Pe Connection; Unearthed Operation; Din Rails - Emerson PACSystems RSTi-EP User Manual

User Manual
GFK-2958J
surface area with low impedance, whereby a uniform reference potential is ensured for all
control unit elements.
Required measures:
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PE Connection

The connection from earth to the PE (protective earth) connection must be done centrally.
WARNING
In the event of a fault, the earth must never take on a dangerous contact voltage, which is
why it must be connected to a PE conductor.

Unearthed Operation

In the event of unearthed operation, the corresponding safety regulations must be
observed.

DIN Rails

Notes concerning the use of DIN rails:
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Earthing and shielding
Removal of the insulating layer around screw connections. Protection of connection
points against corrosion
Connection of moving earthed components (cabinet doors, separated mounting
plates, etc.) through short earthing straps with large surfaces
Where possible, avoid use of aluminum parts, because aluminum oxidizes easily and
is therefore unsuited for earthing
Large-surface, low-impedance attachment on the mounting plate and
corresponding contact with the carrier system using screws or rivets
Proper earthing
Use corrosion-proof DIN rails
Remove the insulating layer on painted, anodized or insulated metal components in
the area around the connection point
Protect the connection point against corrosion (e.g. using grease; Attention: only
use grease suitable for the purpose)
Chapter 7
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