Spektrum SPMAR9200 - Manual (Page 19)

Spektrum AR9200 19
EN
QuickConnect ™ with Brownout Detection
The AR9200 Evolution features QuickConnect with Brownout Detection.
Should a power interruption occur (brownout), the system will reconnect
immediately when power is restored and the LEDs on each connected
receiver will flash indicating a brownout (power interruption) has occurred.
Brownouts can be caused by an inadequate power supply (weak battery or
regulator), a loose connector, a bad switch, an inadequate BEC when using
an electronic speed controller, etc. Brownouts occur when the receiver
voltage drops below 3.2 volts thus interrupting control as the servos and
receiver require a minimum of 3.2 volts to operate.
How Brownout Detection Works
When the receiver voltage drops below 3.2 volts the system drops out
(ceases to operate). When power is restored, the receivers will immediately
attempt to reconnect to the last two frequencies they were connected to.
If the two frequencies are present (the transmitter was left on) the system
reconnects, typically about 4ms. The receivers will then blink indicating
a brownout has occurred. If at any time the receiver is turned off then
back on and the transmitter is not turned off, the receivers will blink as a
power interruption was induced by turning off the power to the receiver.
In fact this simple test (turning the receiver off then on) will allow you to
determine if your system’s brownout detection is functioning.
Note: If a brownout occurs in-flight it is vital that the cause of the brownout be
determined and corrected. QuickConnect and Brownout Detection are designed to
allow you to safely fly through most short duration power interruptions. However, the
root cause of these interruptions must be corrected before the next flight to prevent
catastrophic safety issues.
The AR9200 PowerSafe Evolution features a minimum voltage memory that can be
used to evaluate your aircraft and the battery packs. The minimum voltage memory
shows you the extent to which the battery voltage dropped during the last flight due to
the control surfaces jamming, the model has stiff linkages, or it has batteries that fade
under load. It is a good idea to make it part of your routine to check the minimum
voltage memory after every flight, this allows you to find problems with the model
or batteries before the next flight. To check the minimum voltage, after a flight, press
both SensorSwitch battery 1 and 2 buttons. The 3 battery LED’s will indicate the
lowest voltage level that occurred during the flight. The minimum voltage memory
does not record short duration voltage drop outs, only those voltage drops which last
longer than one second.