SPECIFICATIONS
FORWARD REVERSE
• Peak amperage capability 560A 240A
• Continuous amperage capability 140A 60A
• Voltage loss 0.0125 ohm 0.025 ohm
• BEC voltage output 5.6V
• TEMPFET cutoff point 250 degrees F (120
0
C)
• Dimensions 1.77x2.16x0.78 inch (45x55x20mm)
• Weight (with heat sink) 2.6 oz (75 g)
INSTALLING THE SP-520 POWER
1. MOUNTING LUGS
Installation of the SP-520 Is made easy for the car driver with the use of the servo style
mounting lugs. These lugs are also removable by separating the case halves of the controller and
allowing the mounting lugs to slide out.
2. CONNECTORS
If you have TAMIYA style connectors on your car, the SP-520 will be an exact match for
you. However, if you choose to use different connectors for your SP-520, please see the section
of these instructions which describe the wiring diagram and how to hookup the SP-520.
3. MOUNTING & CONNECTING
Mount the SP-520 Into place within the chassis of your car, using the mounting lugs or double
sided tape on the back of the case. Please Insure that the controller is securely held In place.
Once the controller Is in place, disconnect the motor wires and connect the main battery wires
from the car battery to the controller.
Note Always check the polarity of the wires prior to plugging in the battery to the controller.
Reversing the polarity may result In damage to the controller, despite the reverse polarity
protection within the SP-520. If you do accidentally connect the controller In reverse polarity,
Immediately disconnect the wires and allow the controller to rest for at least one minute. Check
for the correct polarity and then reconnect the main battery wires using the correct polarity. The
SP-520 should now operate normally.
Once the main battery and controller are connected, turn the car radio and transmitter to the
“ON” position. Check to see if the red or green indicator light on the SP-520 comes “ON” when
you advance the throttle stick forward. If not, the transmitter reversing switch should be used to
correct the direction. Check the operation of the steering servo for proper movement too. If the
radio functions correctly, place the car on a block or car stand so that the rear wheels are not
touching the ground. Connect the motor wires and be aware that the motor may begin running at
this time.
4. NEUTRAL SETTING
If the motor begins running, you must set the neutral position of the controller. Make sure you
set the throttle on the transmitter to neutral and the trim lever for throttle in the middle. Using the
supplied tuning wand, insert the wand into the neutral adjustment hole on the SP-520 controller.
Slowly turn the neutral controller potentiometer one direction or the other until the motor stops,
and the red indicator light on the controller just goes out. This is the correct position for the
neutral adjustment. The motor should now move the wheels in the correct direction when
commanded from the transmitter. If not and the car runs in reverse, check again if the red or
green indicator light comes “ON” while advancing the throttle stick forward, If yes, the motor
wires were cross connected. Correct it by changing the polarity of the motor wires in reverse. If
no light comes “ON”, correct the direction by using the reversing switch of transmitter.
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