Mitsubishi Electronics TM-RFM ユーザーズマニュアル

6. TROUBLESHOOTING

6 - 5

Display Name

Definition

Cause

Action

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.

Overload2

1. Machine struck something.