Maintaining Terminal Boxes - Siemens SIMOTICS FD 1MQ1 Operating And Installation Instructions

Maintenance
9.1 Inspection and maintenance
● Charge transfer limit
● Breakdown voltage ≤ 4 kV for explosion group III (gas and dust)
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.
9.1.15

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
● If dust or humidity have infiltrated the terminal box, this should be cleaned and dried
● Check the insulators, connectors and cable connections in the terminal box.
● Replace any damaged components.
132
– 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)
terminal connections.
(particularly the insulators).
Check all the seals and sealing surfaces and address the cause of the leakiness.
WARNING
Short-circuit hazard
Short-circuits can occur as a result of damaged components. This can result in death,
serious injury or material damage.
Replace damaged components.
SIMOTICS FD 1MQ1
Operating Instructions 01/2019