6.2. Trouble Symptoms and Possible Causes

6.2. Trouble Symptoms and Possible Causes

 

As shown in [Table 6-1], there may be many parts as the cause of one phenomenon.

Refer to next page to determine which part is malfunction.

 

Table 6‑1 Trouble phenomenon and cause

 

Location of abnormality   Symptoms of the trouble	Reducer	Brake	Motor	Encoder	Backlash	Grease	Gas spring
Overloaded     [Note 1]	○	○	○				○
Position deviated	○	○	○	○			○
Abnormal sound generated	○	○	○			○ [Note 3]	○
Vibration during operation        [Note 2]	○		○			○ [Note 3]
Trajectory deviated	○			○			○
Axis freefalling	○	○					○
Abnormal heating	○	○	○	○
False operation, runaway				○

 

[Note 1] Overloaded -------- A phenomenon that occurs when a load exceeding the conditions

of the rated specification of the motor is applied.

                        Specifically, it occurs when the temperature relay or circuit breaker is cut off.

[Note 2] Vibration during operation ------- Vibration that occurs during operation.

[Note 3] If an abnormal sound is generated in the reducer part during operation at low speed, check the condition for 1 to 2 days while performing operation. The abnormal sound usually disappears.

It can be checked that the abnormal sound will disappear even when the concerned axis is operated at high speed for about 5 to 10 minutes or more.

When the old grease is discharged as much as possible (about 90% or more) and replaced with new grease, abnormal grease sound can be minimized (When the grease is discharged while the axis is rotating at low speed, the grease discharge time can be shortened.)

 

Abnormal sound usually occurs in the following cases:

1.    During operation after replacement of grease/reducer

2.    During operation after a long-term non-operation

3.    During operation at low speed

4.    During operation at low temperature

5.    When using unspecified grease

6.    Mixing of grease of different specifications