Spektrum SPM18000 DX18QQ User Manual download pdf (Page 17)

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Power System Requirements

Inadequate power systems that do not provide the necessary minimum voltage to

the receiver during ﬂ ight are the number one cause of in-ﬂ ight 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 X-Plus 8 module has a minimum operational voltage of 3.5 volts; it is highly

recommended that the power system be tested per the guidelines below.

Recommended Power System Test Guidelines

If a questionable power system is being used (e.g., a small or old battery, an ESC

that may not have a BEC that will support high-current draw, etc.), perform the

following test with a voltmeter. The Hangar 9

Digital Servo & Rx Current Meter

(HAN172) or the Spektrum Flight Log (SPM9540) work well for this test.

Plug the voltmeter into an open channel port in the receiver and, with the system

on, 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.

CAUTION: When charging Ni-MH batteries, make sure the battery fully

charges. Ni-MH batteries charged with peak detection fast chargers have

a tendency to false peak (i.e. not fully charge), which could lead to a crash.

X+6 Servo

To SRXL Port

Auxiliary Battery Pack

(optional)

Jumper

On/Off Switch Harness (optional)

X+5 Servo

X+4 Servo X+3 Servo X+2 Servo X+1 Servo

X+8 Servo X+9 Servo

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Spektrum SPM18000 DX18QQ User Manual Page 17