9.3.13 Repainting
WARNING
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 coating thickness according to the explosion protection group:
– IIB: Total paint coating thickness ≤ 2 mm
– IIC: Total paint coating thickness ≤ 0.75 mm for machines of Group II (gas)
– III: Total paint coating thickness ≤ 0.45 mm for Group III machines (dust)
According to tests, paint repair work up to the total paint coating thickness of the non-
conductive paint coating listed has also been investigated and is harmless.
● Limit the surface resistance of the paint used:
– IIB, IIC, III: Surface resistance ≤ 1 GΩ for machines of groups II and III (gas and dust)
● Breakdown voltage ≤ 4 kV for machines, Groups II and III (gas and dust)
● Limiting the charge transfer:M
– IIB: Limit value for the highest transferred charge < 25 nC
– IIC: Limit value for the highest transferred charge < 10 nC for Group II machines (gas)
– III: Limit value for the highest transferred charge < 200 nC for Group III machines (dust)
● Incapability, dangerous charge to be saved:
– IIB: Limit value for the maximum capacity ≤ 10 pF
– IIC: Limit value for the maximum capacity ≤ 3 pF for Group II machines (gas)
– III: Limit value for the maximum capacity ≤ 10 pF for Group III machines (dust)
9.4 Corrective Maintenance
9.4.1 Safety instructions for repair work
Observe the following when carrying out any work on the machine:
● Comply with the general safety instructions (Page 13)
● Comply with the applicable national and sector-specific regulations.
● When using the machine within the European Union, comply with the specifications laid
down in EN 50110‑1 regarding safe operation of electrical equipment.
Maintenance
9.4 Corrective Maintenance
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
94 Operating Instructions 06/2018
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