Maintenance and Inspection
‑168‑
Disconnect the optional grounding screw of VDR before performing a voltage resistance
test. Otherwise, the test may fail.
7.3 Replacing Quick-Wear Parts
7.3.1 Service Life of Quick-Wear Parts
The quick‑wear parts of the AC drive include the cooling fan and filter electrolytic
capacitor. Their service life is closely related to the ambient environment and
maintenance condition. Generally, the service life is as follows.
Name
Service Life Time
[Note]
Fan
≥ 5 years
Electrolytic capacitor ≥ 5 years
Note:
The service life indicates the time when the part is used in the following conditions. You
can determine when to replace the part according to the actual operating time.
Ambient temperature: 40℃
Load rate: 80%
Operating rate: 24 hours per day
7.3.2 Replacing the Fan
Cooling fans
● The fan may be damaged due to worn‑out bearing or aging blades.
● Criteria for determining fan damage: cracks on the blade, unusual vibration noise
upon start, and improper operation of fan blades
● Replacement of the fan: Press the snap‑fit joint on the fan plastic cover and pull
the fan outward. After replacing the fan, ensure the fan blows the air upwards.
Table 7–1 Number of cooling fans
Structure
Fan Quantity
T1 (0.4 kW to 1.1 kW)
/
T1 (1.5 kW to 3.0 kW)
T2
T3 (7.5 kW)
T5 and T7
1
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