Spektrum SPMAR7200BX - Manual (Page 19)

EN
19
AR7200BX power System Requirements
All flybarless gyro systems require uninterrupted power.
During even a short duration power interruption/brownout, the flybarless unit
must reboot and reinitialize.
CAUTIoN: If a power interruption/brownout occurs during flight, a crash
will occur. It is your responsibility to ensure the AR7200BX has sufficient
power without interruption.
Some of the power system components that affect the ability to properly deliver
adequate power include:
• The switch harness, battery leads, servo leads, regulators etc.
• Receiver battery pack (number of cells, capacity, cell type, state of charge)
• The ESC’s BEC capability to deliver current to the receiver when load is
placed on the servos. This is the #1 cause of power interruptions in electric
helicopters.
The AR7200BX has a minimum operational voltage of 3.5 volts; it is highly
recommended the power system be tested per the following guidelines.
Recommended power System Test Guidelines
Perform the following test with a voltmeter. The Spektrum Flight Log or Telemetry
Modules (TM1000/TM1100) work well for this test.
Plug the Flight Log into an open channel port in the receiver and, with the
system on, load the servos by applying pressure to the swashplate with your
hand for 3 minutes. Monitor the voltage at the receiver. It is important to load
the swashplate for 3 minutes. If a voltage regulator becomes hot, it can lose it’s
ability to supply current. An alternate method is to power on the system and
rapidly move the control sticks (stir the sticks) with no load on the servos for 3
minutes. The voltage should remain above 4.8 volts in both cases.