Alpha Technologies PowerAgent SC3 - Manual (Page 9)

PowerAgent TM SC3 Site Controller Document # 700-000014-01 Rev 2
Installation and Operation
Phoenix Broadband Technologies, LLC 10/28/2010
Page 9 of 57
controller and each other, with no string-level voltages present in the interconnecting CAT5
cables. This architecture was designed to ensure safety and prevent damage. For environments
where string voltages are 64 VDC and lower Low Voltage sensors are appropriate, however
either sensor (High or Low voltage) can be used low voltage strings.
CAUTION: Installing Low Voltage sensors on a high voltage string will damage the
sensors and may present a shock hazard.
Both sensor types will be auto-discovered by the controller. The Low Voltage sensor has the
advantage that its position in the string is automatically discovered. This means the sensors can
be connected in any order and the controller will automatically discover upon which cell or jar the
sensor was installed. High Voltage sensors have an address. The address and cell or jar
number must be recorded when the sensor is installed. These addresses are then entered into
the Site Controller Web page so that the ordering of the cells or jars will be correct.
High Voltage and Low Voltage sensor should not be mixed in the same string.
Each sensor has a bi-color red/green LED that indicates the operational state of the sensor and
its communications status with the site controller. Each sensor is also is internally fused so that
improper connection to the jar will not damage the jar, the jar cabling, or the sensor. Again, the
sensors are fully optically isolated from the site controller.
2.1.2 Sensor Selector Guide
Selecting a sensor requires first determining if a Low or High voltage sensor is required. Then a
jar voltage is selected, either 2 or 12 volts. Finally the bracket style is selected. The sensor
model number is constructed as shown below.
Series B sensors should be used for all new installations, they offer improved noise immunity and
an enhanced feature set including battery balancing. These sensors require a B series
SiteController.
When selecting a bracket be sure to consider the clearance above the jar. This is particularly
important when the jars are installed in a cabinet as is typical with most UPSs. Be sure there is
enough space for the CAT-5 cables to exit the sensor without kinking.
PBT-PA-BS1-12-2
String Voltage
-BS1- Low Voltage (< 64 Volts)
-BS2- High Voltage (> 64 Volts)
-BS1B- Series B Low Voltage
-BS2B- Series B High Voltage
-BS3B- Series B Low Voltage, High Current
Jar Voltage
-2- 2 Volt Jars
-12- 12 Volt Jars
Bracket Type
-1 L Bracket
-2 Z Bracket
-3 Front Mount Bracket
-4 2 Wire Sensor
-5 12 mm Z Bracket