Johnson Controls CK721-A User Manual

CK721-A Installation and Operation CK721-A and S300-DIN Enclosures
24-10349-8 Rev. B 2-13
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
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
.
NOTE
Cold water pipe is not an acceptable ground due to common use of
non-conductive plastic pipe.
SMALL ENCLOSURE (S300-DIN-S)
The S300-DIN-S enclosure comes with a backplate, a tamper switch, a lock, and a ground
strap kit that have to be installed. The backplate contains a power supply and a DIN rail for
mounting of one CK721-A or a S300-DIN module (RDR8S, I32O16, RDR2S-A, or
RDR2S). The enclosure can also hold a backup battery unit composed of two 12V lead-acid
batteries in one battery bracket.
Figure 2-9: Small Enclosure With Installed Components
Figure 2-9 gives you an overview of the small enclosure
with all components installed. The
module shown here is RDR2S.

Johnson Controls CK721-A Specifications

General

Brand	Johnson Controls
Model	CK721-A
Category	Controller
Language	English