Mitsubishi Electric MELSERVO-J4 Instruction Manual page 132

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Description
The position deviates during
operation after home position
return.
Possible cause
Frequency of the pulse train
command is too high.
A cable for command is too
long.
SON (Servo-on) turned off
during operation.
CR (Clear) or RES (Reset)
turned on during operation.
The setting of point tables
and start timing is incorrect.
An input signal to the MR-
D01 extension IO unit is
incorrect.
The program, start timing, etc.
are incorrect.
The setting of MR-DS60
digital switch is incorrect.
The wiring between MR-DS60
digital switch and MR-D01
extension IO unit is incorrect.
Wiring of the MR-HDP01
manual pulse generator or
setting of "manual pulse
generator multiplication" ([Pr.
PT03], TP0 (manual pulse
generator multiplication 1),
TP1 (manual pulse generator
multiplication 2)) is incorrect.
A mechanical slip occurred.
Or the backlash of the
machine part is large.
Check result
Check the pulse train
command frequency is within
the range of specifications.
It is 500 kpulses/s or less for
the open-collector type. It is
4 Mpulses/s or less for the
differential line driver type.
Check the ripple of the
command frequency with
oscilloscope.
Check if SON (Servo-on) is
off during operation using
status display or MR
Configurator2.
Check if CR (Clear) or RES
(Reset) is on during operation
using status display or MR
Configurator2.
Check if a time period from
after switching timings of
point table setting value and
point table No. until a start
timing is 3 ms or more.
Check the selection of the
point table No. selection 1 to
point table No. selection 8
and check the wiring.
Check if a time period from
after switching timings of
BCD input program and point
table No. until a start timing
is 3 ms or more, etc.
Check the [Pr. Po10] setting.
Check the wiring between
MR-DS60 digital switch and
MR-D01 extension IO unit.
The input value from the MR-
HDP01 manual pulse
generator and the command
position do not match.
Check if there is a slip or
backlash on the machine part.
1 - 125
Action
Review the pulse train
command frequency. Select
a filter according to the pulse
train command frequency
from "Command input pulse
train filter selection" in [Pr.
PA13].
Shorten the wiring length.
Cable length must be 10 m
or shorter for differential line
driver output and 2 m or
shorter for open-collector
output.
Review the wiring and
sequence not to turn off SON
(Servo-on) during operation.
Review the wiring and
sequence not to turn on CR
(Clear) or RES (Reset)
during operation.
Review the point table
setting.
Review the start timing.
Check the input signal switch
to the MR-D01 extension IO
unit and check the wiring.
Review the controller
programs.
Review the [Pr. Po10]
setting.
Review the wiring between
MR-DS60 digital switch and
MR-D01 extension IO unit.
Review the wiring.
Set the multiplication setting
correctly.
Adjust the machine part.
Target
[A]
[A]
[B]
[WB]
[RJ010]
[GF]