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Instruction manual JetCat-PRO engines, 1.7 - V12.01V
Setting the failsafe
The following procedures are for most radios like JR, Futaba, or Airtronics/Sanwa
→
If you look at the following servo travel graph below, you can see how the ECU detects a failsafe condition. The gray
bar is the transmitters throttle channel end points set for +/- 100% travel. This is the travel range when setting the
transmitter’s failsafe. The white bar is a reduced end point travel set for +/- 50% travel. This is the value that will be
taught into the ECU. If the throttle input to the ECU is between 50% for low throttle, low throttle trim and 50% for high
throttle, then this would be within the ECU’s taught range and will operate normally. If a failsafe condition exists, the
transmitter’s pre-programmed 100% low throttle, low throttle trim will be outputted by the receiver and this value
would be outside of the ECU’s taught in range. The ECU will now automatically set the engine to idle (after a default
0.1 second
Failsafe delay
) and start a programmable timer. The timer is set to 2 seconds by default. If the timer times
out, the ECU will shut-off the engine. If at any time during this countdown the receivers signal is reacquired, the ECU
timer will be reset and the engine will go back to the speed the throttle stick is currently at.
Setting the travel range to +/- 50% does not affect the RPM range of the engine.
Low Throttle
High
Throttle
FOR TWO CHANNEL OPERATION:
Do not enable the auxiliary channel in your transmitter for failsafe. Keep it in
hold
mode
only. The auxiliary channel is always designed to stop the engine instantly if commanded to do so.
For spread spectrum radios, there are two different ways to set the failsafe. It is either accomplished by the
transmitter’s failsafe menu or by binding the receiver to the transmitter. Refer to your transmitter’s manual on how to
set the failsafe.
To set the failsafe, you must execute the following steps. It is
VITAL
that these steps be performed in this order for the
failsafe feature to operate properly.
YOU MUST PERFORM THESE STEPS!
Inspect the transmitter programming to ensure that dual rates and exponential functions are disabled and sub
trim is set at zero for both throttle and, if two channel operation, the auxiliary channel. Some transmitters
have a travel limit menu in addition to travel end points menu. If so, set the limits to its maximum amount >=
100%
Set your transmitters end point travel parameter to +/- 100% for low and high throttle.
If you are using two channel operation, position the auxiliary channel to the center position.
Set your transmitters throttle stick to low throttle and low throttle trim. Depending on the radio system
you are using, either set the throttle channel for failsafe and store/memorize this minimum position or
bind your receiver to the transmitter.
Return to the travel end point menu and now set the low and high throttle end point to +/- 50%.
Now you must teach in these values into the ECU. Refer to
Learn R/C
section next in this manual.
Additional Failsafe menus are explained in the manual’s advanced section.
If you change your transmitter’s failsafe after these steps are completed, you must redo the
following instructions again
.
Before setting failsafe, set throttle travel at 100% low / 100% high throttle
Teach ECU at 50% low / 50% high
throttle
Set Failsafe
Failsafe area
Failsafe area
