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9. TROUBLESHOOTING
9.4 Troubles without an alarm/warning
POINT
Even if a servo amplifier, a servo motor, or an encoder malfunctions, the following
phenomena may occur.
The following shows the examples of the estimated causes of the troubles without alarms/warnings. Refer to
this chapter and remove their causes.
Phenomena Checkpoint Estimated cause Action
A LED indication
turns off.
When fixing by disconnecting all
the connectors other than the
power supply, check if the
disconnected cables are not
shorted.
An external I/O terminal is shorted. Check the wiring of the I/O signal.
Check that the control circuit
power is not turned off.
The control circuit power is not turned
on.
Turn the control circuit power on.
Check that the control circuit
power voltage is not low.
The control circuit power voltage
decreased.
Set the control circuit power voltage
within the rated range.
The servo motor
does not operate.
Check that a warning (AL.99) does
not occur.
The forward rotation stroke end (LSP)
or the reverse rotation stroke end
(LSN) is not turned on.
Turn on both the forward rotation
stroke end (LSP) and the reverse
rotation stroke end (LSN).
Check the connection with the
servo motor.
The U, V, W output terminals of the
servo amplifier is not connected with
each U, V, W input terminals of the
servo motor.
Connect each U, V, W phase
properly.
Check that a warning (AL.E9)
does not occur.
The servo-on (SON) is turned on
while the main circuit power of the
servo amplifier is off.
Turn the main circuit power on.
Check that the servo alarm/
warning is occurring.
A servo alarm is occurring. Check the details of the alarm and
remove its cause.
Check the external input signal is
on or off.
1. Check the external I/O signal
display in the diagnostic mode.
2. Check that the input signal is
ON or OFF on the "I/O interface
display" command of the
"Monitor" menu on MR
Configurator.
The servo-on (SON) is off. Turn on the servo-on (SON).
Reset (RES) is on. Turn reset (RES) off.
<Speed control mode>
1. Both the forward rotation start
(ST1) and the reverse rotation start
(ST2) are off.
2. Both the forward rotation start
(ST1) and the reverse rotation start
(ST2) are on.
Input the forward rotation start (ST1)
and the reverse rotation start (ST2)
properly.
<Torque control mode>
1. Both the forward rotation selection
(RS1) and the reverse rotation
selection (RS2) are off.
2. Both the forward rotation selection
(RS1) and the reverse rotation
selection (RS2) are on.
Input the forward rotation selection
(RS1) and the reverse rotation
selection (RS2) properly.
<Speed control mode/torque control
mode>
The setting of the speed selection 1
(SP1), the speed selection 2 (SP2) or
the speed selection 3 (SP3) is
incorrect.
1. Review the wiring.
2. Check the setting of the speed
selection 1 (SP1), the speed
selection 2 (SP2) and the speed
selection 3 (SPV).