Spektrum SPMAR12120 - Manual (Page 13)

EN
13
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 and after the receiver connects to
the transmitter and 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. Note: 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.