Low Battery Warning function is only for your reference. The actual battery level could be different.
Battery Memory Effects such as Lazy Battery Effect or Battery Memory could affect the Low Battery
Warning function.
- When the 2.4GHz system and HV servos are used together, we strongly recommend using
fully-charged, large capacity battery packs and you must constantly monitor the battery status.
Warning
If FAIL-SAFE is deactivated, the FAIL-SAFE position settings are also deleted!
The FAIL-SAFE settings should be checked every time before you run the engine/motor.
The way to bind with Optima SL can be different for each Transmitters. Please refer to the description about binding with
Receivers on the manual of each Transmitters.
FAIL-SAFE and Hold Mode Setup
Telemetry System
I. Basic Function: Low Onboard Battery Warning
When the Optima SL is powered up, it will automatically detect the battery voltage level and recognize between 4-cell or
5-cell NiMH and NiCd batteries (4 cell < 5.8V < 5 cell).
In case a 2-cell LiPo battery is being used, you can customize the battery warning level by using the HPP-22 PC program.
- When the battery level is safe (4 cell > 4.5V, 5 cell > 5.6V), there will be no change to the LED lights.
- When the battery level is low (4 cell < 4.5V, 5 cell < 5.6V), the BLUE LED glows constantly and the RED LED will blink fast.
You will hear three continuous beeps from the module as a low receiver battery warning. Upon hearing the beeps, we
advise you to land at once.
If the receiver signal somehow becomes interrupted or interference occurs, the servos will move to the pre-set FAIL-SAFE
point you previously stored in the FAIL-SAFE set-up. Make sure you set the FAIL-SAFE function properly.
If FAIL-SAFE has not been activated, the signal will switch off after the HOLD period of one second.
This means that the servos become “soft” and remain in their last commanded position under no load (this may equate to
full-throttle!), until a valid signal is picked up again.
In the interest of safety, we recommend that the FAIL-SAFE function should always be activated, and the FAIL-SAFE settings
should be selected so as to bring the model to a non-critical situation (e.g. motor idle /electric motor OFF, control surfaces
neutral, airbrakes extended, aero-tow release open, etc.).
The Hitec AFHSS 2.4Ghz system and Optima SL feature full telemetry capabilities and include a Low Receiver Battery
Warning as a basic function.
Fail safe mode.
a. Switch on transmitter and receiver.
Wait for the system to boot and gain control over the model.
b. Press and hold the button on the receiver until the LED turns off (approx. 6 seconds)
c. Release the button. After 2 seconds, both RED and BLUE LEDs blink alternately.
The receiver will count 5 seconds, during that time, move all the transmitter sticks and other controls to the desired
FAIL-SAFE positions (e.g. motor idle, control surfaces neutral). Hold until blinking stops.
d. When blinking stops, the system will temporarily remember the FAIL-SAFE position. Turn off the system to save and exit.
II. Optional Functions:
GPS, Airspeed, Variometer, Servo Manager, FUEL, TEMP, O-RPM, M-RPM, VOLT, Amp Sensors - Applicable for
Optima SL
- More devices will be available in the future.
Check the Hitec website at www.hitecrcd.com for more up-to-date information.
3 Axis Gyro
SER
VO
SER
VO
SER
VO
SER
VO
S-BUS
Throttle Servo/ESC and Power supply
Receiver
Battery
AILE
ELEV
PITCH
RUDD
How to turn FAIL-SAFE Off and reactivate the Hold Mode
a. Switch on the transmitter then the receiver. Wait for the system to boot and you have control over the model.
b. Press and hold the receiver function button for 6 seconds and release. After 2 seconds, the RED and BLUE LEDs will blink
rapidly.
c. Immediately press the button once.
d. FAIL-SAFE Mode is now deactivated and HOLD mode is activated.
e. Turn the transmitter off then the receiver off.
f. Turn the system back on to use it.
Please select ‘S-Bus’ on Gyro software when SL slot is connecting to 3 axis gyro.
When you use OPTIMA SL with other brand’s devices, some of functions of devices may not
operate perfectly. Please check fully functions before the flight.
Single Line Connection Diagrams
Link (ID-Setup or Bind)
Testing the FAIL-SAFE Setting
a. Move the sticks to positions other than the FAIL-SAFE settings and then switch off the transmitter.
The servos should now move to the FAIL-SAFE positions previously stored, after the one second HOLD period.
