Cosa 9610, Installation, Operation And Maintenance Manual

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INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
Page 16 of 48
The intrinsic safety inputs activate the auxiliary relays, energize the Rapid Exchange valve,
de-energize the enclosure contacts, and shut the system down, in addition to many more
actions and outputs.
Outputs
There are (2) normally open dry contacts for the enclosure power that can be energized only
after a successful purging and a minimum enclosure pressure is maintained. Loss of
pressure will cause the contacts to de-energize unless the shutdown timer is active or
bypass mode is implemented.
Also available are the Auxiliary 1 and Auxiliary 2, SPDT dry contact outputs. The auxiliary
outputs can be user configured using the user-interface controller and are controlled by
various inputs or various conditions such as low pressure, loss of pressure, bypass
implemented, Rapid Exchange valve on, enclosure above maximum pressure setting, and
many more. Both enclosure contacts and auxiliary contacts are forced-guided safety relays
for functional safety.
EPV-6000 I.S. Relief Vent
The EPV-6000 vent exhausts excess pressure from the enclosure if the pressure within the
enclosure is above 1.0” w.c. and measures flow and pressure during operation. The X-Purge
vent has a pressure transducer and thermal flow sensor that is connected to the 6000 EPCU
and is intrinsically safe through the galvanic isolation barrier within the EPCU. Because
measurement of the flow is always at the exhaust of the pressurized enclosure, the vent is
located on the enclosure(s) such that it is venting to the atmosphere. The vent is connected
to the I.S. termination board using theV1 connector and cable that comes with the vent. The
EPV-6000 vent can be mounted vertically or horizontally and is not gravity dependent. For
corrosive environments, the EPV-6000 has an optional stainless steel cap so that the body of
the vent is mounted in the enclosure with just the stainless steel cap exposed to the outside
environment.
The I.S. termination board is mounted inside the Type 4X (IP66) stainless steel enclosure
and does not require any lead seals to the EPCU enclosure. Wiring from the EPCU to this I.S.
termination board is provided. The power connection for enclosure power, auxiliary outputs
and power to the EPCU is completed within the explosion proof enclosure that houses the
EPCU. A stainless steel ¾” conduit extends to the outside of the Type 4X, IP66 stainless
steel enclosure for easy connection of the lead seals. Lead seals or Ex de cable glands are
not provided. Any certified lead seal or Ex de cable glands can be used. No special seals are
required. See X-purge manual for electrical connections.