MITSUBISHI ELECTRIC MELSERVO MR-J2S- A - Manual (Page 194)

10 - 1
10. TROUBLESHOOTING
10. TROUBLESHOOTING
10.1 Trouble at start-up
CAUTION
Excessive adjustment or change of parameter setting must not be made as it will
make operation instable.
POINT
Using the MR Configurator (servo configuration software), you can refer to
unrotated servo motor reasons, etc.
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
10.1.1 Position control mode
(1) Troubleshooting
No. Start-up sequence Fault Investigation Possible cause Reference
Not improved if connectors
CN1A, CN1B, CN2 and CN3
are disconnected. 1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when connectors
CN1A and CN1B are
disconnected. Power supply of CNP1 cabling
is shorted.
Improved when connector
CN2 is disconnected. 1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
LED is not lit.
LED flickers.
Improved when connector
CN3 is disconnected. Power supply of CN3 cabling is
shorted.
1 Power on
Alarm occurs. Refer to Section 10.2 and remove cause. Section 10.2
Alarm occurs. Refer to Section 10.2 and remove cause. Section 10.2 2 Switch on servo-on
(SON).
Servo motor shaft is
not servo-locked
(is free). 1. Check the display to see if
the servo amplifier is
ready to operate.
2. Check the external I/O
signal indication to see if
the servo-on (SON) is ON.
1. Servo-on (SON) is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
Section 6.6
Servo motor does
not rotate. 1. Wiring mistake
(a) For open collector pulse
train input, 24VDC
power is not supplied to
OPC.
(b) LSP and LSN are not on.
2. No pulses is input.
Section 6.2 3 Enter input
command.
(Test operation)
Servo motor run in
reverse direction.
Check cumulative command
pulses.
1. Mistake in wiring to
controller.
2. Mistake in setting of
parameter No. 54.
Chapter 5