Maintaining Terminal Boxes "Ex Db - Siemens SIMOTICS XP 1MB 5/6 Series Operating Instructions Manual

Maintenance
9.2 Inspection and maintenance
Servicing the separately driven fan
The separately driven fan is essentially maintenance-free. However, dirt and dust deposits on the
impeller and the motor, particularly in the gap between the impeller and the inlet nozzle can
impair its function.
• Remove the dirt and dust deposits regularly; the intervals depend on how dirty the
surrounding area is.
• Make sure that the impeller is evenly cleaned if the impeller draws-in a free flow of air, as
irregular deposits can lead to an imbalance.
Full fan performance (flow rate) is only achieved if the impeller can draw-in a free flow of air.
Servicing the separately driven fan motor
Carefully comply with all specifications and intervals in the operating instructions for the
separately driven fan motor. If a SIMOTICS XP 1MB.. low-voltage motor is used as an separately
driven fan motor, these operating instructions also apply for the separately driven fan motor.
To avoid unnecessary downtimes, always carry out all inspection and maintenance work on
the main and separately driven fan motor simultaneously.
• Occasionally inspect the separately driven fan motor, and check it electrically and
mechanically every time the rolling bearings are replaced.
• Replace permanently lubricated rolling bearings in the separately driven fan motor as
specified in the operating instructions for the separately driven fan motor.
9.2.8.7

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.
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1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A