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Maintenance
9.1 Inspection and maintenance
9.1.7.10
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 before you repair any paint damage. They will provide you with
more information about the correct paint system and methods of repairing paint damage.
Complete overpainting
The paint applied must conform to the requirements to avoid electrostatic charging. See
DIN EN 60079-0. The repair of painted surfaces of the non-conductive paint coating up to a
nominal coating thickness of 350 μm was investigated and is acceptable.
9.1.7.11
Repainting
Repainting explosion-proof motors
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 coating thickness according to the explosion protection group:
● Limit the surface resistance of the paint used:
● Breakdown voltage ≤ 4 kV for explosion group III (dust only)
96
WARNING
– IIB: Total paint coating thickness ≤ 2 mm
– IIC: Total paint coating thickness ≤ 0.75 mm for motors of group II (gas)
– III: Total paint coating thickness ≤ 0.45 mm for group III motors (dust)
According to tests, paint repair work up to the total paint coating thickness of the non-
conductive paint coating listed has also been examined and is harmless.
– IIB, IIC, III: Surface resistance ≤ 1 GΩ for motors of groups II and III (gas and dust)
LOHER CHEMSTAR 1PS5
Operating Instructions 03/2014
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