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Introduction
3. Troubleshooting at startup
CAUTION
Never adjust or change the parameter values extremely as it will make operation
unstable.
POINT
You can refer to reasons for servo motor rotation failure, etc. using MR
Configurator.
The following faults may occur at startup. If any of such faults occurs, take the corresponding action.
(1) Troubleshooting
No. Step of occurrence Fault Investigation Possible cause Reference
1 Power on
The 3-digit, 7-segment
LED is not lit.
The 3-digit, 7-segment
LED blinks.
Not improved even if CN1, CN2
and CN3 connectors are
disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when CN1 connector is
disconnected.
Power supply of CN1 cabling is
shorted.
Improved when CN2 connector is
disconnected.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
Improved when CN3 connector is
disconnected.
Power supply of CN3 cabling is
shorted.
Alarm occurs. Remove cause. Section
8.2
Digital output ALM
occurs. The 3-digit,
7-segment LED does not
display the alarm.
Check the ON/OFF status of the
output signal on the external I/O
signal display (refer to section
5.8).
Wiring mistake.
The polarity of the digital output
circuit diode is not correct.
Section
3.8.2
2 Switch on servo-on
(SON).
Alarm occurs. Remove cause. Section
8.2
Servo motor shaft is
free.
Check the followings.
1. Check the display to see if the
servo amplifier is ready to
operate.
2. Check the external I/O signal
display (refer to section 5.8) to
see if the servo-on (SON) is ON.
1. Servo-on (SON) is not input.
(Wiring mistake)
2. The interface power supply
(24VDC) is not supplied.
Section
5.8
3 Input command
pulse.
(Test operation)
(In the position
control mode)
Servo motor does not
rotate.
Check the cumulative command
pulses on the status display or on
MR Configurator.
1. Wiring mistake.
(a) For open collector pulse train
input, 24VDC power is not
supplied to OPC.
(b) LSP and LSN are not on.
(c) Wiring mistake.
The polarity of the digital output
circuit diode is not correct.
2. No pulses are input.
3. Electromagnetic brake operates.
Section
3.8.2
Section
3.11
Section
4.1.11
Section
5.3
Check if the ready (RD) is ON.
Check the set value of parameter
No.PA13 (command input pulse
form).
Check if the electromagnetic
brake interlock (MBR) is ON.
Check the ON/OFF status of the
output signal on the external I/O
signal display (refer to section
5.8).
Wiring mistake.
The polarity of the digital output
circuit diode is not correct.
Section
3.8.2
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