MHF Forwards Only PWM Electronic Speed Control

MICRO-HF Series 2 Forwards Only Electronic Speed Controller (not the 20)

Thank you for buying an AsTec Speed Controller. With a little care it will give you hours of good service and enjoyment. To ensure its reliability we have used nothing but the best parts available.

Specification:

BEC 800 milli amps maximum Up To 14 cells ( ESC, Radio Receiver and one standard servo), selectable— on BEC units full isolation can be achieved by cutting both red and black loops (6-14 units only) . Available in 3 versions, 6-14 cells with BEC, 6-14 cells isolated, 10-30 cells Isolated (9 models)
Frequency approx 5 khz.

SETTING UP:

A 1 pole on/off switch may be fitted in the red wire, a 2 pole switch can be used to fully isolate the unit. Keep wires as short as possible. CARE—use of over 14 volts with the BEC enabled will blow the unit up. The unit is supplied with a FUTABA type plug. Before plugging the unit in check that the wires are in the correct positions for your receiver. If they are not remove them by carefully depressing the small tab and pulling the lead free. Re-insert the lead in the required position and check that the retaining tab is fully seated. The plug can be carefully trimmed to fit your receiver by filing the plastic tab away. Battery and Motor connectors are left to your preference, Use the best you can afford!

Connections are: Red - Batt +ve and Mot +ve, Yellow - Mot -ve, Black - Batt -ve

The Arming Sequence:

Every time the ESC is turned on it goes through an arming sequence, it will not work until this has been completed.

1. Turn the transmitter on and move the speed stick to the centre position. Connect the speed controller up to the receiver and apply power to the ESC and receiver (at this stage a receiver battery is best but if you have a BEC capable ESC you may use a motor battery but it is not necessary to connect a motor). The indicator on the ESC will light for approximately 1 second., and extinguish for 1 second. This sequence is repeated once more. At this point the ESC is armed.

2. Push the stick forwards. If the indicator lights gradually as the stick is pushed forwards go to step 4

3. The indicator did not light with forward movement of the stick indicating that the transmitter stick operation needs reversing using the servo reverse switch. Turn the transmitter and receiver off, alter the switch and return to step 1.

4. The ESC is now setting up properly. Connect the motor and redo the sequence with the transmitter stick in your preferred off position. The motor will now beep when the LED is lit during the arming sequence, you will then be able to tell if the arming sequence is working without seeing the LED.

Set up can be used for full (bottom to top) or half (centre to top) stick movement on most transmitters. The ESC will usually auto detect which mode to use. When indicator extinguishes for the second time unit will arm only if the transmitter stick is in the null band. The indicator will remain lit until the unit is armed (but the motor will only beep for 1 second).

NB.It is essential that the motor is well suppressed. Use the suppression kit supplied.

We recommend that you use a safety loop connector in the motor battery positive lead that can be disconnected from outside the model. This can be used to switch the radio on/off when the BEC facility is used.