Securitron BPSS-20 - Manual (Page 3)

PN# 500-22125
Page 3 Rev. D, 08/11
Notes:
 The controller is shipped with a jumper installed. This sets the controller for charging
SEALED batteries. If a FLOODED battery is being used, simply remove the jumper to
optimize the battery charging for a flooded battery. If the jumper is connected again, the
charging will return to the set-points for a sealed battery.
 For safety and the most effective lightning protection, the negative conductor of the PV
system should be properly grounded. The controller connects the PV-negative, Battery
negative and Load- negative internally per UL recommendations. No switching is done in
the negative current path.
4.2.4 Operating Characteristics
4.2.4.1 Polarity Protection
The controller is generally protected from reversed connections, but the system operator and
other equipment will be at risk when polarities (+ and –) are reversed. Carefully check before
making each connection to ensure that the polarity is correct.
4.2.4.2 LED Indicators
Green LED:
The green LED indicator located on the power controller is lit whenever sunlight is available for
battery charging. The green LED will turn off at night. Because the controller uses a PWM
constant voltage charging process, there is usually some amount of energy going into the
battery at all times. Although the charging current falls to very low levels when the battery
reaches full charge, the green LED will continue to stay ON (during the daytime). This is to
indicate that the controller is working and that energy is available from the PV array for
charging.
Red LED:
The controller includes an automatic load disconnect (LVD) feature along with a red LED
indicator. Whenever the battery charge state falls below the LVD set-point, the load will be
disconnected and the red LED will light. This indicates that the controller has disconnected the
load to protect the battery from further discharge and possible damage. After some period of
recharging the battery, such that it recovers to approximately 40 to 50 percent of its rated
capacity, the load will automatically be reconnected and the red LED will turn off.
4.2.4.3 Controller Features and Functions
Low Voltage Disconnect (LVD):
If the battery falls below 11.5 volts, the load is disconnected from the battery to protect against
harmful deep discharges. A 2-second delay prevents load disconnects from transients. The load
is automatically reconnected when the battery voltage recovers to 12.6 volts.
Battery Disconnect:
If the battery is disconnected during the daytime, the PV array will continue to provide power to
the controller. The controller will immediately go into PWM and provide power at a constant
voltage to the load. This may continue as long as power is available from the PV array.
Auxiliary Generators:
Engine generators and other sources of power may be connected directly to the battery for
charging. It is not necessary to disconnect the controller from the battery. However, do not use
the controller to regulate these other generators.
Reverse Current:
The controller prevents the battery from discharging through the PV array at night. There is no
need to install a blocking diode for this purpose.
Noise:
The controller circuit minimizes switching noise and filters all noise output to extremely low
levels when the system is properly grounded. If noise is present in a telecom load, it is most
likely due to a grounding problem in the system.