Effective 7/1/2003
Page 24
I.L. 70C1037H04
4.9.3 INCOM Network Interconnections
INCOM sends bursts of data on a 92 to 115.2 kHz carrier
at a 9600 baud rate over twisted pair conductors to
interconnect the many devices comprising the network.
The Digitrip 520MC will light the red LED shown in Figure
1.1 when transmitting on INCOM.
Recommended cable specifications:
•
Cutler-Hammer Inc. cable catalog #IMPCABLE,
Style #2A95705G01
•
Belden 9463 cable family
•
Identical Commscope or Quabbin cables
These bursts of data can be captured and used in a variety
of ways depending upon the manner in which the master
computer software program is written. For example, all the
settings can be viewed via the master computer. Another
example is that the data for the individual phase current
values are available on the network, but the software must
select the appropriate data, decode it and display it in a
useful manner. Following an over-current trip operation, the
sequence of coded data varies slightly. The cause of trip,
the value, the phase (or ground) current responsible for the
trip are available on the network.
Figure 4.9 INCOM Network with Remote Master Computer or BIM
1
1
2
3
Notes:
Refer to Master Circuit Breaker Connection Diagrams in Appendix C.
Modular telephone connector, Type RJ11, supplied by user.
Ground shielding at computer and BIM as shown. Where devices
are daisy-chained, interconnect shielding, but do not ground the connection.
100 ohm 1/2 watt carbon terminating resistor required at last breaker. See T.D. 17-513.
See Section 4.9 for programming INCOM function.
0 0 1
0 0 2
Cut-off Shield or connect to
unused customer
terminal -- Do not Ground.
Twisted Pair.
No. 18 AWG.
Breaker
Interface
Monitor
(BIM)
C-H Coni. Card
Typical Magnum
Circuit Breaker
with Digitrip 520MC
Trip Unit
3 Digit INCOM Address
as displayed on Tripunit
H = 9600 Baud
See View A
Typical IBM
Compatible
Computer
View A
(Y)
(BL)
3
3
2
