CHAPTER 7 MAINTENANCE AND INSPECTION

20. Encoder Overheat

[Display]

EH

[Description of detected alarm]

The encoder inside the servomotor is overheated exceeding the

allowable temperature.

[Cause and remedy]

Cause

Excessive ambient temperature

The effective torque exceeds the

rating.

Remedy

 Reduce the ambient temperature of the servomotor to

40°C or lower.

 Remove shields interrupting heat radiation, if there

are any.

Increase the cycle time and reduce the operation

frequency.

21. Absolute Data Lost

[Display]

7

DL1

DL2

DL3

[Description of detected alarm]

The absolute data of the encoder is lost.

 dL1: Battery voltage drop, broken encoder cable

 dL2: Multi-turn data fault in encoder

 dL3: Detection at power-on after an ET alarm

[Cause and remedy]

Cause

Remedy

dL1 alarm

 Check for the broken wire or wrong wiring in the

encoder cable and correct.

 Replace the battery.

 A warning is displayed on the amplifier if the battery

voltage is low. (If PA2_78 is set at 1)

dL2 alarm

Perform position preset. If the alarm persists, replace the

servomotor.

dL3 alarm

After position preset, dL3 is cleared but the ET alarm

persists.

If the ET alarm is not cleared, replace the servomotor.

For details, refer to "CHAPTER 11 ABSOLUTE POSITION SYSTEM."

7-14 Troubleshooting Method