p/n 725.0002 REV 3.0
© 2023 TCW Technologies, LLC.
5
Utilize the base plate of the IBBS system to match drill mounting holes to the
aircraft structure. See page 17 for mounting dimensions.
Fasten the IBBS unit to the aircraft structure utilizing 4 pcs of AN3 bolts or AN515R
machine screws and mating lock nuts or nut plates.
Connect up to 48 inches of 3/8
”
I.D. vent hose to the vent port on the IBBS unit and
secure with hose clamp. Vent hose and hose clamp are provided with the IBBS
unit. The vent hose may be shortened. Do not extend beyond 48
”
. Secure hose
every 12
”
with MS21919-WH10 adel clamps (not provided). Do not kink hose,
minimum bend radius for the vent hose is 2
”
. Route the end of the hose to the
bottom or side exterior of the aircraft.
4.
Connect the aircraft wiring according to one of the wiring diagrams shown.
The IBBS must be powered from properly sized circuit breakers or fuses. Ensure
the proper size wire is utilized for the input feed, output supply and ground
connection.
Power Requirements
:
The IBBS has multiple power inputs
.
Pin 5
receives power for charging the internal battery and bus voltage sensing for the
switching logic within the IBBS unit. Pin 5 must be connected to an aircraft power bus.
When the voltage on pin 5 falls below 11 volts the system automatically transfers the load
current on the output pins to the internal back-up battery source. Pin 5 nominal current
draw is 3.3 amps during charging.
Pin 4
provides power to an internal battery heater system utilized when the battery
temperature is below 0 C°. The nominal current draw is 1.4 amps when the battery
temperature is below 0 C°.
Pins 6,7,8
provide power that is passed-thru the IBBS unit to the loads connected to the
output pins. These pass-thru power connections are optional and only required for
systems that do not have multiple power inputs. These pins can also be used if it is
desired to have redundant power paths feeding the connected loads. These pins are
internally wired in parallel; it is recommended to populate all three pins; join the wires
together and feed all of these inputs from the pass-thru power breaker. Note: these pins
do not individually correspond to any particular output pin (12-15). The pass-thru breaker
must be sized for the load that is connected to the IBBS outputs. The maximum
combined load is 8 amps continuous, 12 amps peak for <30 seconds. If Pins 6,7,8 are
used they must be connected to the same source of power as Pin 5.
Output Power connections
:
The IBBS has four output pins, Pins 12,13,14,15. These pins provide power to the
connected load. These four wires may be paralleled together for redundancy and load
current sharing. Use 20 awg wire for each pin. The total combined load for all four pins
is 5 amps continuous,10 amps peak.
