Alarms 3051 To 3054 (Excessive Position Lag) - YASKAWA YASNAC i80 Maintenance Manual

Spindle alarms

4.2.12 ALARMS 3051 TO 3054 (EXCESSIVE POSITION LAG)

Excessive position lag results when the lag of machine
to command value exceeds parameter pm1351 to pm3054.
Table 4.14
Cause of Trouble
Motor load is too large
and movement commanl
is too small.
e.g.
Excessive drilling Ioal
Machine requires
lubricant.
Program error causes
tool/work contact.
Torque is not applied.
D/A circuit failure
(output continues )
Failure of spindle
controller (speed com-
mand continues)
Wiring failure
Incorrect setting of PG
magnification
Too low setting of Kp
(position loop gain)
causes excessive positioI
lag. ---
Alarms 3051 to 3054 (Excessive Position Lag : spindle)
Check Method
monitor if an alarm occurs during idle
reverse) at log or rapid mode after
turning ON the power.
machine and check oil level in tank.
current. (For details, refer to the
spindle controller manual. )
Determine correct PG magnification
'rem PG pulse count, gear ratio, ball-
Solution
[f the cause is in the
machine, correct the
trouble and restart
operation.
Correct torque
limitation.
Replace spindle drive.
Replace the spindle
motor.
Replace model JANCD-
Replace the spindle
controller unit.
Refer to Section 12 of
YASNAC i80 Connecting
Manual (TOE-C843-11.5).
Set correct PG
magnification.
If the setting is much
smaller than the standard
value set by machine
manufacturer, enlarge
parameter pm1417 (lst-
spindle axis), pm1437 (2nd-
spindle axis), pm1457 (3rd-
spindle axis) and pm1477
(4th-spindle axis). See
Section 5 for Kp adjustment
method. For details, contact
machine manufacturer.
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