22
Instruction Leaflet
I. L. 29-888B
Effective July 2011
Instructions for Digitrip RMS 810 Trip Unit
eaton corporation
www.eaton.com
5 communications
One of the most important functions of the Digitrip RMS 810
Trip Unit is its ability to communicate both information and con-
trol signals via the Eaton proprietary INtegrated COMmunications
(INCOM
®
) Local Area Network (LAN) . INCOM
®
interconnects
microprocessor based (and other) electrical distribution and control
products, with personal computers into a comprehensive information
and control communications network (see Section 5 .5) . The Digitrip
RMS 810 Trip Unit already has INCOM
®
capability for external com-
munications built into its microprocessor chip (see Figures 2, 21, 22,
23, and the specific wiring diagrams for your circuit breaker listed in
Section 6) . The receiving terminal(s) can be:
•
An Assemblies Electronic Monitor (AEM) or Breaker Interface
Module (BIM) for local or remote monitoring (see Figure 22 and
references in Section 6) .
•
A remote master personal computer (PC) - IBM
®
compatible (see
Figure 21 and references in Section 6) .
•
Both an AEM or BIM (for local monitoring) and a PC for remote
monitoring and control (see Figure 23 and references in
Section 6) .
5.1 Trip Unit Address and Baud Rate
To enable the INCOM
®
communications system to identify each cir-
cuit breaker individually, the Digitrip RMS 810 Trip Unit has a unique
3-digit "ADDRESS", which INCOM
®
uses to identify the Trip Unit and
the circuit breaker it controls .
NOTICE
NEW DIGITRIP MODEL 810 TRIP UNITS, AND TRIP UNITS PROVIDED AS A
PART OF NEW CIRCUIT BREAKERS, WILL ALREADY CONTAIN A FACTORY-
SET BAUD RATE AND ADDRESS, WHICH IN GENERAL WILL NOT APPLY
TO YOUR NETWORK. FOR PROPER COMMUNICATIONS, EACH TRIP UNIT
ADDRESS AND BAUD RATE MUST BE SET TO THE VALUES APPLICABLE
FOR YOUR NETWORK. SIMILARLY, PRIOR TO THE INSTALLATION OF A
TRIP UNIT INTO ITS CIRCUIT BREAKER, OR PRIOR TO INSTALLATION OF
A CIRCUIT BREAKER INTO ITS COMPARTMENT (AFTER MAINTENANCE
FOR EXAMPLE), THE USER SHOULD VERIFY THAT THE BAUD RATE AND
ADDRESS ARE CORRECT. FAILURE TO USE THE CORRECT BAUD RATE
OR ADDRESS CAN CONFUSE THE COMMUNICATIONS SYSTEM. IT IS
RECOMMENDED THAT THE APPROPRIATE BAUD RATE, ADDRESS, AND
CIRCUIT BREAKER CELL LOCATION OR BUS OR CIRCUIT REFERENCE BE
RECORDED IN THE SPACES PROVIDED ON THE TRIP UNIT DISPLAY PANEL,
FOR FUTURE REFERENCE (SEE FIGURE 1).
The User can view the present address and assign a new 3-digit
address by the following procedure .
otee:
N
The breaker need not be open and may be carrying current .
1 . Press-and-continue-to-hold-in the "TRIP RESET" push-button (see
Figures 1 and 20) .
2 . Watch the display window, and after about 5 seconds the param-
eter value will disappear, and either the letter "H" or "L" (baud rate
code), followed by the 3-Digit address (between "001" and "999",
there is no "000") will appear . (You do need to continue to hold-in
the "TRIP RESET" push button .)
3 . To increment the address, press and release the (Black)
"DEMAND RESET push button near the display window (see
Figure 1) . The address will increase by one unit each time you
press the (Black) "DEMAND RESET push button . If you press-
and-hold the (Black) "DEMAND RESET" push button, the address
will increase continuously, slowly at first, and then faster as you
continue to hold the button in . (You do need to continue-to-hold-
in the "TRIP RESET" push-button while you do this .)
4 . To decrement the address, press and release the (Black) "STEP"
push button (see Figure 1) . The address will decrease by one
unit each time you press the (Black) "STEP" push button . If you
press-and-hold the (Black) "STEP" push button, the address will
decrease continuously, slowly at first, and then faster as you con-
tinue to hold the button in . (You do need to continue to hold-in
the "TRIP RESET" push button while you do this .)
5 . The letter "H" refers to the High 9600 Baud rate; and the letter "L"
refers to the Low 1200 Baud Rate . An " X in the Baud Rate field
indicates that neither "H"igh nor "L”ow Baud Rate has been select-
ed . Press and release the (Black) "TEST" push button to change
the baud rate . (You do need to continue-to hold-in the "TRIP
RESET" push button .) Suggestion: Before you press and release
the (Black) "TEST" push button, set the "TEST AMPS" switch to "1
", to minimize the effect of an "unintended test", which can occur,
if your other finger would happen to come off the "TRIP RESET
push button .
otee:
N
For correct communications, be sure to use the terminating resistor at
the end of the twisted pair (last element in the INCOM
®
chain) (see Figures
21, 22, and 23, and refer to the IMPACC
®
Wiring Specification listed in
Section 6) .
6 . When the address and baud rate code in the display window are
correct, release the "TRIP RESET" push button to save the values
into the Trip Unit's non-volatile memory, and the kA, MW or MWh
value will return to the display window . If control power is lost,
the Trip Unit will still know its (new) address and baud rate .
otee:
N
If control power is lost while you are changing the address or baud rate,
i .e .: while you are still holding-in the "TRIP RESET" push button, the display
will go blank and when the control power is restored, the Trip Unit will still
retain the previous address and baud rate values, as if you had not been trying
to change them .
NOTICE
AS SHOWN IN FIGURE 1, TO THE LEFT AND BELOW THE DISPLAY WINDOW,
IS A SPACE TO RECORD THE INCOM
®
ADDRESS. BECAUSE TRIP UNITS
AND CIRCUIT BREAKERS OF THE SAME RATING ARE INTERCHANGEABLE,
IF MORE THAN ONE HAS BEEN WITHDRAWN FOR MAINTENANCE AT ONE
TIME, IT IS CRITICAL THAT THE EACH UNIT BE RETURNED TO ITS CORRECT
CELL LOCATION SO THAT THE CIRCUIT HAS THE CORRECT ADDRESS.
FOR EXAMPLE, IF TWO IDENTICAL BREAKERS (ONE WHOSE TRIP UNIT
ADDRESS IS "001" AND THE OTHER WHOSE TRIP UNIT ADDRESS IS
"100") WERE SWITCHED, THE INCOM
®
COMMUNICATIONS SYSTEM WILL
RESPOND PER THE INFORMATION FROM EACH TRIP UNIT'S ADDRESS
NUMBER AND NOT THE NEW CELL POSITION.
5.2 Remote Master Computer
To communicate with a remote master (IBM
®
compatible) personal
computer, install a Eaton Computer Operated Network Interface
(CONI) card or Master INCOM Network Translator (MINT) into the
computer frame (chassis) . The connections in the network are then
made by twisted pairs of wires as shown in Figure 21 .
