Mitsubishi Electric QD75MH1 User Manual page 804

APPENDICES
Trouble type
When a JOG operation is
attempted, an error results and the
machine does not move.
JOG operation
Why does the positioning complete
signal turns ON during the JOG
operation?
Is it possible to count the pulses
when the B phase is set to "1", and
only A phase pulses are input?
Can a manual pulse generator
Manual pulse
other than the Mitsubishi MR-
generator operation
HDP01 be used?
Can one manual pulse generator
be operated connected to several
QD75MH modules?
The BUSY signal is not canceled
Current value
by the current value changing.
changing
How can it be canceled?
The QD75MH READY signal does
QD75 READY signal not turn ON even when the PLC
READY signal [Y0] is turned ON.
Is there any problem with setting
an M code ON signal OFF request
M code ON signal
in the next scan after the M code
ON signal ON?
Error 537 (PLC READY signal
OFF at positioning start) occurs
Module
after the QD75MH is replaced.
(The PLC program is the same.)
The motor only rotates in one
direction.
Motor
Can the current motor speed be
monitored?
Questions/Trouble
Appendix - 55
Pr.31
The " JOG speed limit value" may be larger than
Pr.8
the " Speed limit value".
Review the parameters and carry out the JOG operation
again.
If a value other than "0" is set for "
movement amount", the inching operation is carried out
and the positioning complete signal turns ON.
Cd.16
Confirm that the "
set to "0".
Possible.
Set the " Pr.24 Manual pulse generator input selection"
to "3: PLS/ SIGN mode". It is possible to count the pulses
when only A phase pulses are input.
Other manual pulse generators can be used if they
conform to Section 3.4 "Specifications for input/output
interfaces with external devices."
The product warranty by the combination of QD75MH and
manual pulse generator other than the MR-HDP01 is not
possible.
This is possible if the system conforms to the electrical
specifications.
The product warranty by the combination of several
QD75MH and one manual pulse generator is not possible.
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.
"A parameter error" has occurred.
Confirm the error No. in the error history, and correct the
parameter.
The QD75MH checks the M code ON signal OFF request
every "1.7ms", so there is a possibility that the M code ON
signal OFF may be delayed by a maximum of "1.7ms"
after the M code ON signal ON, even if an M code ON
signal OFF request is set.
The internal parameters of the QD75MH 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 QD75MH
READY signal is OFF, the parameter error has occurred.
Check the error code and modify the parameter with the
error.
The parameter settings on the QD75MH side may not
match those on the servo side.
Check the parameter settings.
The speed shown on the QD75MH 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.)
MELSEC-Q
Remedy
Cd.16
Inching
Inching movement amount" is
No.
34
35
36
37
38
39
40
41
42
43
44