Siemens 1LA8, Руководство по эксплуатации

Страница: 111 / 174

● Limit the total paint coating 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
– 30 nC for Group IIB devices
– 10 nC for Group IIC devices
– 200 nC for Group III devices
● Breakdown voltage ≤ 4 kV for explosion group III (dust only)
Suitability test of the paint system for hazardous areas
Proof is available for the electrostatic suitability with explosion-proof machines for the paint
systems ordered by default. Such evidence is not available for paint systems that are non-
standard or specifically requested by customers. Take into consideration that the provided
evidence is not valid for repaintings.
9.1.14 Maintaining terminal boxes
Requirement
The machine is de-energized.
Checking the terminal box
● Terminal boxes must be regularly checked for tightness, undamaged insulation, and tight
terminal connections.
● If dust or humidity have infiltrated the terminal box, this should be cleaned and dried
(particularly the insulators).
Check all the seals and sealing surfaces and address the cause of the leakiness.
Maintenance
9.1 Inspection and maintenance
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014
111