User's Manual

MODEL 2130 MARKER BEACON
Rev. A April, 2005 2-21
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purposes without written permission from SELEX Sistemi Integrati Inc.
U5:D. As long as the +15VIN1 level is above the trip point set by the voltage divider and the +3.3VREF from regulator U4,
the OR’d output of U5:B, U5:C, and U5:D will be pulled high through R83. This high output will simultaneously keep
On_Batt1 indicator CR29 off and transistor Q13 on. Transistor Q13 being on pulls the output of comparator U5:A low
through diode CR80, which in turn keeps battery switch transistors Q12, Q10:A, and Q10:B off.
In summary, if +15VIN1 remains above the “on battery” trip point, the On_Batt1 indicator and battery switch transistors
Q10:A and Q10:B are all off.
If +15VIN1 drops below the “on battery” trip point, the On_Batt1 indicator CR29 is lighted with current regulated by
resistor R47 and zener diode CR85. Transistors Q10:A and Q10:B will then be turned on (switching Batt1 into VSUM1)
until the Batt1 voltage drops below the “battery too low” trip point established by voltage divider R28 / R27 and
+3.3VREF on the inputs of comparator U5:A. Once Batt1 voltage falls below the “battery too low” trip point, the output of
comparator U5:A will go low and shut off transistors Q10:A and Q10:B; thus removing all power to the FFM1 and Marker
Beacon1. This is done to prevent complete discharge of a battery, which might cause permanent damage.
Regulator IC U4 creates +5VREF from the diode OR’d supply VALWAYS which is a combination of +15VIN1, +15VIN2,
Batt1, and Batt2 through diodes CR56, CR57, CR67, and CR68. As long as power is supplied in some way to the board,
VALWAYS and +5VREF exist. Another diode OR’d supply named VSUM1N2 is created by diodes CR25 and CR26 to
power the oscillator and reset circuitry of U6, U7, U8, and U10. As long as VSUM1 or VSUM2 are active, the battery fault
testing will continue.
Charging of Battery1 can be manually disabled by connecting jumper strap JP1A between JP1-1 and JP1-2. Disabling
BCPS1 in this manner shuts off charger U3 and prevents the lighting of on-board Batt1_Fault indicator CR27 and
On_Batt1 indicator CR29 through diodes CR44 and CR45 as well as off-board indicators On_Batt1 J1-1 and Batt1_Fault
J1-3 through diodes CR81 and CR46. Disabling BCPS1 will not allow lighting of On_Batt1 indicator CR29 and Batt1_Fault
indicator CR27 even during a lamp test (TEST* active low).
The TEST* signal from connector J1-14 is the means by which an external controller may light all indicators and stop
battery fault testing. TEST* is filtered by FL3 and transient protected by diode CR42. TEST* connects to the cathode side
of diodes CR51, CR52, CR53, and CR23. When TEST* is low, the On_Batt1 indicator CR29 is lit through CR51 assuming
the BCPS1 disable jumper at JP1 is not in place. Also, reset inverter U8:F is pulled low through diode CR52 causing U6:B
to turn on transistor Q5 and Batt1_Fault indicator CR27 (again assuming the BCPS1 disable jumper at JP1 is not in place).
While Test* is low, transistor Q21 will be turned on; lighting FFM2_DC indicator CR33 through diode CR62, lighting
MKR2_DC indicator CR32 through diode CR63, lighting FFM1_DC indicator CR22 through diode CR64, lighting
MKR1_DC indicator CR21 through diode CR65, lighting SYS1_AC indicator CR13 through diode CR66, and lighting
SYS2_AC indicator CR14 through diode CR24. Finally, current through diode CR90 will light Batt1_Fault indicator CR27
and On_Batt1 indicator CR29 in the event BCPS1 is not powered (again assuming the BCPS1 disable jumper at JP1 is not
in place).
Signal SHDN1* is the means by which an external controller may stop charging of the battery. SHDN1* enters via
connector J1-5, is filtered by inductor FL1 / capacitor C40, transient protected by diode CR41, and connects to charger U3.
A low level on the SHDN1* signal disables charger U3.