Panasonic MDDDT5540 - Manual (Page 72)

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The initial (home) position varies.
Troubleshooting
C a u s e s
W h e n c a l c u l a t i n g t h e i n i t i a l
( h o m e ) p o s i t i o n , t h e Z - p h a s e
output is not detected.
Creep speed to initial position is
too high.
The output of the initial (home)
position proximity sensor (dog
sensor) is chattering.
Noise on encoder wires
Z-phase signal is not output.
The circuit for Z-phase signal is
not correct.
C o u n t e r m e a s u r e s
Check that the Z-phase accords to the center of
the proximity dog. Perform initialization correctly
according to the controller.
Decrease the return speed near the initial (home)
position, or lengthen the initialization sensor.
Check the input to the sensor using an oscilloscope.
Modify the wiring around the sensor. Take measures
to reduce the noise.
Take measures to reduce the noise (noise filters,
ferrite cores, etc.). Properly connect the shield wires
of I/F cables. Use twist-paired wires. Separate the
signal and power wires.
Monitor the Z-phase signal using an oscilloscope.
Check that the ground terminal 14 of CN I/F CZ (Z
phase signal open collector output) is connected to
the ground terminal of the controller. Replace the
amplifier and controller, or repair them.
Check that the line amplifier is connected at the both
sides. If the controller does not have a differential in-
put, use CZ (Z phase signal open collector output).
C a t e g o r y
S y s t e m
Wiring