Fieldbus Surge Protector
Product Specifications
20
22
-0
6
11
The following table gives an overview about types and their specific usage in combinations
with Fuchs fieldbus components:
2.1.1
Cable Shield Grounding Options
Fieldbus supports several methods for cable shield grounding in order to accommodate
differing plant references (see FOUNDATION Fieldbus
“
System Engineering Guideline
”
AG-181). The most common of the topologies uses a single point for grounding,
where the cable shield is connected directly to a clean earth at the control room, whilst all other
screens or shields throughout the segment are left open or floating.
Other topologies connect the cable shield at multiple points throughout the segment to earth
in order to maximize protection against EMC disturbance.
Surge Protector type *-LBF-IA1.36.IE.* connects the shield indirectly through a gas discharge
tube to earth, whilst type *-LBF-IA1.36.DE.* connects the shield directly to earth.
2.1.2
Surge Protector Diagnostics
Surge Protectors types *-LBF-IA1.36.*.1 contain a unique diagnostic function that predicts
failures of Surge Protectors, before they adversely affect fieldbus communication
or the segment voltages.
The Surge Protector diagnostics monitors, measures, and records any overvoltage event,
then compares the events to a given algorithm to predict how many further overvoltage events
can be tolerated, before the surge protection electronics fails or degrades to a point where
it affects the fieldbus communication.
Type
Description
Shield connection Predictive
diagnosis
Hazardous area
TCP-LBF-
IA1.36.IE.0
Surge Protector for
trunk connections of
R2-SP*, R3-SP*
fieldbus couplers
Indirectly grounded
through GDT
No diagnostics
Entity, FISCO,
DART
TCP-LBF-
IA1.36.IE.1
Surge Protector for
trunk connections of
R2-SP* fieldbus
couplers
Indirectly grounded
through GDT
Includes diagnostics Entity, FISCO
TPH-LBF-
IA1.36.DE.0
Surge Protector for
trunk connections of
MBHD-FB1-* and
MBHC-FB-* Power
Hubs
Directly grounded
No diagnostics
Entity, FISCO,
DART
TPH-LBF-
IA1.36.DE.1
Surge Protector for
trunk connections of
MBHD-FB* (except
type MBHD-FB-D*)
and MBHC-FB*
Power Hubs
Directly grounded
Includes diagnostics Entity, FISCO
SCP-LBF-
IA1.36.IE.0
Surge Protector for
spur connections of
R2-SP*, R3-SP*,
R4D0-FB* fieldbus
couplers
Indirectly grounded
through GDT
No diagnostics
Entity, FISCO
SCP-LBF-
IA1.36.IE.1
Surge Protector for
spur connections of
R2-SP*, R4D0-FB*
fieldbus couplers
Indirectly grounded
through GDT
Includes diagnostics Entity, FISCO
