
REV 1.6 © 2019 TCW Technologies, LLC.
Output Power connections:
The IBBS-12v-3ah 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. Maximum output current of 3.5 amps per
pin and 5 amps maximum continuous combined. The output wires of the IBBS system are
protected with a single 10 amp, mini ATC fuse. This fuse is accessible on the side of the
enclosure.
IMPORTANT NOTE ON CHANGING FUSE:
Disconnect the main product connector before changing the fuse!
Replace fuse with 10 amp, mini ATC fuse only
5. The Back-up Power Master switch must be utilized to turn the back-up battery system off
when not in use, except for installations where the off state current requirement is less than
50 micro-amps, such as with the AFS EFIS systems. Follow the specific wiring diagram for
this application. This back-up power master switch gives the pilot the ability to turn the back-
up battery system off. In some installations this may be the only means to shut down the
connected equipment.
6. The IBBS unit has a low voltage warning output, pin 3. This pin may be used to drive an
LED indicator or to provide a digital signal to indicate the main input bus is in a low voltage
condition. When the main input bus (connected to pin 5) falls below about 11 volts this
output will drive to a low state. Maximum current sourced on this pin is 25 milliamps.
7. The IBBS unit has in internal battery monitor connection, pin 2. This pin allows the
voltage state of the internal battery to be monitored with a separate voltage meter or analog
input. This pin will only report internal battery voltage when the unit is enabled by turning the
Back-up Master switch ON. A fully charged battery back will indicate about 13-14.7 volts on
this pin. . Important note: the meter utilized to measure pin 2 must have an input
impedance >100k ohms otherwise it will load down pin 2 and provide an artificially low
voltage reading.
8. Complete the installation of the wiring harness and connector prior to attaching the
connector to the IBBS product. This is essential to ensure the wires do not inadvertently
short together during installation. Remember, the IBBS pack is a back-up source of power
and is ready to deliver output power even when the aircraft electrical system is in the off
state.
9. When using the IBBS product to provide back-up power to an electronic ignition system it
MUST be used to back-up one and only one electronic ignition module. Do not use one
IBBS to back up both electronic ignition modules in a dual electronic ignition system. Follow
the wiring diagram for installation with electronic ignition module. Note, the Light Speed
Electronic ignition system connects directly to aircraft battery as shown. Other brands of
electronic ignition systems connect to the switch side of the aircraft master bus. Follow the
instructions per the electronic ignition manufacture for your installation.
10.When using the IBBS product to provide back-up power to an electronic ignition system
(CDI), pull-able circuit breakers must be used for over current protection as shown on page
19.