Spektrum SPMAR9110 User Manual

Page 17

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 after the receiver

connects to the transmitter and normal control of all channels occurs, if

loss of signal occurs Preset Failsafe drives all servos to their preset failsafe

positions. For sailplanes it’s recommended that the spoilers/flaps deploy to

de-thermalize the aircraft, preventing a flyaway. Some modelers prefer to

use this failsafe system to program a slight turn and low throttle to prevent

their aircraft from flying away. When the signal is regained, the system

immediately (less than 4 ms) regains control.
Preset Failsafe:
• Prevents unintentional electric motor response on start-up.

• Drives all servos, except for the throttle to their preset failsafe positions,

if the receiver only is powered and no signal is present.

• Establishes preset failsafe servo positions for all channels if the

signal is lost.

Programming SmartSafe
During the binding process, the bind plug is left in throughout the process

and is removed only after the receiver connects to the transmitter. After the

connection is made, confirmed by operating the servos, the bind plug can

be removed. The receiver is now programmed for SmartSafe.
Programming Preset Failsafe
During the binding process the bind plug is inserted in the bind port,

then the receiver is powered up. The LEDs in each receiver should blink,

indicating that the receiver is in bind mode. Now before binding the receiver

to the transmitter and with the receiver in bind mode, remove the bind plug.

The LEDs will continue to blink. With the control sticks and switches in the

desired failsafe positions, bind the transmitter to the receiver by putting

the transmitter into bind mode. The system should connect in less than

15 seconds. The receiver is now programmed for preset failsafe.

Note: Failsafe positions are stored via the stick and switch positions

on the transmitter during binding.