Mitsubishi Electronics QD75D Unit magnification to 10-fold or Is set to, Is there any problem if

APPENDICES

MELSEC-Q

Trouble type	Questions/Trouble		Remedy
		0 ≤	Backlash compensation value	255
			Movement amount per pulse

No.

Error 920 (backlash compensation

Setting is not possible if the above equation is not

amount error) occurs even when

satisfied.

48

the backlash compensation value

Adjust by setting "

Pr.4

Unit magnification" to 10-fold (or

is set to "1".

100-fold, or 1000-fold), and setting "

Movement

Pr.2

amount per rotation" to 1/10 (or 1/100, or 1/1000).

When a JOG operation is

attempted, errors such as error

The hardware stroke limit wiring has probably not been

104 (hardware stroke limit+) or

carried out.

49

error 105 (hardware stroke limit

)

Refer to Section 12.4.4 "Hardware stroke limit function" for

occur and the machine does not

details, and wire accordingly.

move.

Error/warning

Error 997 (Speed selection at OP

A value besides "0" or "1" may be set in the " Pr.56

shift error) appears when the PLC

Speed designation during OP shift".

50

READY signal [Y0] turns from OFF

Review the set sequence program, and reset the correct

to ON.

parameters.

When the start signal was turned

The QD75 starts the deceleration stop process when the

stop signal ON is detected. Thus, the machine interprets

ON immediately after the stop

that "positioning is still being executed" immediately after

signal ON, warning 100 (start

51

the stop signal ON. Even if the start signal is turned ON at

during operation) was detected,

that time, the start request will be ignored and warning

and the start was ignored.

100 will occur.

Does warning 500 (deceleration

The warning occurs only at those times mentioned at the

and stop speed change) occur

left. Because this is a warning, there is no problem if the

only during "stop deceleration" and

"automatically deceleration"?

operation can be continued without resetting the error.

52

(When the speed is changed using the override, the new

Is there any problem if the

value will not be reflected on the data being executed, but

operation is continued in that state

without resetting the error?

will be reflected from the next start.)

Depending on the stop occurrence factor, positioning may

have not been completed normally.

Check the axis monitor "

Axis operation status"

Md.26

after the BUSY signal has turned OFF.

Stop

: The stop signal has turned ON

during positioning.

Check the condition under which the

53

Position control was executed but

stop signal (Y stop, external stop)

Positioning complete

turns ON.

the positioning complete signal

Error occurrence

: An error has occurred during

signal

does not turn ON.

positioning.

Check the error occurrence factor

from "

Axis error No.".

Md.23

The setting value of the detailed parameter 2 "Positioning

complete signal output time" is 0 or shorter than the scan

time.

54

Using the sequence program, set the time when the signal

can be detected securely.

Appendix - 97