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Manual Number 9019286 • Revision E, January 06, 2022
Discrete Communication Signals
Discrete signals are available to provide both basic battery status and simplified indication of
battery readiness specific to the aircraft’s requirements. In some cases, where serial data
cannot be integrated with the aircraft’s avionics or other messaging systems, the discrete
battery status signals can be used to meet minimum regulatory annunciation requirements for
lithium batteries.
Each discrete output is normally open and provides an active low/ground when the condition
is true as described below. The circuit consists of a MOSFET connected to the battery
negative (ground) with a series resistance of 60Ω. Each pin is current limited to 50mA.
Table 4.2
Discrete Output Definitions
There are two discrete inputs as described below. Both are normally open and are required
to be grounded to activate their function.
Battery Disable: This input, when grounded, manually and fully disables the battery,
including power and communication.
Heater Disable: This input, when grounded, manually disables the heaters from
operating.
Discrete Communication Signals
Heating
Active when the Heater is providing heat.
Fault
Active when the battery has an internal fault. Internal faults may be
temporary and may result in partial or fully degraded functionality.
Faults may clear with time or upon next usage. Verify battery health
and availability by cross-checking other parameters (voltage, state of
charge, etc.).
Service
Active when the battery has a permanent fault. Service faults may
result in partial or fully degraded function. Verify battery health and
availability by cross-checking other parameters (voltage, capacity,
state of charge, etc.). Battery should be submitted for service in
accordance with the aircraft’s flight manual supplement.
Min Capacity
Active when the battery has determined that its state of charge is
BELOW the value programmed according to the aircraft’s
customizable configuration parameters.
Engine Start
Active when the battery has determined that its available energy is
NOT sufficient to fully complete an engine start. The requirements to
complete an engine start must be programmed according to the
aircraft’s customizable configuration parameters.
Summary of Contents for True Blue Power TB20 Series
Page 1: ...Revision E January 6 2022...
