Maintenance
9.2 Inspection and maintenance
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
123
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 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)
● Limit the surface resistance of the paint used:
– Surface resistance ≤ 1 GΩ for motors of groups II and III (gas and dust)
● Charge transfer limit
– 60 nC for Group I or Group IIA devices
– 25 nC for Group IIB devices
– 10 nC for Group IIC devices
– 200 nC for Group III devices (values not valid for strongly charge generating
processes)
● Breakdown voltage ≤ 4 kV for explosion group III (gas and dust)
Risk of explosion as a result of processes with high levels of electrostatic charging
For paint finishes in explosion group III, the paint can be electrostatically charged as a
result of intensive dust turbulence or processes with high levels of electrostatic charging.
Electrostatic discharges can occur. Minimize the risk of electrostatic charging by applying
effective measures according to IEC 60079-32-1. This can result in death, serious injury or
material damage.
shes for IIC are optionally available with more than 200 µm coat thickness.
Paint finishes exceeding 200 µm are tested with respect to electrostatic charging.
Motors with a coating thickness exceeding 200 µm may only be painted over if the conditions
ment
ioned above are complied with.
Suitability test of the paint system for hazardous areas
Suitability certificates for the electrostatic suitability on explosion-protected machines are
available for paint systems ordered as standard. These certificates are not available for non-
standard or customized paint systems. Take into consideration that the provided evidence is
not valid for repaintings.
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