Mitsubishi Electronics QD75D Trouble type Questions/Trouble Remedy, How can the deceleration stop

APPENDICES

MELSEC-Q

Trouble type

Questions/Trouble

Remedy

No.

Set "1: Sudden stop" in the "

How can the deceleration stop

Pr.37

Stop group 1

time during stopping be shortened

sudden stop selection", and reduce the setting value of

11

using the hardware stroke limit?

"

Pr.36

Sudden stop deceleration time".

The value set for the acceleration/deceleration time is the

time required for the machine to accelerate from speed

Speed limit value". Because

The motor does not operate at

"0" to the value set in "

Pr.8

"60000ms" although the

of that, the acceleration/deceleration time will also be

12

acceleration/deceleration time is

shorter than "60000ms" if the command speed value is

set to "60000ms".

smaller than the "

Pr.8

Speed limit value". (Refer to the

Acceleration/decelerat

explanation for

and

for details.)

Pr.9

Pr.10

ion time

The trapezoidal and S-pattern acceleration/deceleration

Can each acceleration/

processing is a common setting for all

deceleration time be individually

acceleration/deceleration times, so individual setting is not

13

set to trapezoidal or S-pattern

possible.

acceleration/deceleration?

(Refer to Section 12.7.7 "Acceleration/deceleration

process function".)

The machine starts and stops

suddenly when carrying out JOG

Review the parameter settings for acceleration/

operations and positioning

deceleration time, speed limit value, JOG speed limit

14

operations.

value, JOG acceleration/deceleration time, etc.

(Using an MR-J2S servo

amplifier.)

Simplified absolute

Are simplified absolute position

They are possible if the models are used in combination

detection system possible in the

position detection

with a Mitsubishi "AC Servo".

15

QD75P and QD75D Positional

system

(Refer to "AC servo User's Manual" for details.)

deviation models?

The physical position position

detection system from the

If the deviation counter value is not "0", the servo side is

commanded position, although the

Positional deviation

still moving.

16

positioning is complete (and the

Increase the torque.

monitored current position is

correct).

In this case, the following values will result.

∝

•

No. of pulses per rotation

8192

A setting of "1 m

1pulse" is

•

Movement amount per rotation

10000

required in the following system.

•

Unit magnification

10

Electronic gear

•

Ball screw pitch

10mm

Therefore, the "Movement amount per pulse" will become

17

•

No. of feedback pulses

∝

"1.2207 m".

8192pulse

This value is fixed by the machine system, so it cannot be

changed.

∝

1pulse" cannot be achieved.

Thus, the setting "1 m

Appendix - 93