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
specied in the operating instructions for the separately driven 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 ServiceCenter (Page12) 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.
9.2.14.1 Repainting
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 lm thickness according to the explosion protection group:
– IIA, IIB: Total paint coating thickness ≤2mm
– IIC: Overall coating thickness ≤0.2mm for motors of group II (gas)
• Strictly limit the surface resistance of the paint system used:
– ≤ 1GΩ, measured at 50 ± 5% relative humidity
– ≤ 100GΩ, measured at 30 ± 5% relative humidity for motors, Groups II and III (gas and
dust)
• Charge transfer limit
– 60nC for Group I or Group IIA devices
– 25nC for Group IIB devices
– 10nC for Group IIC devices
– 200nC for Group III devices (values not valid for strong charge generating processes)
• Breakdown voltage ≤4kV for explosion groups II and III (gas and dust)
Maintenance
9.2Inspection and maintenance
1MB..1/2/3/4 - shaft heights 63 ... 355
126 Operating Instructions, 11/2023, A5E52779900A
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