Merlin
Instruction manual V1.4
Pag:
9
ECU (Engine Control Unit) Set Up
The new ECU system of the XBL series is of modular design. All parameters concerning the
engine operation and run timers are stored in the engine and transferred to the ecu during power
up, enabling the replacement of the ecu without any adjustment, or, replacement of the engine
without readjusting the ecu, even with a different engine model. Check the table on page 5 to
check the minimum software version compatible with your engine model.
Parameters related to the installation, like radio setup, are stored in the ecu.
The ecu system supplied (ecu and engine) has been already tested and programmed at factory
for your engine. The engine has already been set up and tested using the same ECU and pump
supplied so there is very little to adjust in order to get the engine running, only the alignment to
your transmitter is necessary.
Confirm you have connected the ECU input to the throttle channel of your receiver,
DISCONNECT the ecu battery, and connect the Data Terminal into the ECU. Remove all rates,
mixes and throttle travel settings in the transmitter. Before doing any adjustment on the ecu,
check that your transmitter is sending the correct signal by checking the reading of “Pulse” in the
data terminal. It should be between 900-1050uS at STOP position, between 1100 and 1300uS at
IDLE position and between 1800 and 2200uS at Full Power position. Please note that these
readings on the ecu are measured directly from the signal received from your RC system, so you
should readjust your transmitter if the values read are outside that the ones suggested.
The setup assumes the use of a transmitter with manual trims.
If you use a TX with digital trims, is essential to use the switch in the TX programmed
for the function "Throttle cut", or “engine cut” which normally has the effect of
producing the “trim-down” function. Using a digital trim cause unstable idle, and
delay in shutting off the engine in emergency.
Check your radio manual for this before you start. Avoid using the digital trim if
possible.
Aligning transmitter with ecu
As the display does not photograph well we have reproduced the display readings as a green
box. Turn on the transmitter and receiver. The
opening screen should show as below:
Note there are four buttons on the display, two on
the left and two on the right hand side. The left buttons move to the different screens and the
right buttons are used to change the values stored.
Press the second, left button and scroll through the
menus until you find the one showing:
Press the (-) button and the display will show the “Radio” parameters menus. First screen shows
graphically the current adjust on the radio. Press the (^) button to enter in the menus to adjust
the radio.
Trim Low T=020ºC
RPM 00000
PW 000
Info
Run
Start Radio
RPM 00000
PW 000
Transmitter
yes
adjust
RPM 00000
PW 000
