INM 937x-FB2-Px-SS Rev 1
14
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.
WARNING !
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.
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)
• 9376-SP Trunk Surge 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.
5 .2 Fieldbus Barrier - fitting and removal
CAUTION!
THESE ENCLOSURES ARE SUPPLIED WITH FIELDBUS BARRIER
MODULE TYPE 9377-FB-R
IT IS NOT POSSIBLE TO FIT THE EARLIER BARRIER TYPE (MODEL 9377-FB) INTO
THESE ENCLOSURES.
The individual 9377-FB-R Redundant Fieldbus Barrier module(s) may be fitted or
removed without isolating the trunk power. The trunk connections to the barrier
module on the carrier have spark suppression by design and cannot cause ignition
while they are being connected or disconnected.
Figure 5 .1
– Fieldbus Barrier module – fitting & removal
