Foxboro PSS41H-2G62 G62and G72Tricon System and Termination Enclosures

Field Termination Assemblies

Termination Assemblies (TAs) are installed on the DIN rails mounted at the sides of

the FBM baseplates. The Universal I/O modules are connected to the TAs with pre

installed system cables.

The TAs are supplied with redundant 24 V DC, protected by fuses that are monitored

by the Fuse Monitoring Unit (FMU).

The enclosure is shipped with TAs fitted with passive feed-through signal conditioners

which you can replace with the signal conditioners listed in the section Termination

Assemblies and Signal Conditioners, page 8.

Power Distribution Architecture

The enclosure provides a redundant 24 V power system using two FPS480-24 power

supplies fed by independent sources. Power wiring is routed through the bottom of the

enclosure. The input power connects to the primary and secondary entry terminal

blocks for main and backup power.

Electrical fuses are monitored by the Fuse Monitoring Unit (FMU) and an open fuse

indication from the FMU is wired into the Enclosure Monitoring Unit (EMU) through the

Alarm Distribution Assembly.

Grounding

All enclosure structural elements are integrally grounded by the enclosure design to

meet the appropriate industry regulations and standards. The enclosure is equipped

with two instrument earth bars. It also has a protective connection point at the outside

bottom of the enclosure for customer grounding purposes. Field wiring shields can be

terminated either to the Terminal Assemblies or to the instrument ground bus bar.

Spare signal wires and shields can be terminated either to the Terminal Assemblies or

to the instrument ground bus bar.

The G61enclosure is available as a vented or sealed enclosure. It can be configured

with:

• Uptosevenvertical DIN rails for mounting of Triconex termination devices and

additional customer-supplied terminal blocks for marshalling

• Redundantpowersupplies (480 W or 960 W 24 VDCpower supplies) for field

power

The G61vented enclosure is a free-standing, floor mounted unit with an IP43/55

rating for location in mild (ordinary) environmental areas.

The G61sealed enclosure is a free-standing, floor mounted unit, with options for

either an IP55 or IP66 rating for location in harsh environments.

Sealed enclosures with an IP66 rating provide a higher level of protection from

airborne contamination.

NOTE: In regions that require EMC compliance, you must order the EMC

compliance option if the Triconex termination devices for Tricon modules SMM or

SRXMwill be installed in this enclosure. Without these termination devices, the

enclosure already fulfills the requirements for EMC compliance.

An optional door intrusion monitoring switch is available for each door on this

enclosure. Each switch is prewired to a set of alarm status terminal blocks.

The G61enclosure can be installed bayed or adjoined to other Triconex enclosures to

maximize the use of floor space and ease of cabling. The enclosures can be bayed

together using third-party kits.

This enclosure and its configurations have been tested and qualified by Foxboro for

use with the Tricon equipment.