Maintenance
9.2 Inspection and maintenance
1MB..5/6 shaft height 71 ... 355
114 Operating Instructions, 07/2020, A5E41926185A
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.
9.2.8.8 Maintaining terminal box "Ex d"
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.
Short-circuits can occur as a result of damaged components that can lead to death,
serious injury or material damage.
Replace damaged components.
9.2.8.9 Repainting
When you recoat painted surfaces, you must strictly comply with one of the following
requirements relating to the complete system, original paint plus paint used for recoating:
• Limit the total paint film thickness according to the explosion protection group:
– IIA, IIB: Total paint coating thickness ≤ 2 mm
– IIC: Overall coating thickness ≤ 0.2 mm for motors of group II (gas)
• Strictly limit the surface resistance of the paint system used:
– Surface resistance ≤ 1 GΩ for motors of groups II and III (gas and dust)
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