LNS QUICK SIX - Page 44

Chapter 1: Alarms
QUICK SIX
1-41
Display Name Definition Cause Action
1. Servo amplifier faulty. Change the servo amplifier.
2. The power supply was turned
on and off continuously by
overloaded status.
The drive method is reviewed.
AL.45 Main circuit
device overheat
Main circuit device
overheat
3. Air cooling fan of servo
amplifier stops.
1. Exchange the cooling fan or the
servo amplifier.
2. Reduce ambient temperature.
1. Ambient temperature of servo
motor is over 40°C.
Review environment so that ambient
temperature is 0 to 40°C.
2. Servo motor is overloaded. 1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
AL.46 Servo motor
overheat
Servo motor
temperature rise
actuated the
thermal protector.
3. Thermal protector in encoder is
faulty.
Change servo motor.
1. Servo amplifier is used in
excess of its continuous output
current.
1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
2. Servo system is instable and
hunting.
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.
3. Machine struck something. 1. Review operation pattern.
2. Install limit switches.
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.
Connect correctly.
AL.50 Overload 1 Load exceeded
overload protection
characteristic of
servo amplifier.
Load ratio 300%:
2.5s or more
Load ratio 200%:
100s or more
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.
Change the servo motor.
1. Machine struck something. 1. Review operation pattern.
2. Install limit switches.
2. Wrong connection of servo
motor. Servo amplifier's output
terminals U, V, W do not match
servo motor's input terminals U, V,
W.
Connect correctly.
3. Servo system is instable and
hunting.
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.
AL.51 Overload 2 Machine collision or
the like caused
max. output current
to flow successively
for several
seconds.
Servo motor
locked: 1s or more
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.
Change the servo motor.