TMT84 Wiring
Endress+Hauser 19
• Installation and maintenance are significantly easier.
• Existing cable infrastructures can be used and expanded instantly, e.g. when constructing new
star distributors using 4-channel or 8-channel distribution modules.
Therefore, the device is optionally available with a fitted fieldbus connector ex works. Fieldbus
connectors for subsequent fitting can be ordered from Endress+Hauser as a spare part (see chapter
8 'Accessories').
Shielding the feed line/T-Box
Cable connections with good EMC properties must be used, preferably with wraparound cable
shielding (iris spring). This requires low potential differences, possibly potential equalization.
• The PA cable shielding must not be disconnected.
• The connection of the shielding must be kept as short as possible at all times.
Ideally, cable connections with iris springs should be used for connecting the shielding. The shield
is fitted on the T-box housing using the iris spring which is inside the connection. The shielding
meshwork is under the iris spring. When the Pg is screwed down, the iris spring is squeezed onto
the shield and thus creates a conductive connection between the shielding and the metal housing.
A terminal box or connection is to be seen as part of the shielding (Faraday cage). This is particularly
true for separate boxes if they are connected to a PROFIBUS
®
PA device with a plug-in cable. In
this case, a metallic connector must be used whereby the cable shielding is fitted at the connector
housing (e.g. pre-terminated cable).
a0009941
Fig. 9: Connectors for connection to the PROFIBUS
®
PA fieldbus
Pin assignment / color codes
D Plug 7/8": D Plug M12:
A Fieldbus connector 1 Brown wire: PA+ (terminal 1) 1 Grey wire: shield
B Field housing 2 Green-yellow wire: ground 2 Brown wire: PA+ (terminal 1)
C Connector at the housing
(male)
3 Blue wire: PA- (terminal 2) 3 Blue wire: PA- (terminal 2)
4 Grey wire: shield 4 Green-yellow wire: ground
5 Positioning tappet 5 Positioning tappet
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