Trouble At Start-Up - Mitsubishi MR-JE-10A Instruction Manual

4. STARTUP

4.2.6 Trouble at start-up

CAUTION
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
(1) Troubleshooting
No. Start-up sequence
1 Power on
Alarm occurs.
2 Switch on SON Alarm occurs.
(Servo-on).
Servo motor shaft is
not servo-locked.
(Servo motor shaft is
free.)
3 Input command Servo motor does not
pulse (test rotate.
operation).
Servo motor run in
reverse direction.
4 Gain adjustment Rotation ripples (speed
fluctuations) are large
at low speed.
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
5 Cyclic operation Position shift occurs
Never make a drastic adjustment or change to the parameter values as doing so
will make the operation unstable.
POINT
Using the optional MR Configurator2, you can refer to reason for rotation failure,
etc.
Fault
7-segment LED is Not improved even if CN1 and
not lit. CN2 connectors are disconnected.
7-segment LED
flickers.
Improved when CN1 connector is
disconnected.
Improved when CN2 connector is
disconnected.
Refer to chapter 8 and remove cause.
Refer to chapter 8 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 (section 4.5.7) to see
if SON (Servo-on) is on.
Check the cumulative command
pulse on the status display
(section 4.5.3).
Make gain adjustment in the
following procedure.
1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration three times to
complete auto tuning.
If the servo motor may be driven
with safety, repeat acceleration
and deceleration three times to
complete auto tuning.
Confirm the cumulative command
pulses, cumulative feedback
pulses and actual servo motor
position.
Investigation
1. Power supply voltage fault
2. The servo amplifier is
Power supply of CN1 cabling is
shorted.
1. Power supply of encoder
2. Encoder is malfunctioning.
1. SON (Servo-on) is not input.
2. 24 V DC power is not
1. Wiring mistake
(a) For open collector pulse
(b) LSP and LSN are not on.
2. Pulse is not input from the
Mistake in setting of [Pr. PA13].
1. Mistake in wiring to controller.
2. Mistake in setting of [Pr.
Gain adjustment fault
Gain adjustment fault
Pulse counting error, etc. due to
noise.
4 - 7
Possible cause
malfunctioning.
cabling is shorted.
(wiring mistake)
supplied to DICOM.
train input, 24 V DC power
is not supplied to OPC.
controller.
PA14].
Reference
Chapter 8
Chapter 8
Section
4.5.7
Section
4.5.3
Chapter
5
Chapter
6
Chapter
6
(2) of
this
section