S300 Expansion Enclosures CK721-A Installation and Operation
3-16 24-10349-8 Rev. B
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
Equipment Grounding
Proper grounding of the S300 expansion enclosures are 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 S300 expansion
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.
POWER
This section describes the transformer and power supply, and provides tables on S3000
enclosure power consumption. Several considerations and cautions that must be considered
before powering the enclosure are also detailed.
S300-XFMR Transformer
The plug-in transformer converts the 120 VAC line power to 24 AC for the power
supply. The transformer is rated at 24 VAC, 50 VA. A transformer is required for
each expansion enclosure to connect the power supply to local power.
NOTE
For Canadian installations use a Basler transformer. The part number is
BE116450AAA, and it is rated at 24 VAC, 50 VA, 120 Volt input.
Use a 3-conductor #18 AWG cable between the power supply connector and the
transformer. Connect the transformer to the nearest source of clean, unswitched AC
power. At the power supply, connect AC power as follows:
 PIN 1 and 2 on J1 connects to 24 VAC.
 PIN 3 on J1 is to chassis ground.
Table 3-2: S300 Expansion Enclosur
e AC Power Specifications
Parameter Specification
Line Voltage 24 VAC  10
%
Line Frequency 50 or 60 Hz 1%
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