Alpha Technologies PowerAgent SC3 - Manual (Page 16)

PowerAgent TM SC3 Site Controller Document # 700-000014-01 Rev 2
Installation and Operation
Phoenix Broadband Technologies, LLC 10/28/2010
Page 16 of 57
4 Sensor Installation
Refer to the Battery Management System Manual (700-000006-02) for detailed information
before installing the battery sensors.
CAUTION! Lethal voltages may be present on the battery strings. If you are not sure of
what you are doing leave the installation to a certified technician. Read the sensor
installation instructions carefully.
CAUTION! Be sure to disconnect the Rectifier or Charger before installing the Sensors.
Failure to do so could result in sensor damage.
5 Site Controller Installation
NOTE: Before any sensor strings are connected to the Site Controller, it should be
mounted (either in a rack or shelf), connections should be made to the network (Ethernet
connection) and it should be powered up and checked out for network connectivity.
Select a location for the Site Controller. The location should be central to the strings being
monitored. It should be dry and free of corrosive or explosive vapors.
The maximum cable length between the SC3 Site Controller and the battery string varies with the
number of battery sensors on the string. With 40 sensors a maximum total cable length of 200
feet is recommended. This includes the sensor to sensor cables. With 24 sensors this increases
to 300 feet.
Mount the Site Controller in an equipment rack using the optional rack mount bracket, or place
the Site Controller on a shelf.
5.1 Powering
Connect a source of 18 to 65 volts DC to the rear panel power connector. This can be DC power
from a DC power plant or it can be 24 VDC from the optional WT-3 plug-in transformer. For UPS
installations the Site Controller should be powered from the WT-3 or other DC source. The WT-3
should be plugged into a outlet that is running on the UPS. Never power the Site Controller from
UPS batteries. The SC3 Site Controller can also be powered from low voltage AC. Consult PBT
for the voltage range limitations. There is a power input fuse inside the Site Controller. It is
extremely rare for this fuse to blow.
The power supply input is floating on the SC3 Site Controller. To ground the Site Controller
connect the center ground pin on the power connector to an earth ground.