Lcn Network Grounding - Honeywell LC13-510 Manual

2.8 LCN NETWORK GROUNDING

If the LCN coaxial cable bus segment does not have Clock Source/Repeater (CS/R) boards
attached (an all-K2LCN segment), a grounding wire must be installed on one, and only
one, CLCNA board and on one, and only one, CLCNB board. This grounds the shield of
the A coaxial cable and the shield of the B coaxial cable at one point each to logic ground.
Honeywell recommends that Cable A and Cable B not be grounded in the same module.
This guards against loss of both LCN paths if the module is replaced. Figure 2-9 and
Figure 2-10 shows these ground connections in separate modules.
If a coaxial cable segment has CS/R boards, the grounding of the cable sheaths is done at
the CS/Rs and must not be duplicated at the CLCNA, CLCNB, or elsewhere.
LCN Coax Cable "A"
Upper Node
I/O Cage
Lower Node
Figure 2-9 — Ground Wire Installation on KLCNA for Coax Cable A Ground
Dual Node Module Service
Logic Ground to Chassis Ground Jumper
I/O Cage
CLCNA
AC
Power
Power Connector
I/O Cage
CLCNB
2-20
Cable "A" Gnd
Logic Gnd
AC
Power
LCN Coax Cable "B"
2.8
Chassis Gnd
Logic Gnd
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