CK721-A Network Controller
Hardware Installation
24-10025-237 Rev. –
7
Chain Module Wiring
When connecting more than one module, wire the modules in parallel following the “daisy
chain” pattern. Only the S300-DIN-L enclosure provides enough space for multiple modules
and chain module wiring.
Cable Routing
The cables should run in grounded conduit or at least two feet from AC power, fluorescent
lights, or other high energy sources.
I
MPORTANT
:
All data cables should be physically separated from power lines. If conduit is used, do not
run data cables in the same conduit as power cables or certain door strike cables, e.g. strike voltage
greater that 42V or Magnetic door locks without EMI suppression.
Every unit in a Johnson Controls installation must have its chassis bonded to a verified electrical
ground (earth). In all cases, the local wiring codes apply.
The National Electrical Code NFPA 70 must be followed for installations in the USA.
The Canadian Electric Code, C22.1 must be followed for installations in Canada.
BSI Standard BS7671 (latest edition) must be followed for installations in Great Britain.
Additional information is given in the Cardkey Installers’ Code of Practice.
Conduit ground, cold water pipes, unbrazed joints, or dissimilar metals are unacceptable in the
path of either building or supplement ground. Where grounding is required, connect only to the
proven building electrical system ground (earth).
Chassis Grounding
Proper grounding of the S300-DIN-L enclosure is essential for the protection of electronic
components against electrostatic discharge. A ground wire, 18 AWG minimum, must be run
from the dedicated ground stud inside the enclosure to the building’s electrical ground. The
dedicated ground stud is marked with the symbol
.
N
OTE
:
Cold water pipe is not an acceptable ground due to common use of non-conductive plastic pipe.
+24 VDC Connector
The CK721-A is provided with a pre-wired power connector. Depending on how the CK721-A
is installed you may or may not need to use this connector.
Figure 5: +24 VDC Connector (Part of the DC Power Harness)
Power Wiring
For power wiring in the small enclosure, use the cable assembly provided with the small
enclosure. Do not use the pre-wired power connector provided with the CK721-A.
COM
+24 VDC
COM
HOT
