Mitsubishi Electric Melservo-J4 Instruction Manual page 127

Description
The display shows "Ab".
*1
The display shows "b##".
The display shows "dEF".
The display shows "off".
Cause
Connection to MR-J4W3-_B with
software version A2 or earlier was
attempted in 0.222 ms
communication cycle.
MR-J4W3-_B was attempted to
use in fully closed loop system.
A SSCNET  cable was
disconnected.
The control circuit power supply of
the previous axis servo amplifier
is off.
The amplifier-less operation
function of servo system controller
is enabled.
The servo amplifier is
malfunctioning.
An Ethernet cable was
disconnected.
The servo amplifier power was
switched on when the master
station was off.
Communication cycle does not
match.
MR-J3-T10 is malfunctioning.
The servo amplifier is
malfunctioning.
The master station is
malfunctioning.
Test operation mode has been
enabled.
The system has been in the
ready-off state.
Initializing point table/program is
in progress.
Operation mode for manufacturer
setting is enabled.
Checkpoint
Check if the communication cycle
on servo system controller side is
0.222 ms.
Check if it was attempted to use in
fully closed loop system.
Check if "Ab" is displayed in the
corresponding axis and following
axes.
Check if the connectors (CNIA,
CNIB) are unplugged.
Check if "Ab" is displayed in the
corresponding axis and following
axes.
Check if the amplifier-less
operation function of servo
system controller is enabled.
Check if "Ab" is displayed in the
corresponding axis and following
axes.
Check if "Ab" is displayed in the
corresponding axis and following
axes.
Check the power of the master
station.
Check the communication cycle
on the master station side.
When using 8 axes or less: 0.888
ms
When using 16 axes or less:
1.777 ms
Check the communication cycle
by referring to the controller
instruction manual.
Replace the MR-J3-T10, and then
check the repeatability.
Replace the servo amplifier, and
then check the repeatability.
Replace the master station, and
then check the repeatability.
Test operation setting switch is
turned on.
Check if the servo ready state is
off with the servo system
controller.
Initializing of point table/ program
was set in the parameter ([Pr.
PT34] = 5001) and the power was
cycled.
Check if all of the control axis
setting switches (SW2) are on.
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.6 Trouble which does not trigger alarm/warning
Action
Use them with 0.444 ms or more
communication cycle.
MR-J4W3-_B does not support
the fully closed loop control
system. Use MR-J4-_B_ or MR-
J4W2-_B.
Replace the SSCNET  cable of
the corresponding axis.
Connect it correctly.
Check the power of the servo
amplifier.
Disable the amplifier-less
operation function.
Replace the servo amplifier of the
corresponding axis.
Replace the Ethernet cable of the
corresponding axis.
Turn on the power of the master
station.
Set it correctly.
Refer to the controller instruction
manual.
Replace the MR-J3-T10.
Replace the servo amplifier.
Replace the master station.
Turn off the test operation setting
switch.
Turn on the servo-on signals for
all axes.
It takes about 20 s for startup the
servo amplifier at initializing.
Please wait until the display
changes.
Set the control axis setting
switches (SW2) correctly.
Target
[WB]
1
[B]
[WB]
[RJ010]
[GF]
[RJ010]
[GF]
[RJ010]
[RJ010]
[GF]
[B]
[WB]
[RJ010]
[GF]
[A]
[B]
[WB]
[RJ010]
[GF]
125