GE 8910-PS-DC

Description

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.
AC power supplies
The 8913-PS-AC and 8914-PS-AC supplies
produce DC output power from a wide
range of AC inputs. Both can be mounted in
a Zone 2 or Division2 hazardous area
which means that they can be used for a
broad range of applications including
supplying power to 8000 series modules.
System and Field power
The 8913-PS-AC is a dual output supply
capable of producing 12 V and 24 V DC
outputs of approximately 5 A.
For 8000 series products, the 12 V output
can be used to supply system power to the
node and also provide 24 V to power field
devices via the field power bussing facilities
on the 8000 series carriers.
Field power
The 8914-PS-AC has a single 24 V DC
output with a 10 A capacity. This is ideal for
powering a wide range of field devices.
With 8000 series products, it is normally
distributed via the field power bus (see

A load sharing diode is built in to the 12V
output of the 8913-PS-AC power supply and
the 24V output of the 8914-PS-AC. This
enables one or more of the same power
supply type to be connected in parallel to
share the load requirements.
Power health signalling
The 8913-PS-AC and the 8914-PS-AC
supplies provide power health signals that
can be routed to the BIM to warn of possible
imminent power failure.
The 8913 provides the power health signal
from its 12 V DC output.
Bussed field power
(2/2 modules/carriers only)
In addition to the system power supply, an
MTL8000 node may need to be supplied
with additional field power.
Conventional systems require field power
supplies to be wired in at the field terminals
or via additional patching connectors. This
adds complication to the field wiring and
can be a source of confusion during
maintenance work.
The MTL8000 system overcomes this
complication with a system for bussing
power on the carriers. Each carrier can bus
an external power supply to modules so that
they can energise the field wiring.
In the case of the 4-20mA Analog Input and
Output modules, the bussed field power is
also used to energise the field interface
circuits.
The connection for the bussed field power is
located at the top of the carrier and uses a
two-part removable connector. Individual
bussed field power supplies connect to two
modules. If an adjacent pair of modules
require the same power supply voltage the
connector can be wire-linked to provide it,
otherwise a different supply voltage (AC or
DC) can be connected.