Operations When Stroke Limit Error Occurs - Mitsubishi Electric QD77MS User Manual

Important
When the inching operation is carried out near the upper or lower limit, use the
hardware stroke limit function (Refer to Section 13.4.4).
If the hardware stroke limit function is not used, the workpiece may exceed the
movement range, and an accident may result.
Precautions during operation
The following details must be understood before inching operation is carried out.
(1) Acceleration/deceleration processing is not carried out during inching
operation.
(Commands corresponding to the designated inching movement amount are
output at operation cycle. When the movement direction of inching operation
is reversed and backlash compensation is carried out, the backlash
compensation amount and inching movement amount are output at the same
operation cycle.)
The "[Cd.17] JOG speed" is ignored even if it is set. The error "Inching
movement amount error" (error code: 301) will occur in the following case.
([Cd.16] Inching movement amount) x (A) > ([Pr.31] JOG speed limit value)
However, (A) is as follows.
When unit is set to PLS
When unit is set to degree and the "[Pr.83] Speed control 10 x
multiplier setting for degree axis" is valid
When unit setting is other than the above
(2) Set a value other than a "0" in "[Cd.16] Inching movement amount".
If a "0" is set, the operation will become JOG operation (Refer to Section 11.2
"JOG operation").

Operations when stroke limit error occurs

When the operation is stopped by hardware stroke limit error or software stroke
limit error, the inching operation can be performed in an opposite way (direction
within normal limits) after an error reset.
(An error will occur again if JOG start signal is turned ON in a direction to outside
the stroke limit.)
V
Inching operation possible
Upper/lower
limit signal
Inching operation
Inching operation not possible
ON
OFF
11 - 16
Chapter 11 Manual Control
Unit : [ms]
Operation cycle
0.88 1.77
1125 562.5
67.5 33.75
675 337.5