Mitsubishi QD75M1 User Manual page 848

APPENDICES
Trouble type
How can the deceleration stop
time during stopping be shortened
using the hardware stroke limit?
The motor does not operate at
"60000ms" although the
acceleration/deceleration time is
set to "60000ms".
Acceleration/decelerat
ion time
Can each acceleration/
deceleration time be individually
set to trapezoidal or S-pattern
acceleration/deceleration?
The machine starts and stops
suddenly when carrying out JOG
operations and positioning
operations.
(Using an MR-J2S servo
amplifier.)
Are simplified absolute values
Simplified absolute
possible in the QD75P and QD75D
value
Positional deviation models?
The physical position deviates
from the commanded position,
Positional deviation although the positioning is
complete (and the monitored
current position is correct).
A setting of "1 µ m
required in the following system.
Electronic gear
Questions/Trouble
1PLS" is
•
Ball screw pitch 10mm
•
No. of feedback pulses
8192PLS
Set "1: Sudden stop" in the "
stop selection", and reduce the setting value of "
Sudden stop deceleration time".
The value set for the acceleration/deceleration time is the
time required for the machine to accelerate from speed
"0" to the value set in "
of that, the acceleration/deceleration time will also be
shorter than "60000ms" if the command speed value is
Pr.8
smaller than the "
Pr.9
explanation for "
The trapezoidal and S-pattern acceleration/deceleration
processing is a common setting for all
acceleration/deceleration times, so individual setting is not
possible.
(Refer to the section "12.7.7 Acceleration/deceleration
process function".)
Review the parameter settings for acceleration/
deceleration time, speed limit value, JOG speed limit
value, JOG acceleration/deceleration time, etc.
They are possible if the models are used in combination
with a Mitsubishi "AC Servo".
(Refer to "AC servo User's Manual" for details.)
If the deviation counter value is not "0", the servo side is
still moving.
Increase the torque.
In this case, the following values will result.
•
No. of pulses per rotation 8192
•
Movement amount per rotation 10000
•
Unit
magnification 10
Therefore, the "Movement amount per pulse" will become
"1.2207 µ m".
This value is fixed by the machine system, so it cannot be
changed.
Thus, the setting "1 µ m 1PLS" cannot be achieved.
Appendix - 95
MELSEC-Q
Remedy
Pr.37
Stop group 1 sudden
Pr.8
Speed limit value". Because
Speed limit value". (Refer to the
Pr.10
" and " " for details.)
No.
11
Pr.36
12
13
14
15
16
17