Mitsubishi Electric MELSERVO-J4 Instruction Manual page 126

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Description
The servo motor does not
operate.
Possible cause
The setting of the torque limit
is incorrect.
Machine is interfering with
the motor.
For a servo motor with an
electromagnetic brake, the
brake has not released.
LSP (Forward rotation stroke
end) and LSN (Reverse
rotation stroke end) are not
on.
SON (Servo-on) is not on.
RES (Reset) is on.
The setting of the control
mode is incorrect.
The command pulse is not
inputted in the position
control mode.
The wiring of the command
pulse train signal is incorrect
in the position control mode.
The setting of the command
pulse input form is incorrect in
the position control mode.
Both of ST1 (Forward
rotation start) and ST2
(Reverse rotation start) are
on or off in the speed control
mode or the positioning
mode.
Both of RS1 (Forward
rotation selection) and RS2
(Reverse rotation selection)
are on or off in the torque
control mode.
The value selected in the
speed control mode or the
torque control mode is low.
The value selected in the
positioning mode (point table
method) with BCD input is
low.
An analog signal is not
inputted correctly.
Check result
Check if the torque limit is
"0".
[A]: [Pr. PA11] and [Pr.
PA12], or analog input
[B] [WB] [RJ010]: Setting on
controller side
[GF]: [Pr. PA11], [Pr. PA12],
or setting on controller side
Check if machine is
interfering.
Check the power supply of
the electromagnetic brake.
Check if [AL. 99] is occurring. Turn on LSP and LSN.
Check the SON (Servo-on)
state.
Check the RES (Reset)
state.
Check the [Pr. PA01] setting. Set it correctly.
Check if the pulse train is
outputted on the controller
side.
Check the cumulative
command pulses using the
status display or MR
Configurator2. Input the
pulse train command and
check if the display changes.
Check that the pulse train
form outputted with the
controller and the setting of
[Pr. PA13] are matched.
Check the status of ST1
(Forward rotation start) and
ST2 (Reverse rotation start).
Check the status of RS1
(Forward rotation selection)
and RS2 (Reverse rotation
selection).
Check SP1 (Speed selection
1), SP2 (Speed selection 2),
and SP3 (Speed selection 3),
and then check if the
selected internal speed is
correct.
Check SPD1 (Speed
selection 1), SPD2 (Speed
selection 2), SPD3 (Speed
selection 3) and SPD4
(Speed selection 4), and
then check if the selected
internal speed is correct.
Check the values of analog
speed command and analog
torque command using
status display or MR
Configurator2.
1 - 119
Action
Set it correctly.
Remove the interference.
Turn on the electromagnetic
brake power.
Turn on SON (Servo-on).
Turn off RES (Reset).
Review the setting on the
controller side.
Review the wiring. When the
signal is used in open-
collector type, input 24 V DC
to OPC.
Review the [Pr. PA13]
setting.
Turn on ST1 (Forward
rotation start) or ST2
(Reverse rotation start).
Turn on RS1 (Forward
rotation selection) or RS2
(Reverse rotation selection).
Review the selections of SP1
(Speed selection 1), SP2
(Speed selection 2), SP3
(Speed selection 3), and
setting of internal speed.
Review the wiring. Review
the selections of SPD1
(Speed selection 1), SPD2
(Speed selection 2), SPD3
(Speed selection 3), SPD4
(Speed selection 4), and
setting of internal speed.
Input the analog signals
correctly.
Target
[A]
[B]
[WB]
[RJ010]
[GF]
[A]
[GF]
[A]