Fanuc Power Mate i-D/H Maintenance Manual

B63175EN/03
7. TROUBLESHOOTING
431
Does deceleration sig-
nal *DECα change
between grids ?
By 1 grid ?
YES
NO
(START)
Length of
deceleration
dog sufficient ?
YES
NO
Exchange dog.
As a temporary work,
lower rapid traverse
rate in reference posi-
tion return
YES
Limit switch for *DEC
a is faulty (variation is
large).
As a temporary work,
lower FL rate in refer-
ence position return.
Wrong mounting position
· Pulse coder is
faulty
· Servo control
module is faulty.
Does machine return
to original position by
power OFF ?
YES
NO
Confirm connection
between servo
motor and machine
Is 5V of pulse
coder correct ?
OFF
Confirm cable
NO
YES
*Voltage drop
between +5V and 0V
should be less than
0.2V
Note)
NOTE
If zero point adjustment is made by grid shifting, the grids
themselves are shifted. It is necessary to confirm that the
*DECα deceleration signal changes almost at a midpoint
between shifted grids.
7.10
REFERENCE
POSITION DEVIATES

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