Section 14: Communications
Communication Adapter Modules (CAM)
The NRX breakers are equipped to handle a flexible and
modular system of CAM modules. These modules provide
communication from the trip unit to a field bus network. Various
networks are supported and available:
• ICAM—INCOM IL01301033E
• MCAM—Modbus IL01301034E
• PCAM—PROFIBUS IL01301035E
• ECAM—ETHERNET IL01301052E
These modules, for the draw-out type circuit breaker, will snap
onto the DIN rail of the cassette. They are designed to install
or replace the four contact blocks (eight contacts in total) at
secondary contacts 19 through 26.
When the CAM module is installed and powered with 24 Vdc,
the trip unit will be able to communicate with the CAM module
via contacts CMM1 (23), CMM2 (24), CMM3 (25), and CMM4
(26). For communication to the desired field bus a connector
on the top of this CAM module provides the required network
connections. For more information refer to the comm module
instruction leaflets listed above.
Figure 23. CAM Module
Operating Manual for Series NRX
Digitrip Trip Units 1150 / 1150i
Effective September 2013
Instructional Leaflet IL01301064E
Each CAM module has two jumpers on the front of the module
for configuration as shown in
Figure 23
. One of the jumpers
recovers the Source Ground Jumper on the terminal blocks
when a CAM module is used. A circuit breaker that uses
Source Ground Fault Sensing or Zero Sequence Sensing for
ground fault protection will have a jumper on the terminal
blocks between connectors SGFI (20) and SGF2 (19). Should a
CAM module be mounted on the terminal blocks of a draw-out
type circuit breaker, the ability to provide the jumper selection
to enable or disable Source Ground Fault configuration is
recovered by the jumper on the front of the CAM module.
Each of the CAM modules provide two normally open (a) relay
contacts, one to provide remote communications opening
and one to provide remote communications close operations.
Wiring diagrams are included in the communications module
instruction literature or can be found in the technical document
TD01301014E (Series NRX NF and RF Wiring Diagrams).
The circuit breaker must be equipped with a shunt trip for
opening commands and a spring release accessory for
closing commands. If the remote control opening and closing
operations are not desired the shunt trip or spring release
accessories need not be installed or wired in through the two
CAM relay contacts. If the remote control operations are
desired and the shunt trip or spring release are installed and
wired, then there is a jumper on the front of each CAM module
that will enable or disable the remote communication control
capability. It may be desirable to put this jumper in the disable
position when maintenance work or testing is being done on
the circuit breaker.
A high speed peer to peer message structure is supported
by all of the CAM modules to interface with the trip unit. As
soon as data or status has changed or an event has occurred
the information will be pushed up from the trip unit to the
CAM module. Conversely, if a request or data is received by
the CAM module from the field bus, that information will be
immediately transferred to the trip unit.
Power requirements: 6 watts at 24 Vdc Each CAM module
will provide the isolation required for the 24 Vdc power supply
source to the trip unit and the communications interface.
37
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Jumper Plug
Enable for
Source
Ground
Sensing
Jumper Plug
Enable for
Communica-
tion Control
