We are delighted that you have chosen one of our range of electronic speed controllers (ESC) for model air-
craft. Please read right through these operating instructions before attempting to use the controller for the
first time.
Specification, 18 A controller: Specification, 30 A controller:
Type: BL-Control 18 A Type: BL-Control 30 A
Continuous current: 18 A Continuous current: 30 A
Peak current: 22 A (< 10 sec.) Peak current: 40 A (< 10 sec.)
BEC mode: Linear BEC mode: Linear
BEC output: 5 V / 2 A BEC output: 5 V / 2 A
LiPo cell count: 2 - 3 LiPo cell count: 2 - 4
Low-voltage protection: yes Low-voltage protection: yes
Weight: 19 g Weight: 25 g
Dimensions: 40 x 26 x 10 mm Dimensions: 45 x 26 x 11 mm
BEC servo count 2S LiPo 3S LiPo 4S LiPo
Standard micro-servos 543
If you prefer to use a separate receiver battery instead of the BEC sy-
stem, you will need to withdraw the red wire from the connector housing
and insulate the bare contact to avoid a short-circuit.
Using your new speed controller for the first time
Please keep to this sequence when using the controller for the first time:
1. Pull the throttle stick right back to its “Idle” end-stop, then switch the transmitter on.
2. Connect the flight battery to the speed controller; the unit now initiates a self-test; the special beep se-
quence “* 123” sounds. This means that the voltage of the battery is in the normal range. After this you will
hear N beeps, indicating the number of cells in the Lithium battery. Next comes a long beep which means
that the self-test has been completed satisfactorily: the model aircraft is clear to fly.
3. VERY IMPORTANT: since the throttle signal range of different transmitters varies, we strongly recommend
that you start by using the “throttle range set-up function” in order to calibrate the throttle range. Please read
the appropriate paragraph in these instructions entitled “Setting the full-throttle and stop positions”.
Warning beeps
1. Input voltage not normal: as soon as the battery is connected, the controller checks the battery voltage. If
the voltage is not within the permissible range, the unit emits the following sequence of warning beeps:
“beep-beep, beep-beep, beep-beep”, with a pause of around one second between the pairs of beeps.
2. Throttle signal abnormal: if the throttle signal picked up by the controller is not in the normal range, the unit
emits the following sequence of warning beeps: “beep-beep-beep”, with a pause of around two seconds
between the sets of beeps.
3. Throttle stick not in the “fully back” position: if the throttle stick is not at the idle end-point, the unit emits a
very rapid sequence of beeps: “beep-beep-beep”, with a pause of only about a quarter of a second bet-
ween the sets of beeps.
Protective functions
1. Start-up protection: if the motor does not start within two seconds of the throttle command, the speed con-
troller switches the output voltage off. If this should happen, you MUST pull the throttle stick right back, ot-
herwise you will not be able to start the motor. The reason for the failure to start may be any of the following:
the connection between speed controller and motor is intermittent; the propeller or motor is blocked (pre-
vented from turning); the gearbox is damaged, etc.
2. Overheating protection: if the temperature of the controller rises above 110°C, the unit reduces the output
voltage.
3. Throttle signal failure protection: if the throttle signal is not present for a period of one second, the control-
ler reduces the output voltage. If it fails again for a period of two seconds, the controller switches the out-
put voltage off completely.
Fault-finding
Fault Possible cause Solution
The motor does not start Connection between battery Check power connections,
when switched on; no beeps and controller defective replace plug / socket
When switched on, the motor Input voltage too high or Check battery voltage
does not start; warning beep too low
sequence “beep-beep, beep-
beep, beep-beep” emitted
(pause between double-beep
lasts around one second)
When switched on, the motor Invalid throttle signal Check receiver and / or
does not start; warning beep transmitter
sequence “beep-beep-beep” Check throttle channel
emitted (pause between triple lead
beeps lasts around two
seconds)
When switched on, the motor Throttle stick not at Move throttle stick
does not start; warning beep idle end-point to “fully back” position
sequence “beep-beep-beep”
emitted (pause between triple
beeps lasts around a quarter
of a second)
When switched on, the motor Throttle channel is reversed Reverse throttle channel
does not start; special beep
sequence “* 56712” is emitted
after two beeps (beep, beep)
The motor spins in the wrong Connection between speed Swap over any two wires
direction controller and motor incorrect between controller and
motor
BL-Control 18 / 30 A
Operating Instructions
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