5.3 REMOTE RESOURCES
When L90 is ordered with a process card module as a part of HardFiber system, then an additional Remote Resources
menu tree is available in EnerVista UR Setup software to allow configuring HardFiber system.
The remote resources settings configure a L90 with a process bus module to work with devices called Bricks. Remote
resources configuration is only available through the EnerVista UR Setup software, and is not available through the L90
front panel. A Brick provides eight AC measurements, along with contact inputs, DC analog inputs, and contact outputs, to
be the remote interface to field equipment such as circuit breakers and transformers. The L90 with a process bus module
has access to all of the capabilities of up to eight Bricks. Remote resources settings configure the point-to-point connection
between specific fiber optic ports on the L90 process card and specific Brick. The relay is then configured to measure spe-
cific currents, voltages and contact inputs from those Bricks, and to control specific outputs.
The configuration process for remote resources is straightforward and consists of the following steps.
Configure the field units. This establishes the point-to-point connection between a specific port on the relay process
bus module, and a specific digital core on a specific Brick. This is a necessary first step in configuring a process bus
Configure the AC banks. This sets the primary and secondary quantities and connections for currents and voltages.
AC bank configuration also provides a provision for redundant measurements for currents and voltages, a powerful
reliability improvement possible with process bus.
Configure signal sources. This functionality of the L90 has not changed other than the requirement to use currents and
voltages established by AC bank configuration under the remote resources menu.
Configure field contact inputs, field contact outputs, RTDs, and transducers as required for the application's functional-
ity. These inputs and outputs are the physical interface to circuit breakers, transformers, and other equipment. They
replace the traditional contact inputs and outputs located at the relay to virtually eliminate copper wiring.
Configure shared inputs and outputs as required for the application's functionality. Shared inputs and outputs are dis-
tinct binary channels that provide high-speed protection quality signaling between relays through a Brick.
For additional information on how to configure a relay with a process bus module, please refer to GE publication number
GEK-113500: HardFiber System Instruction Manual.
Figure 5–12: REMOTE RESOURCES CONFIGURATION MENU
L90 Line Current Differential System
5.3.1 REMOTE RESOURCES CONFIGURATION