Spektrum SPM18000 DX18QQ User Manual download pdf (Page 59)

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Failsafe Functions

The AR12120 PowerSafe features two types of failsafe: SmartSafe

™

and Preset

Failsafe.

SmartSafe Failsafe

This type of failsafe is recommended for most types of giant-scale aircraft. Here’s

how SmartSafe works:

Receiver Power Only

When the receiver only is turned on (no transmitter signal is present), all servos

except for the throttle are driven to their preset failsafe positions, normally all

control surfaces at neutral and the landing gear down. These failsafe positions

are stored in the receiver during binding. At this time the throttle channel has no

output to avoid operating or arming an electronic speed control (if used). In glow-

powered models, the throttle servo receives no input, so it remains in its current

position. Some analog servos will coast (move when powered up) slightly even

though there is no signal present. This is normal.

The receivers remain in standby mode with the blue battery LEDs lit. When the

transmitter is turned on, the receiver locates the signal (GUID), connects and

normal control resumes. When connected, the amber LEDs on all attached remote

receivers will be on.

After Connection

When the transmitter and receiver are turned on after the receiver connects to

the transmitter, normal control of all channels occurs. If loss of signal occurs,

SmartSafe drives the throttle servo to its preset failsafe position (low throttle) that

was set during binding. All other channels hold their last position. When the signal

is regained, the system immediately regains control.

SmartSafe:

• Prevents unintentional electric motor response on start-up.

• Establishes low-throttle failsafe and maintains last-commanded control surface

position if the RF signal is lost. Failsafe positions are stored via the stick and

switch positions on the transmitter during binding.

Preset Failsafe

Preset Failsafe is ideal for sailplanes and is preferred by some modelers for their

glow- and gas-powered aircraft. Here’s how Preset Failsafe works.

Receiver Power Only

When the receiver only is turned on (no transmitter signal is present), all servos

except for the throttle are driven to their preset failsafe positions, normally all

control surfaces at neutral and the landing gear down. These failsafe positions

are stored in the receiver during binding. At this time the throttle channel has

no output to avoid operating or arming an electronic speed control (if used). In

glow-powered models, the throttle servo has no input, so it remains in its current

position. The receiver remains in standby mode with the blue battery LEDs lit.

When the transmitter is turned on, the receiver locates the signal (GUID), connects

and normal control resumes. When connected, the amber LEDs on all attached

remote receivers will be on.

After Connection

When the transmitter and receiver are turned on and the receiver connects

to the transmitter, normal control of all channels occur. If loss of signal occurs,

Preset Failsafe drives all servos to their preset failsafe positions. For sailplanes

it’s recommended that the spoilers/ﬂ aps deploy to dethermalize the aircraft,

preventing a ﬂ yaway. Some modelers prefer to use this failsafe system to program

a slight turn and low throttle to prevent their aircraft from ﬂ ying away. When the

signal is regained, the system immediately (less than 4 ms) regains control.

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Spektrum SPM18000 DX18QQ User Manual Page 59

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