HFR15 High Frequency PWM Electronic Speed Controller

HFR15 - 15 amp forward and reverse speed controller

Thank you for buying an AsTec Product. 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:

Maximum Current 15 Amps,
Instantaneous Current 200 Amps,
Input Voltage 2v to 30v (6v-14v with BEC),
Low drop out BEC,
Bad signal rejection,
Shutdown on signal loss,
Reverse Indicator,
Auto/ manual setup,
Soft start/stop,
Super low speed response,
Low Loss, Silicon Power Cables,
Futaba type RC plug .

INFORMATION

The BEC circuit will maintain a 5 volt output with inputs as low as 5.5 volts, below this the 5 volt output will start to drop. The BEC can be de-selected by cutting the small gauge red wire loop. An on/off switch may be fitted in this loop to power to the unit and radio on and off, keep the wires as short as possible to prevent interference. The loop must be cut if a receiver battery is being used, or if the input battery is less than 6v or more than 14v.. The BEC is able to support a maximum of 1 speed control 1 receiver and 2 servos. More servos can be accommodated if a larger heatsink is fitted or they are low use - e.g. in a submarine.

With the motor battery connected and the receiver power turned off (e.g. BEC loop cut and no receiver pack) the motor will not run, however when not in use the main battery must be disconnected as a small current will otherwise flow, this will discharge your battery and could lead to damage! The speed controller will stop the motor if the receiver signal is lost. Odd signals (too short or too long) will be rejected.

It is essential that the motor be adequately suppressed. Poor suppression is characterised by twitchy servos with the motor running reacting in odd ways.

SETTING 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 GENTLY pressing small metal tab or raising the plastic tab and pulling the lead(s) 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, trim to a close shape with a knife and finish by using the knife blade as a scraper. Battery and Motor connectors are left to your preference, use the best you can afford, we do not recommend the use of chocolate blocks as they have a habit of working loose and overheating! Use a fuse to protect against over current. Normally a 10 amp fuse will suffice, these do not blow until the current reaches about 15amps.

Connections are:
Red - battery +ve
Black - battery -ve
Yellow - Motor.

Simple set up

Load default settings and activate. Turn your transmitter on and set the speed control stick to it's normal off position. Turn the receiver and speed controller on. The LED on the speed controller will light for about 2 seconds, When the LED goes out the second time the speed controller has set itself up.

Custom Set up

Turn your transmitter on and set the speed control stick to it's normal off position. Turn the receiver and speed controller on. The LED on the speed controller will light for about 2 seconds, When the LED goes out the speed controller has read and recorded the null (off) position (this can be anywhere on the stick travel) . Move your transmitter stick to the required maximum speed setting. After about 1 second the LED will light again for 1 second, and extinguish. The speed controller has then read and recorded the maximum setting. Returning the stick to the null (off) position will activate the speed controller. Pushing the stick backwards/forwards will now cause the motor to operate.

General set up notes

The speed controller may not function in the direction of original movement of the transmitter stick, if this happens operate the servo reverse for the speed control channel on the transmitter and repeat the setup. The setup sequence will run whenever you turn your speed controller on. This ensures that it is always matched to the transmitter being used and that it will always reach full speed. If custom setup is used then it must be done each time the unit is switched on.

Electronics and water do not mix, getting the unit wet can cause serious malfunction.

NB DO NOT SHORT THE FET TO THE BEC they are both mounted on the heat-sink but are individually insulated from each other. DOING THIS WILL CAUSE SERIOUS DAMAGE AND PERHAPS A FIRE! The heat-sink may get warm but should never be too hot to touch, if it is , something is wrong! STOP NOW AND CHECK.

Motor suppression: Use at least a 0.47uf 50volt capacitor (474) across the motor(s). A special kit is available.