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Appendix - 96
MELSEC-Q
APPENDICES
Trouble type Questions/Trouble Remedy No.
When a JOG operation is
attempted, an error results and the
machine does not move.
The "
Pr.31
JOG speed limit value" may be larger than
the "
Pr.8
Speed limit value".
Review the parameters and carry out the JOG operation
again.
34
JOG operation
Why does the positioning complete
signal turns ON during the JOG
operation?
If a value other than "0" is set for "
Cd.16
Inching
movement amount", the inching operation is carried out
and the positioning complete signal turns ON.
Confirm that the "
Cd.16
Inching movement amount" is
set to "0".
35
Is it possible to count the pulses
when the B phase is set to "1", and
only A phase pulses are input?
Not possible.
(The QD75 counts 1, 0, 1, 0.)
36
Can a manual pulse generator
other than the Mitsubishi MR-
HDP01 be used?
Other manual pulse generators can be used if they
conform to Section 3.4 "Specifications for input/output
interfaces with external devices."
37
Manual pulse
generator operation
Can one manual pulse generator
be operated connected to several
QD75 modules?
This is possible if the system conforms to the electrical
specifications.
38
Current value
changing
The BUSY signal is not canceled
by the current value changing.
How can it be canceled?
The BUSY signal may remain if the scan time is long.
Use a complete signal to check whether the current value
changing has been executed.
39
QD75 READY signal
The QD75 READY signal does not
turn ON even when the PLC
READY signal [Y0] is turned ON.
"A parameter error" has occurred.
Confirm the error No. in the error history, and correct the
parameter.
40
M code ON signal
Is there any problem with setting
an M code ON signal OFF request
in the next scan after the M code
ON signal ON?
The QD75 checks the M code ON signal OFF request
every "1.8ms", so there is a possibility that the M code ON
signal OFF may be delayed by a maximum of "1.8ms"
after the M code ON signal ON, even if an M code ON
signal OFF request is set.
41
How long is the output time for the
deviation counter clear signal?
The time set in "
Pr.55
Deviation counter signal output
time". (Initial value: 11 ms)
42
Is a deviation counter clear signal
output when the positioning is
complete?
A signal is not output.
The only time the QD75 outputs a deviation counter clear
signal is for a machine OPR.
43
Deviation counter
clear
How can a deviation counter clear
signal be output?
The QD75 does not output a deviation counter clear
signal except for machine OPR.
44
Module
Error 537 (PLC READY OFF start)
occurs after the QD75 is replaced.
(The sequence program is the
same.)
The internal parameters of the QD75 may be different.
Check if the QD75 READY signal [X0] turns ON when the
PLC READY signal [Y0] turns ON.
When the PLC READY signal is ON but the QD75
READY signal is OFF, the parameter error has occurred.
Check the error code and modify the parameter with the
error.
45
The motor only rotates in one
direction.
The parameter settings on the QD75 side may not match
those on the servo side.
Check the parameter settings.
46
Motor
Can the current motor speed be
monitored?
The speed shown on the QD75 monitor is calculated from
the number of pulses output from the module. Thus, the
actual motor speed cannot be monitored.
("
Md.22
Feedrate" monitors the commanded speed. It
does not show the actual motor speed.)
47