Touch Up Any Damaged Paintwork; Repainting - Siemens SIMOTICS SD Operating Instructions Manual

Maintenance
9.1 Preparation and notes
9.1.3

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.
9.1.4

Repainting

Explosion danger caused by incorrect painting
If the paint coat thickness exceeds the permissible thickness, then electrostatic discharge
can occur and associated discharge. At this instant, if there is any explosive mixture that
can be easily ignited, then an explosion can occur resulting in death, severe injury and
material damage.
When repainting/touching up, avoid excessively thick paint coatings. You can determine the
permissible coating thickness of the paint depending on the explosion group and the
surface resistance of the paint.
You must comply with one of the following requirements when you repaint painted surfaces:
● Limit the total paint coating thickness in accordance with the explosion protection group:
– IIA, IIB: Total paint coating thickness ≤ 2 mm
– IIC: Total paint coating thickness ≤ 0.330 mm for motors of group II (gas)
● Limit the surface resistance of the paint used:
– IIA, IIB, IIC, III: Surface resistance ≤ 1 GΩ for machines of groups II and III (gas and
● Breakdown voltage ≤ 4 kV for explosion group III (dust only)
● An overall coating thickness of > 120 µm is inadmissible for processes which generate
strong charges.
90
WARNING
dust)
Operating Instructions, 05/2014, 5 610 00000 02 000
Low-voltage motors