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6. TROUBLESHOOTING
6 - 5
Display Name Definition Cause Action
50 Overload1 1. Servo amplifier is used in excess of
its continuous output current.
1. Reduce load.
2. Check operation pattern.
3. Replace direct drive motor that provides
larger output.
Load exceeded
overload protection
characteristic of servo
amplifier.
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. Check operation pattern.
2. Install limit switches.
4. Wrong connection of direct drive
motor. Servo amplifier's power
supply output (U, V, and W) do not
match direct drive motor's power
supply input (U, V, and W).
Connect correctly.
5. Encoder faulty.
Checking method
When the direct drive motor rotor
is rotated with the servo-off, the
cumulative feedback pulses do
not vary in proportional to the
turning angle in the rotor, and the
indication skips or returns
midway.
Replace the direct drive motor.
6. Initial magnetic pole detection has
not been performed.
Perform initial magnetic pole detection.
7. After Overload 2 (51) occurred, turn
off/on the power supply to clear the
alarm. Then the overload operation
is repeated.
1. Reduce load.
2. Check operation pattern.
3. Replace direct drive motor that provides
larger output.
51 Overload2 1. Machine struck something. 1. Check operation pattern.
2. Install limit switches.
2. Wrong connection of direct drive
motor. Servo amplifier's power
supply output (U, V, and W) do not
match direct drive motor's power
supply input (U, V, and W).
Connect correctly.
Machine collision or
the like caused max.
output current to flow
successively for
several seconds.
For the time of the
alarm occurrence,
refer to the section
8.1.
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.
4. Encoder faulty.
Checking method
When the direct drive motor rotor
is rotated with the servo-off, the
cumulative feedback pulses do
not vary in proportional to the
turning angle in the rotor, and the
indication skips or returns
midway.
Replace the direct drive motor.
5. Initial magnetic pole detection has
not been performed.
Perform initial magnetic pole detection.