Maintenance
9.2 Inspection and maintenance
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 06/2020, A5E44455710A
119
Servicing the external fan
The external 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 external fan motor
Carefully comply with all specifications and intervals in the operating instructions for the
external fan motor. If a SIMOTICS XP 1MB.. low-voltage motor is used as an external fan
motor, these operating instructions also apply for the external fan motor.
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.
9.2.14
Repainting
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 159) before you repair any damage to paint. They will
provide you with more information about the correct paint system and methods of repairing
paint damage.
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 G
Ω
for motors of groups II and III (gas and dust)