and stops.
After the stop and Zero signal
Count method 1 After moving the distance set in [Pr.50] Setting for the movement amount after near-point dog ON from the point where the near-point
dog turns on, the machine stops at the first input of zero signals
The deceleration starts on the rising edge of the near-point dog and the machine moves at the speed set in [Pr.47] Creep speed.
After moving the distance set in [Pr.50] Setting for the movement amount after near-point dog ON from the point where the near-point
dog turns on, the machine stops at the first input of zero signals
OPR is completed.
Count method 2 After moving the distance set in [Pr.50] Setting for the movement amount after near-point dog ON from the point where the near-point
dog turns on, the machine stops. The position where the machine stops is set as an OP.
The deceleration starts on the rising edge of the near-point dog and the machine moves at the speed set in [Pr.47] Creep speed.
After moving the distance set in [Pr.50] Setting for the movement amount after near-point dog ON from the point where the near-point
dog turns on, the machine stops and the machine OPR is completed.
Data setting method The point where the machine OPR starts is set as an OP. After the deviation counter clear output is completed, the current feed value
and machine feed value are overwritten with the OP address, and the machine OPR is completed.
*1 The following shows the signals input as the zero signals of the RD75 in each OPR method.
Near-point dog method, Signal that is output as a single pulse at every motor revolution
count method 1: (including Z-phase signal output from the drive unit)
Stopper method 2 and 3: Signal that is output at the detection of the contact with the stopper. (This signal is input externally.)
The following table shows the external I/O signals used for the machine OPR.
: Required : Use as required : Not required
[Pr.43] OPR method Signal required for control
Near-point dog
Near-point dog method 

Stopper method 1

Stopper method 2
Stopper method 3 

Count method 1
Count method 2 

Data setting method
Creep speed
A creep speed is very slow. The stopping accuracy is low when the machine suddenly stops from a fast
speed. To improve the stopping accuracy of the machine, change the speed to a slow speed. Set this speed in
[Pr.47] Creep speed.
*1
is detected, the machine OPR is completed when the deviation counter clear output is completed.
*1
is detected, the machine OPR is completed when the deviation counter clear output is completed.
Zero signal Upper/lower limit switches
 
 
 
 
 
 
 
*1
. The machine OPR is completed when the
*1
. The position where the machine stops is set as an OP.
*1
. When the deviation counter clear output is completed, the machine
Deviation counter clear
output







2
Torque limit







2 OPR CONTROL
41
2.2 Machine OPR