Setting The Dwell Time During An Opr Retry - Mitsubishi Electric QD77MS User Manual

(3) Setting the dwell time during an OPR retry

The OPR retry function can perform such function as the dwell time using
"[Pr.57] Dwell time during OPR retry" when the reverse run operation is
carried out due to detection by the limit signal for upper and lower limits and
when the machine OPR is executed after the near point dog is turned OFF
to stop the operation.
"[Pr.57] Dwell time during OPR retry" is validated when the operation stops
at the "A" and "B" positions in the following drawing. (The dwell time is the
same value at both positions "A" and "B".)
Machine OPR
executed again
B
Stop by near-point
dog OFF
Near-point dog
Zero signal
Fig. 13.3 Setting the dwell time during an OPR retry
[2] Precaution during control
(1) The following table shows whether the OPR retry function may be executed
by the "[Pr.43] 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
(2) Always establish upper/lower limit switches at the upper/lower limit positions
of the machine. If the OPR retry function is used without hardware stroke
limit switches, the motor will continue rotation until a hardware stroke limit
signal is detected.
(3) Do not configure a system so that the servo amplifier power turns OFF by
the upper/lower limit switches. If the servo amplifier power is turned OFF,
the OPR retry cannot be carried out.
(4) The operation decelerates upon detection of the hardware limit signal, and
the movement starts in the opposite direction. In this case, however, the
error "Hardware stroke limit (+)" (error code: 104) or "Hardware stroke limit
(–)" (error code: 105) does not occur.
Pr. 44
OPR direction
OP
Machine OPR start
Reverse run operation
after limit signal detection
Limit signal OFF
Execution status of OPR retry function
13 - 6
Chapter 13 Control Sub Functions
Stop by limit
signal detection
A
Hardware limit switch
: Execution possible
: Execution possible
: Execution possible
: Execution not possible