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FR30HX Microprocessor Speed Controller
FR30HX Controller

The FR30HX is the first of a new range of microprocessor based speed controllers. The power of a microprocessor has enabled us to improve even on the market leading 43 series controllers and include many features not found on other controllers. The use of twin, ultra miniature 30 amp. rated automotive relays has allowed a genuine 30 amp. continuous rating.

The FR30HX also has a selectable operating mode, giving a choice of high, low or variable frequency. Operating at low frequency gives better starting and low speed control, whereas high frequency gives smoother and more efficient high speed performance. The unique Electronize variable frequency mode gives the best of both worlds. It's a best performance low frequency controller, a smooth mid-range controller and an efficient high frequency controller all at the same time.

As has come to be expected from all Electronize controllers, the FR30HX gives the very best speed control over the full range from idle to full speed. With this new design we have taken our high standard a step further. Firstly, the microprocessor digitally measures the input signal and totally rejects any out of limits signal produced by interference. Next the 'good' signals are used to calculate a rolling average for the transmitter signal. Slight interference causes the jitter that makes most controllers seem harsh. Using this digital technique, interference effects are reduced by a factor of 8 whilst maintaining a fast response time of only 160 milli-seconds.
With this speed controller there is no complicated set up sequence, as found on many microprocessor based units. The neutral position is pre-set with a precision within 0.5%. A simple screwdriver adjustment sets the speed range from 25 to 125%. You don't even need to check the motor direction because the controller is rated to run at full load in either direction and with no additional load on the receiver battery in reverse.
The electronic controller plugs directly into the 'throttle' output of the receiver with no need for a servo. There is no need to match the electronic control to the motor other than to stay within the maximum ratings. The same control will work equally well with a large or small motor.


Standard radio control servo signal input. (standard connector supplied)
Smooth P.W.M. forward and reverse speed control.
Selectable operating mode.
Low frequency mode: 100Hz
Variable frequency mode: 10 to 1000Hz
High frequency mode: 2000Hz
Low loss Power MOSFET current switching. (Only 2.7 milli-Ohms)
Low loss heavy duty cables. (0.25mm2)
High current automotive relays designed specifically for high power motor control.
Precision pre-set neutral.
Adjustable speed range to match throttle stick travel or scale speed.
6 to 24 volt motor battery operation. (5.5 volt min.)
30 amp. continuous load rating in either direction.
90 amp. short term stall rating. (continuous MOSFET rating)*
540 amp. peak rating.
*Beware suppliers who quote MOSFET rating as continuous controller rating!