Maintaining Terminal Boxes "Ex Db - Siemens SIMOTICS XP Operating Instructions Manual

Maintenance
9.1 Inspection and maintenance
To avoid unnecessary downtimes, always carry out all inspection and maintenance work on
the main and external fan motor simultaneously.
• Occasionally inspect the external fan motor, and check it electrically and mechanically
every time the rolling bearings are replaced.
• Replace permanently lubricated rolling bearings in the external fan motor as specified in
the operating instructions for the external fan motor.
9.1.8.8

Maintaining terminal boxes "Ex db"

Requirement
The machine is de-energized.
Check the terminal box
• Terminal boxes must be regularly checked for tightness, undamaged insulation, and tight
terminal connections.
• If dust or humidity have infiltrated the terminal box, this should be cleaned and dried
(particularly the insulators).
Check all the seals and sealing surfaces and address the cause of the leakiness.
• Check the insulators, connectors and cable connections in the terminal box.
• Line entries inside the terminal box are part of the regular inspection in accordance with
IEC/EN 60079-17.
• Replace the damaged components if necessary.
114
WARNING
Short-circuit hazard
Short-circuits can occur as a result of damaged components that can lead to death,
serious injury or material damage.
Replace damaged components.
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 10/2021, A5E41926185A