YASKAWA yasnac lx3 - Page 29

4.2.12 ALARMS341 AND342 (Servo Error)
to commandvalue exceeds parameter #i6074 (X-
axis) and #7075 (Z-axis).
Servo error results when the lag of machine
Trouble
Motor load is too
large and movement
commandis too small.
E.g.
“ Excessive drilling
load
● Machine requires
lubricant.
“ Program error causes
tool/work contact.
Torque is not applied.
D/A circuit failure
(output continues)
Servopack failure
(speed commandcontin-
ues. )
Wiring failure
Kp(position loop gain)
is not correctly
adjusted and it causes
excessive position lag
Check Method
.
.
—
Observe motor current or torque monito;
if alarm occurs during idle running
@/t3 direction atjogor rapid mode
after turning ONthe power.
Check oil film on slide surface of
machine and check oil level in tank.
● Check torque limit signal.
● Check torque monitor and motor current
Measure check terminal (IN-M) of
Servopack with servo power OFF.
It is faulty if the voltage exceeds
several 10 mVat this status.
Whenservo power is on, the machine runs
away, causes alarm and stops.
Determine if KP value from the POS(ER)
display at the time of jog and rap’
feed is correct.
F=mm/min
F
‘P=16”7 x POS(ER)
(s-’)
d
Solution
If machine Remove, trouble
and restart operation.
● Correct torque limita-
tion.
● Replace Servopack.
“ Replace the motor.
Replace main board (MI120)
of CPUunit.
Replace Servopack.
Refer to Connection Manual
par. 12. Connection of
Feed Servo Unit.
Adjust value by VR (LX3)
of Servopack if the va
is less than the value
as standard by machine
manufacturer.
ue
set
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