6.2. Symptoms and Causes of Troubles
6.2. Symptoms and Causes of Troubles
As shown in [Table 6-1], there can be multiple parts that are thought to be the cause of a single phenomenon.
Please refer to the next page to determine which parts are damaged.
Table 6‑1Symptoms and Causes of Troubles
Location of abnormality Symptom of the trouble | Reducers | Brakes | Motors | 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 and 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 min 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 occur 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