Receiver Power System Requirements - Spektrum PowerSafe SPMAR9140T User Manual

Receiver Power System Requirements

Inadequate power systems that are unable to provide the necessary minimum
voltage to the receiver during flight have become the number one cause of
in-flight failures. Some of the power system components that affect the ability
to properly deliver adequate power include:
• Receiver battery pack (number of cells, capacity, cell type, state of
charge)
• The ESC's capability to deliver current to the receiver in electric aircraft
• The switch harness, battery leads, servo leads, regulators, etc.
The AR9140T/AR12310T/AR20310T have a minimum operational voltage
of 3.5 volts; it is highly recommended the power system be tested per the
guidelines below.
Power System Test Guidelines
If a questionable power system is being used (e.g. small or old battery,
ESC that may not have a BEC that will support high-current draw, etc.), it is
recommended that a voltmeter be used to perform the following tests.
The Hangar 9 Digital Servo & receiver Current Meter (HAN172) or the
®
Spektrum Flight Log (SPM9540) is the perfect tool to perform the test below.
Plug the voltmeter into an open channel port in the receiver and with the
system on, or simply monitor the voltage on a telemetry capable transmitter,
load the control surfaces (apply pressure with your hand) while monitoring the
voltage at the receiver. The voltage should remain above 4.8 volts even when
all servos are heavily loaded.
How QuickConnect
• When the receiver voltage drops below 3.5 volts, the system ceases to
operate.
• When power is restored, the receiver immediately attempts to reconnect.
• If the transmitter is left on, the system typically reconnects in about
4/100 of a second.
NOTICE: If a brownout occurs in flight it is vital that the cause of the
brownout be determined and corrected.
NOTICE: When using Y-harness or servo extensions with Spektrum
equipment, always use standard, non-amplified Y-harnesses and servo
extensions. Using amplified Y-harnesses or servo extensions may cause
servos to operate erratically or not function at all.
Techonlogy Works
™
17
EN