Fanuc Power Mate i-D/H Maintenance Manual

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Alarm No.: Alarm Description Possible cause Action
Detailed
troubleshooting
method
380: BROKEN LED(EXT) LED disconnection
382: COUNT MISS(EXT)
Position data count
error
383: PULSE MISS(EXT)
Small internal
signal amplitude
384: SOFT PHASE
ALARM(EXT)
Position data alarm
- Detector failure
Replace the
detector.
(4)
385: SERIAL DATA
ERROR(EXT)
Communication
interruption
- Cable disconnection
- Noise
- Detector failure
Check the cable.
Check the effect
of noise.
Replace the
detector.
(2)
(1)
(4)
386: DATA TRANS.
ERROR(EXT)
Communication
data alarm
- Noise
Check the effect
of noise.
(1)
381: ABNORMAL PHASE
(EXT)
387: ABNORMAL
ENCODER(EXT)
For details, contact the machine tool builder or detector manufacturer.
1.2.5.3 Detailed troubleshooting methods
(1) Checking the effect of noise
Check the value on the diagnostics screen DGN356 (for a built-in detector) or DGN357 (for a separate detector) of the CNC unit.
Normally, 0 is displayed. However, if the position data from the Pulsecoder becomes unstable due to noise or some other factor,
this value is incremented. The value is cleared when the CNC unit is powered off. Immediately after the power is turned on, 0 is
displayed.
(2) Checking the cable
Check whether the feedback cable is not disconnected and whether the connector is properly plugged.
(3) Replacing the Pulsecoder
(3)-1 Pulse coder replacement procedure
<1> Remove the four M4 hexagon socket head cap screws
fastening the Pulsecoder. The M3 bolts fastening the
Pulsecoder cover do not need to be loosed. (See the figure
at right.)
<2> Remove the Pulsecoder and Oldham's coupling (see the following figure).
<3> Set the new Pulsecoder and Oldham's coupling on the motor.
Adjust the direction of the mate Oldham's coupling to that of
the Oldham's coupling so that the teeth are engaged.
Push in the Pulsecoder until the O ring fits in the joint between
the motor and Pulsecoder. Take care so that the O ring of the
Pulsecoder is not bitten.
Bolt fastening the Pulsecoder cover M3
× Do not loosen
Remove
Oldham's coupling
Mate Oldham's coupling
O ring
A
djust the connector direction
Bolt fastening the Pulsecoder M4

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