Machine Opr Method - Mitsubishi Electric QD77MS User Manual

8.2.2 Machine OPR method

[Pr.43] OPR method
Near-point dog method
Count method 1)
Count method 2)
Data set method
Scale origin signal
detection method
Driver OPR method
[Pr.43] OPR method
Near-point dog method
Count method 1)
Count method 2)
Data set method
Scale origin signal detection method
Driver OPR method
1: Confirm to the OPR specification of the servo amplifier for the signals required for control.
The method by which the machine OP is established (method for judging the OP and
machine OPR completion) is designated in the machine OPR according to the
configuration and application of the positioning method.
The following table shows the methods that can be used for this OPR method.
(The OPR method is one of the items set in the OPR parameters. It is set in "[Pr.43]
OPR method" of the basic parameters for OPR.)
Deceleration starts by the OFF
Creep speed".)
The operation stops once after the near-point dog turns ON and then OFF. Later the
operation restarts and then stops at the first zero signal to complete the OPR.
The deceleration starts by the OFF
at the "[Pr.47] Creep speed".
The machine stops once after moving the distance set in the "[Pr.50] Setting for the
movement amount after near-point dog ON" from the OFF
operation restarts and then stops at the first zero point to complete the machine OPR.
The deceleration starts by the OFF
at the "[Pr.47] Creep speed.
The machine moves the distance set in the "[Pr.50] Setting for the movement amount after
near-point dog ON" from the near-point dog OFF
position. The machine OPR is then regarded as completed.
The position where the machine OPR has been performed becomes an OP.
The current feed value and feed machine value are overwritten to the OP address.
The machine moves in the opposite direction against of "[Pr.44] OPR direction" at the
"[Pr.46] OPR speed" by the OFF
carried out once at the first zero signal. Later the operation moves in direction of "[Pr.44]
OPR direction" at the "[Pr.47] Creep speed", and then stops at the detected nearest zero
point to complete the machine OPR.
Refer to Appendix 6.3 "AlphaStep/5-phase stepping motor driver manufactured by
ORIENTAL MOTOR Co., Ltd." or Appendix 6.4 "IAI electric actuator controller
manufactured by IAI Corporation" for details on the driver OPR method.
REMARK
Creep speed
The stopping accuracy is poor when the machine suddenly stops from fast speeds.
To improve the machine's stopping accuracy, it is required to slow down the
speed before it stops. This speed is set in the "[Pr.47] Creep speed".
The following shows the signals as required for machine OPR.
Operation details
ON of the near-point dog. (Speed is reduced to "[Pr.47]
ON of the near-point dog, and the machine moves
ON of the near-point dog, and the machine moves
ON of the near-point dog, and a deceleration stop is
Signals required for control
Near-point dog
*1
: Necessary,
8 - 7
Chapter 8 OPR Control
ON position. Later the
ON position, and stops at that
Zero signal Upper/lower limit
*1
: Necessary as required,
*1
: Unnecessary