Specifications

8
8. TROUBLESHOOTING
8– 11
CN1B-
19 pin
Display
A. 50
CN1A-
18 pin
CN1A-
19 pin
011
Name Definition ActionCause
Overload 1
Change the servo
motor.
5. Encoder faulty.
Checking method
When the servo motor shaft is
rotated slowly with the servo off,
the cumulative feedback pulses
should vary in proportion to the
rotary angle. If the indication
skips or returns midway, the
encoder is faulty.
Alarm Code
A. 51 0 1 1 Overload 2 Machine collision
or the like caused
max. output
current to flow
successively for
several seconds.
Servo motor
locked:
1s or more
1. Review
operation
pattern.
2. Install limit
switches.
1. Machine struck something.
Connect correctly. 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.
1. Repeat acceleration/
deceleration to execute
auto tuning.
2. Change auto tuning
response level setting.
3. Set auto tuning to OFF
and make gain
adjustment manually.
3. Servo system is instable and
hunting.
Checking method
When the servo motor shaft is
rotated slowly with the servo off,
the cumulative feedback pulses
should vary in proportion to the
rotary angle. If the indication
skips or returns midway, the
encoder is faulty.
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.
Change the servo
motor.
4. Encoder faulty.