Mitsubishi Electronics QD75P, QD75D When a JOG operation is, PLC Ready signal Y0 turns on Module

APPENDICES

MELSEC-Q

Trouble type

Questions/Trouble

Remedy

No.

The "

JOG speed limit value" may be larger than

Pr.31

When a JOG operation is

the "

Pr.8

Speed limit value".

attempted, an error results and the

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machine does not move.

Review the parameters and carry out the JOG operation

JOG operation

again.

If a value other than "0" is set for "

Cd.16

Inching

Why does the positioning complete

movement amount", the inching operation is carried out

signal turns ON during the JOG

and the positioning complete signal turns ON.

35

operation?

Confirm that the "

Inching movement amount" is

Cd.16

set to "0".

Is it possible to count the pulses

Not possible.

when the B phase is set to "1", and

36

only A phase pulses are input?

(The QD75 counts 1, 0, 1, 0.)

Manual pulse

Can a manual pulse generator

Other manual pulse generators can be used if they

other than the Mitsubishi MR-

conform to Section 3.4 "Specifications for input/output

37

generator operation

HDP01 be used?

interfaces with external devices."

Can one manual pulse generator

This is possible if the system conforms to the electrical

be operated connected to several

38

QD75 modules?

specifications.

Current value

The BUSY signal is not canceled

The BUSY signal may remain if the scan time is long.

by the current value changing.

Use a complete signal to check whether the current value

39

changing

How can it be canceled?

changing has been executed.

The QD75 READY signal does not

"A parameter error" has occurred.

QD75 READY signal

turn ON even when the PLC

Confirm the error No. in the error history, and correct the

40

READY signal [Y0] is turned ON.

parameter.

Is there any problem with setting

The QD75 checks the M code ON signal OFF request

every "1.8ms", so there is a possibility that the M code ON

an M code ON signal OFF request

M code ON signal

signal OFF may be delayed by a maximum of "1.8ms"

41

in the next scan after the M code

after the M code ON signal ON, even if an M code ON

ON signal ON?

signal OFF request is set.

The time set in "

Deviation counter signal output

How long is the output time for the

Pr.55

42

deviation counter clear signal?

time". (Initial value: 11 ms)

Deviation counter

Is a deviation counter clear signal

A signal is not output.

clear

output when the positioning is

The only time the QD75 outputs a deviation counter clear

43

complete?

signal is for a machine OPR.

How can a deviation counter clear

The QD75 does not output a deviation counter clear

44

signal be output?

signal except for machine OPR.

The internal parameters of the QD75 may be different.

Error 537 (PLC READY OFF start)

Check if the QD75 READY signal [X0] turns ON when the

PLC READY signal [Y0] turns ON.

Module

occurs after the QD75 is replaced.

When the PLC READY signal is ON but the QD75

45

(The sequence program is the

READY signal is OFF, the parameter error has occurred.

same.)

Check the error code and modify the parameter with the

error.

The motor only rotates in one

The parameter settings on the QD75 side may not match

those on the servo side.

46

direction.

Check the parameter settings.

Motor

The speed shown on the QD75 monitor is calculated from

the number of pulses output from the module. Thus, the

Can the current motor speed be

actual motor speed cannot be monitored.

47

monitored?

("

Md.22

Feedrate" monitors the commanded speed. It

does not show the actual motor speed.)

Appendix - 96