YASKAWA YASNAC i80, Maintenance Manual

Page: 104 / 226

4.2
TROUBLESHOOTING BY ALARM CODES (Cent’d)
4.2.11 ALARMS 3041 TO 3048 (EXCESSIVE POSITION LAG)
Excessive position lag results when the lag of machine
to command value exceeds 120% at 100% rapid traverse
rate.
Table 4.13
Cause of Trouble
Motor load is too large
and movement command
is too small.
e.g.
●
Excessive drilling load
●
Machine requires
lubricant.
●
Program error causes
tool/work contact.
Torque is not applied.
Wiring failure
The movement distance
per motor rotation is
specified incorrectly.
Check Method
●
Observe motor current or torque
monitor if alarm occurs during idle
running
direction at jog or rapid
mode after turning ON the power.
●
Check oil film on slide surface of
machine and check oil level in tank.
●
Check torque limit parameters
to pm1678, to
signal.
●
Check torque reference on monitor
board.
Check wiring.
Refer to Connecting Manual (T0E-C843-
11.5).
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.
Solution
Restart
operation if
machine remove the
trouble.
●
Correct torque
limitation.
●
Replace AC SERVOPACK.
●
Replace the motor
Refer to Connecting
Manual Par. 11.
Connection of Feed
Servo Unit.
Determine correct move-
ment distance
to
per motor
rotation from gear ratio
and ball-type screw pitch.
94