Mitsubishi Electronics QD75D Signal should be turned on at 4ms or more, Selected? Setting value

APPENDICES

MELSEC-Q

Trouble type

Questions/Trouble

Remedy

No.

The positioning start signal [Y10] is

After the BUSY signal turns ON, there is no problem with

kept ON until the BUSY signal is

turning [Y10] OFF before the BUSY signal turns OFF.

OFF, but is there any problem with

25

(The QD75 detects the rising edge (OFF

ON) of the

Start

turning it OFF before the BUSY

positioning start signal [Y10].)

signal turns OFF?

Check the "

axis operation status" and

The operation will not start even

Md.26

26

when the start signal is turned ON.

"

axis error No".

Md.23

How many milliseconds should the

The signal should be turned ON at 4ms or more.

axis stop signal [Y4] be turned ON

(If possible, set the signal so it does not turn ON only

27

momentarily, but instead stays ON until the BUSY signal

for?

turns OFF. This will keep the stop signal from skipping.)

to

How can a sudden stop be

Set "1: Sudden stop" in the parameter from

Pr.37

28

Pr.39

corresponding to the stop group, and reduce the

selected?

setting value of "

Sudden stop deceleration time".

Pr.36

Stop

"Normal deceleration stop" was

selected in "

Pr.39

Stop group 3

The operation will not change.

sudden stop", and Y stop was

Even if the same stop factor is input again during the

turned ON. If the

Pr.39

setting is

deceleration stop, it will be ignored. The same

29

changed to "sudden stop" during a

deceleration stop process used when the stop signal was

first input will be continued.

deceleration stop, and the Y stop

signal turns from OFF to ON, will

(This also applies for

Pr.37

and

Pr.38

.)

the operation change to a sudden

stop from that point?

ABS system circular interpolation

The address designation may be incorrect. When carrying

Circular interpolation

operates normally, but a vertically

out INC system circular interpolation, designate the

30

oblong circle results when INC

relative addresses from the starting point of both the

system circular interpolation is

center point and end point.

carried out.

Can the speed be changed during

Speed-position

speed control and position control

No. The speed for the speed control and position control

31

switching control

by speed-position switching

cannot be set differently.

control?

Either of the following is possible.

1) The sequence program may be incorrect. Check by

creating a test program in which the JOG start signal

is turned ON only.

Even if the JOG start signal is

2) If the machine is hitting something when the torque

turned ON, the response until it

32

setting is low, it may be trying to move by JOG

turns ON is sometimes slow.

operation in the opposite direction. In this case, the

machine will start moving only after the internal droop

pulses have been reached 0 in the counter, even if the

JOG operation

JOG start signal has been turned ON. This makes it

seem that the response is slow.

Either of the following is possible.

1) The JOG start signal may be chattering. Monitor the

The operation is not carried out at

JOG start signal to confirm whether it is chattering.

(When using the "BUSY signal" in the JOG operation

the set JOG speed, although the

start circuit, check the position of the BUSY signal.)

33

speed limit value has not been

reached.

2) The "

Pr.31

JOG speed limit value" may not be

appropriate. Review the setting value and carry out

the JOG operation again.

Appendix - 95