Operating instructions

SIMATIC Panel PC 677B
Operating Instructions, 05/2007, A5E01035609-01
97
Maintenance and service
12
12.1 Maintenance
Scope of maintenance
The device is largely maintenance-free. If the functioning of components, such as the backup
battery, has been impaired after a limited period of operation, they must be replaced. Please
see the relevant chapters of these operating instructions for detailed information.
When working in areas where there is dust that may be hazardous to functionality, the
device must be operated in a control cabinet with a heat exchanger or with suitable supply
air.
Note
Dust deposits must be removed at regular intervals.
Maximum dust content in the air circulating in the cabinet
Suspended component 0.2 mg/m
3
Deposits 1.5 mg/m
3
/h
Repairs
Only authorized personnel are permitted to repair the device.
Warning
Unauthorized opening of and improper repairs to the device may result in substantial
damage to equipment or risk of personal injury to the user.