121
Preventive Maintenance
3ADW000488R0101 DCS880 Service manual e a
3 years preventive maintenance
Following additional actions have to take place:
−
Replace the cooling fans of units H7 and H8:
−
−
The manufacturer’s estimation for the operational time of the cooling fans is:
−
GR28C-2DK 30,000 hours at 40°C.
−
GR35C-2DD 30,000 hours at 40°C.
The mayor problem is the failure of the bearings. The cooling fans are used in:
DCS880-S0b-1900-dd …
DCS880-S0b-3000-dd
H7
GR28C-2DK
400 V / 500 V
DCS880-S0b-2050-dd …
DCS880-S0b-5200-dd
H8
GR35C-2DD
400 V
Aging of the components result in:
−
Increased vibration due to the imbalance of the cooling fan (can last for several months).
−
Increased temperature due to the stopped cooling fan (drive trips with overtemperature).
−
Check the tightness of all terminals.
−
All connections should be inspected and
checked for tightness.
−
Check the condition of the contactors and
relays.
−
Contactors and relays should be checked
for proper function.
−
Check the fiber optic cables and their
connections.