YASKAWA YASNAC i80, Maintenance Manual

Page: 107 / 226

4.2.15 ALARMS 3091 TO 3094 (SPINDLE PG DISCONNECTION
ERROR)
Signal wire disconnection of A, B, and C phases from
spindle PG.
Table 4.17 Alarm 3091 PG Disconnection Error)
Cause of Trouble
Disconnection or
contact failure of signal
wire between NC unit
and spindle controller
No shorting plug
connector even without
spindle PG.
Failure of PG detector
circuit connection
PG failure
Check Method
●
Check for looseness and removal of
model JANCD-FC31O board connectors
CN34 ( spindle FB).
●
Check for looseness and/or removal of
spindle controller.
●
Perform wiring check according to
Connecting Manual (T .5).
Shorting plug connector to CN34 or CN36
(with 2nd spindle) at model JANCD-FC31O
board is required for such specifications
without spindle PG.
Check whether this alarm occurs when main
power is applied even though results of
check for above items are normal.
If alarm occurs at slow rotation, PG may be
defective.
Solution
●
Correct for looseness
and/or removal of
connectors.
●
Correct wiring as
necessary.
Mount shorting plug
connector.
Replace FC31O (or
FC260). Contact your
Y A S K A W A
representative.
Replace PG.
4.2.16 ALARMS 3121 TO3128 (EXCESSIVE SPEED)
These alarms are detected when a command for excessive
speed is issued and motor rotation speed exceeds 1.2
times the maximum rotation speed.
Table 4.18 Alarms 3121 to 3125 (Excessive Speed)
Cause of Trouble
I
Check Method
I
Solution
Erroneous wiring of
motor
Erroneous wiring of
encoder
The movement distance
per motor rotation is
specified incorrectly.
Check wiring according to YASNAC i80 If erroneous wiring is
Connecting Manual (T .5). found, correct the wiring.
Check wiring according to YASNAC i80 If erroneous wiring is
Connecting Manual found, correct the wiring.
Feed at low speed such as in handle mode,
etc. It will be normal if the actual
movement distance equals the position
display change distance.
Determine correct move
ment distance
to per motor,
rotation from gear ratio
and ball-type screw pitch.
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