Panasonic MINAS A6 Series - Origin Point Slips; Abnormal Motor Noise or Vibration

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3. Troubleshooting
When in Trouble
Origin Point Slips
Classication Causes Measures
System Z-phase is not detected. Check that the Z-phase matches to the center of proximity dog.
Execute the homing matching to the controller correctly.
Homing creep speed is fast. Lower the homing speed at origin proximity. Or widen the origin
sensor.
Wiring Chattering of proximity sensor
(proximity dog sensor) output .
Check the dog sensor input signal of the controller with
oscilloscope.
Review the wiring near to proximity dog and make a noise measure
or reduce noise.
Noise is on the encoder line. Reduce noise (installation of noise lter or ferrite core), shield
treatment of I/F cables, use of a twisted pair or separation of power
and signal lines.
No Z-phase signal output. Check the Z-phase signal with oscilloscope. Check that the Pin-
13 of the connector, connector X4 is connected to the earth of the
controller. Connect the earth of the controller because the open
collector interface is not insulated. Replace the motor and driver.
Request for repair.
Miswiring of Z-phase output. Check the wiring to see only one side of the line driver is connected
or not. Use a CZ output (open collector if the controller is not
differential input.
6
3. Troubleshooting
When in Trouble
Abnormal Motor Noise or Vibration
Classication Causes Measures
Wiring Noise is on the speed command. Measure the speed command inputs of Pin-14 and 15 of the
connector, Connector X4 with an oscilloscope. Reduce noise
(installation of noise lter or ferrite core), shield treatment of I/F
cables, use of a twisted pair, separation of power and signal lines.
Adjustment Gain setup is large. Lower the gain by setting up lower values to Pr1.01 and 1.06, of
velocity loop gain and Pr1.00 and Pr1.05 of position loop gain.
Installation Resonance of the machine and
the motor.
Re-adjust Pr1.04 and 1.09.
Check if the machine resonance exists or not with frequency
characteristics analyzing function of the PANATERM. Set up the
notch frequency to Pr2.01, Pr2.04, Pr2.07,Pr2.10 or Pr2.24
if resonance exists.
Motor bearing Check the noise and vibration near the bearing of the motor while
running the motor with no load. Replace the motor to check.
Request for repair.
Electro-magnetic sound, gear
noise, rubbing noise at brake
engagement, hub noise or
rubbing noise of encoder.
Check the noise of the motor while running the motor with no load.
Replace the motor to check. Request for repair.
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