Troubleshooting; Trouble At Start-Up; Position Control Mode - Mitsubishi Electric MR-J2S-A Instruction Manual

10. TROUBLESHOOTING

10. TROUBLESHOOTING

10.1 Trouble at start-up

CAUTION
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
1 Power on
Alarm occurs.
2 Switch on servo-on Alarm occurs.
(SON).
Servo motor shaft is
not servo-locked
(is free).
3 Enter input Servo motor does
command. not rotate.
(Test operation)
Servo motor run in
reverse direction.
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.
Fault Investigation
LED is not lit. Not improved if connectors
LED flickers. CN1A, CN1B, CN2 and CN3
are disconnected.
Improved when connectors
CN1A and CN1B are
disconnected.
Improved when connector
CN2 is disconnected.
Improved when connector
CN3 is disconnected.
Refer to section 10.2 and remove cause.
Refer to section 10.2 and remove cause.
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.
Check cumulative command
pulses.
10 - 1
WWW.NNC.IR
Possible cause
1. Power supply voltage fault
2. Servo amplifier is faulty.
Power supply of CNP1 cabling
is shorted.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
Power supply of CN3 cabling is
shorted.
1. Servo-on (SON) is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
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.
1. Mistake in wiring to
controller.
2. Mistake in setting of
parameter No. 54.
Reference
Section 10.2
Section 10.2
Section 6.6
Section 6.2
Chapter 5