Mitsubishi Electric MELSERVO-JE Instruction Manual page 73

1. SERVO AMPLIFIER TROUBLESHOOTING
Description
The position deviates during
operation after the home
position return.
For the absolute position
detection system, a
restoration position deviates
at restoration of power.
Cause
The frequency of the pulse
train command is too high.
The cable for a 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.
The program, start timing, etc.
are 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.
The servo motor was rotated
at a speed exceeding the
maximum permissible speed
at a power failure (6000 r/min)
by an external force during
servo amplifier power-off.
(The acceleration time was
0.2 s or less.)
The servo amplifier power
was turned on while the servo
motor was rotated at a speed
exceeding 3000 r/min by an
external force.
Checkpoint
Check if 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 pulse with an
oscilloscope.
Check if SON (Servo-on)
turns off during operation
using the status display or
MR Configurator2.
Check if CR (Clear) or RES
(Reset) turns on during
operation using the 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 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.
The input value from the MR-
HDP01 manual pulse
generator and the command
position do not match.
Check the machine part if
slip or backlash occurs.
Check if the servo motor was
accelerated suddenly to
6000 r/min by an external
force.
Check if the servo amplifier
power was turned on while
the servo motor was rotated
at a speed exceeding 3000
r/min by an external force.
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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. It
must be 10 m or shorter for
the differential line driver
type and 2 m or shorter for
the open-collector type.
Review the wiring or
sequence so that SON
(Servo-on) does not turn off
during operation.
Review the wiring or
sequence so that CR (Clear)
or RES (Reset) does not turn
on during operation.
Review the point table setting.
Review the start timing.
Review the controller
programs.
Review the wiring.
Set the multiplication setting
correctly.
Adjust the machine part.
Extend the acceleration time. [B]
Review the power-on timing.
Target
[A]
[C]
[A]
[A]
[B]
[C]
[C]