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● There must be a clearance of at least 1 x air intake diameter in the axial direction.
● A uniform gap must be maintained between the impeller and the air intake assembly.
Servicing the external fan motor
● Perform an occasional visual inspection of the external fan motor and check it electrically
● Replace the permanently lubricated rolling bearing on the external fan motor after
9.1.14
Touch up any damaged paintwork
If the paint is damaged, it must be repaired in order to protect the unit against corrosion.
Note
Paint system
Contact the Service Center (Page 181) before you repair any paint damage. They will provide
you with more information about the correct paint system and methods of repairing paint
damage.
9.1.15
Repainting
Explosion hazard caused by incorrect painting
The paint coat can become electrostatically charged where there is a thick coat. Electrostatic
discharges can occur. There is a risk of explosion if potentially explosive mixtures are also
present at this moment. This can result in death, serious injury or material damage.
You must comply with one of the following requirements when you repaint painted surfaces:
● Limit the total paint film thickness according to the explosion protection group:
● Limit the surface resistance of the paint used:
SIMOTICS FD 1MN1
Operating Instructions 02/2019
and mechanically every time the roller bearings are replaced.
40,000 operating hours or five years at the latest.
WARNING
– IIA, IIB: Total paint coating thickness ≤ 2 mm
– IIC: Overall coating thickness ≤ 0.2 mm for motors of group II (gas)
– Surface resistance ≤ 1 GΩ for motors of groups II and III (gas and dust)
Maintenance
9.1 Inspection and maintenance
141
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