Mitsubishi Electric MELSEC-Q QD75M User Manual page 830

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?
Manual pulse
Can a manual pulse generator
generator operation
other than the Mitsubishi MR-
HDP01 be used?
Can one manual pulse generator
be operated connected to several
QD75 modules?
The BUSY signal is not canceled
Current value
by the current value changing.
changing
How can it be canceled?
The QD75 READY signal does not
QD75 READY signal 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?
The servo amplifier LED remains
Servo ON "Ab" even if all axis servo Y1 is
turned ON.
Error 537 (PLC READY signal
OFF at positioning start) occurs
Module
after the QD75 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 - 61
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 interfaces with
external devices."
This is possible if the system conforms to the electrical
specifications.
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 QD75 checks the M code ON signal OFF request
every "3.5ms", so there is a possibility that the M code ON
signal OFF may be delayed by a maximum of "3.5ms"
after the M code ON signal ON, even if an M code ON
signal OFF request is set.
Set the motor capacity for servo parameter (30104,
30204, 30304, 30404).
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.
The parameter settings on the QD75 side may not match
those on the servo side.
Check the parameter settings.
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.)
MELSEC-Q
Remedy
Cd.16
Inching
Inching movement amount" is
No.
34
35
36
37
38
39
40
41
42
43
44
45