8910-PS-DC System power supply

DC system power supply
The 8910-PS-DC DC input power supply
provides a regulated 12 V @ 4.9 A output
from a DC input voltage range of 18.5 up to
36V. This input voltage range
accommodates the typical 24 V DC supplies
available on process plants worldwide.
This power supply is designed to mount
directly on 8711-CA-NS or 8712-CA-NS
node services carriers or on a 8717-CA-PS
power supply carrier. On the node services
carriers mentioned here, two positions are
provided. This enables a second power
supply to be mounted, under conditions
where the user wants to provide additional
power, or where a redundant power supply
is required to provide maximum system
availability.
DC IS module supply
Power Supply module 8920-PS-DC mounts
on its own carrier (8724-CA-PS) and accepts
a locally available 24 V dc
(nominal) supply and converts it to 12 V dc
for powering MTL8000 I/O modules that
have intrinsically safe field wiring.
Its 5 A output is capable of powering
between six and twenty I/O modules,
depending on the module types and their
mix.
A number of 8920-PS-DC modules may be
used together, within an MTL8000 node, in
a load-sharing arrangement. Where power
supply redundancy is required an
additional supply module may be added in
an “n+1” arrangement. Failure of any
power supply is signalled to the Bus Interface
Module.