p/n 725.0001 REV 1.5
© 2021 TCW Technologies, LLC.
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Product Details and General Information:
The Charging System:
The IBBS automatically maintains its internal battery pack. The internal charging circuit
monitors the state of the internal battery and recharges the battery as necessary when the
aircraft is operational. The input current for battery recharging is nominally 3.3 amps.
Battery charging only occurs when the aircraft supply bus connected to pin 5 is above 13.7
volts. (charging only occurs when the aircraft alternator is running and has available capacity)
If the internal battery is fully discharged for any reason it may require up to 90 minutes of
recharge time with the normal aircraft bus on. NOTE: Do not attempt to recharge the IBBS
product by using an external lead-acid type battery charger directly connected to the input of
the IBBS. Battery chargers typically provide pulsating voltages that may damage the IBBS
product if the system is not connected to a typical primary aircraft battery.
Recharge time at normal temperatures: 0C° to 40 C° 90 minutes nominal
Recharge time at low temperatures: -18C° to 0 C° n 15 minutes preheat
-40 C° to -18C° n 60 minutes preheat
Back-up Power Master Switch:
The IBBS has one input switch connection as identified in the wiring diagrams: Back-up
Power Master. This switch enables back-up power from the IBBS system to be available on
the output wires when power on the normal aircraft bus falls below 11 volts. Pin 1 is pulled
to ground when the back-up master switch is turned on, this enables the IBBS system.
If the back-up power master switch is enabled and normal aircraft power falls below 11 volts
then the internal back-up battery will be connected to the outputs and be utilized to supply
back-up power to the connected load.
If the normal aircraft power bus is above 11 volts, then the outputs are energized with normal
aircraft power (if the pass thru-power connections are utilized) and the back-up battery
remains off-line. The pass thru power feature does NOT depend on the state of the back-up
master switch. If power is made available on the pass-thru power inputs, it will pass through
and be available on the outputs. This allows for automatic pass through of power during
normal operation.
Ground Based Recharging:
To accomplish ground based charging, connect an approved battery charger or DC power
source (set to 14 volts) to the main aircraft battery and energize the main aircraft power bus
by turning on the master switch, leave all other aircraft loads in their off state. Note, the
ground base source of power must be capable to supply the load current of all devices that
can not be turned off in this nominal state, plus the 3.3 amps of IBBS recharge current.
Leave the ground-based charging system connected and powered until the IBBS system
completes its recharge cycle of its internal battery. See page 5 for details on battery
charging time. If voltage monitoring of pin 2 of the IBBS is available a peak charging voltage
of 14-15 volts will be observed as the battery reaches full capacity.
