Table of Contents
Advertisement
4.8
Final Checks
Before replacing the lids on the enclosure, check:
•
that all cable glands and any blanking plugs are tightened securely.
•
that all cable glands are tightened to provide the required IP seal in accordance
with gland installation instructions.
•
that the protective trunk wiring cover is in place on the Trunk Terminal Assembly.
•
that no tools (e.g. screwdrivers) or loose items have been left in the enclosure.
•
that there is no damage to any cover seal, otherwise it must be replaced with one
that has the same manufacturer's part number.
•
that if, and only if, the enclosure is the last one on the fieldbus segment, that a
9378-FT Terminator module is fitted into the socket on the TTA.
•
that the required grounding link is securely connected between the enclosure lid
and the enclosure body.
Fit the enclosure lid and tighten all of its securing screws to a recommended torque
of 2.5 Nm.
5
MAINTENANCE
When the enclosure is installed in a hazardous area it is important for personnel to
understand what activities are permissible when fieldbus power is present and what are
not.
5.1
General
The following items in the enclosure may be removed or disconnected while the
trunk is still powered.
•
9377-FB-R Fieldbus Barrier module(s)*
•
9378-FT Terminator module
•
9376-SP Trunk Surge module
•
9379-ALM Alarm module
•
FS32 Spur Surge modules and any spur wiring
All other wiring in the enclosure requires the trunk power to be isolated, or a gas
clearance certificate to be obtained before any work is carried out.
The standard, non-redundant 9377-FB barrier cannot be fitted in place of the
9377-FB-R; it has built-in mechanical differences to prevent its substitution.
5.2
Fieldbus Barrier maintenance procedures
The 9377-FB Fieldbus Barrier is designed to tolerate the failure of one or more
spur circuits in either Fieldbus Barrier module. However, a failed module should
be replaced as quickly as possible to avoid any loss of power or communication
to the spurs from subsequent failures. If a barrier module has one or more LED
indicators showing solid red, meaning that the internal spur circuits have failed (see
"Troubleshooting"), then it should be replaced.
INM 9370-RD Rev 5
Read and understand what work is permitted inside the enclosure.
Failure to comply with these instructions can endanger the lives
or health of personnel and risk damage to the plant and the
environment.
* NOTE
WARNING!
15
Advertisement
Table of Contents
