LNS QUICK LOAD SERVO S3 T BARFEED Service Manual page 114

TROUBLESHOOTING
Display Error name
AL.51 Overload 2
AL.52 Error excessive
Definition
Load ratio 300%: 2. Servo system is instable and
2.5s or more hunting.
Load ratio 200%:
100s or more
3. Machine struck something.
4. Wrong connection of servo
motor.
Servo amplifier's output terminals
U, V, W do not match servo
motor's input terminals U, V, W.
5. Encoder faulty.
Checking method
When the servo motor shaft is
rotated with the servo off, the
cumulative feedback pulses do
not vary in proportion to the
rotary angle of the shaft but the
indication skips or returns
midway.
Machine collision or 1. Machine struck something.
the like caused
max. output current
to flow successively
for several seconds.
2. Wrong connection of servo
Servo motor locked:
motor.
1s or more
Servo amplifier's output terminals
U, V, W do not match servo
motor's input terminals U, V, W.
3. Servo system is instable and
hunting.
4. Encoder faulty.
Checking method
When the servo motor shaft is
rotated with the servo off, the
cumulative feedback pulses do
not vary in proportion to the
rotary angle of the shaft but the
indication skips or returns
midway.
The droop pulse 1. Acceleration / deceleration
value of the time constant is too small.
deviation counter
exceeded the
encoder resolution
2. Internal torque limit 1
10 [pulse].
(parameter No.28) is too small.
Cause
1. Repeat acceleration/
deceleration to execute
auto tuning.
2. Change auto tuning
response setting.
3. Set auto tuning to
OFF and make gain
adjustment manually.
1. Review operation
pattern.
2. Install limit switches.
Connect correctly
Replace the servo motor
1. Review operation
pattern.
2. Install limit switches.
Connect correctly.
1. Repeat
acceleration/deceleration
to execute auto tuning.
2. Change auto tuning
response setting.
3. Set auto tuning to
OFF and make gain
adjustment manually.
Replace the servo motor
Increase the
acceleration /
deceleration time
constant.
Increase the torque limit
value.
SERVICE MANUAL – QL Servo S3-T
Action