ABB DCS880 - 3 Years Preventive Maintenance

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:
− Exchange cooling fan size H7.
− Exchange cooling fan size 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.