5. HIGH SPEED SETTING
To adjust the high speed setting, again disconnect the motor wires. With the motor
disconnected, give the throttle on the transmitter full throttle position. You should see a green
indicator light on the SP-520 controller. If not, use the tuning wand to adjust the “FULL
POWER” potentiometer until the light comes “ON” when full power is commanded from the
transmitter. To take full advantage of the power band of the SP-520, adjust the full power setting
so that the green light will come only when the very last bit of throttle is added to the transmitter.
This will give you a broad mid-range power band which allows far better control of the car. You
may now reconnect the motor to the car.
6. REVERSE
To use the reverse function of the SP-520 PLUS, simply move the throttle stick or trigger on
your transmitter the opposite direction of full throttle. There will be a very slight delay before
reverse power is applied to the motor from the controller, and this is to prevent damage to the
gears of the car. If you cannot get the reverse speeds to work, you may have to readjust the
throttle position on the transmitter to allow for additional movement in the reverse direction.
TEMPFET PROTECTION
Your SP-520 controller is protected from overheating by a built in tempfet device. The
tempfet Is designed to prevent the controller from being damaged due to excessive heat. Some
high performance modified motors and running a car in grass, mud or deep sand can cause the
motor to work very hard. This causes overheating to the motor, controller and batteries. Should
you overheat the SP-520, it will automatically stop the car until the controller cools down. If you
should experience this, you should take the time to find the cause of the car working so hard.
This could be dragging parts, jammed wheels, too tight of a gear mesh, and broken parts. Always
check the car carefully before continuing to run the car. The SP- 560 will return to normal
operation In a few minutes.
ALUMINUM HEAT SINK AND SILICON BOOT
In any case where high speed running is done, rough terrain is encountered, or high powered
motors are used, always place the aluminum heatsink on the controller to assist in cooling the
controller. The SP-520 will be more efficient when it runs cooler. Also, the SP-520 has a silicon
heat sink boot which not only help the heatsink to attach to the controller, but it also transfers the
heat away from the controller and keeps the MOSFETS separated. Please leave the silicon boot
in place at all times.
ADDITIONAL TIPS
1. MONOLITHIC CAPACITORS
Motors on model cars generate static electricity which interferes with radio control equipment.
To prevent this from happening, it is necessary to place at least two (2) monolithic capacitors to
the motor of the car. These are supplied with the SP-520. Solder one end of a capacitor to the
positive (+) pole of the motor endbell and the other end to the metal casing of the motor. With
the second capacitor, solder one end to the negative (-) pole of the motor end bell to the same
place on the casing as the first capacitor.
2. AIR CIRCULATION
You can expect some heat to be felt by the heatsink of the SP-520. This is quite normal.
Because the SP-520 operates more efficiently when it is cool, always place the controller on the
car chassis in a position where it will receive plenty of air circulation.
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