SLASH VXL • 23
Adjusting Gear Mesh
Incorrect gear mesh is the most common cause of
stripped spur gears. Gear mesh should be checked
and adjusted anytime a gear is replaced.
To set the gear mesh, cut a narrow strip
of notebook paper and run it into the
gear mesh. Loosen the motor screws and
slide the motor and pinion gear into the
spur gear. Retighten the motor screws
and then remove the strip of paper. You
should be able to run a fresh strip of paper
through the gears without binding them.
Centering Your Servo
If you have removed the servo horn from your model’s steering
servo, or the servo has been removed for service or cleaning, the
servo must be re-centered prior to installation of the servo horn or
installation of the servo in the model.
1. Remove the servo horn from the steering servo.
2. Connect the steering servo to channel 1 on the receiver. Connect
the electronic speed control (ESC) to channel 2. The white wire on
the servo lead is positioned towards the receiver’s LED.
3. Turn the transmitter power switch on. Make certain the
transmitter’s batteries are not depleted.
4. Turn the transmitter’s steering trim knob to the center “0” position.
5. Disconnect motor wires “A” and “C” (see page 10) to prevent the
motor from turning during the next steps. Connect a fresh battery
pack to the speed control and turn on the ESC (see page 13). The
servo’s output shaft will automatically jump to its center position.
6. Install the servo horn onto the servo output shaft. The servo horn
should face toward the center of the chassis and be perpendicular
to the servo body.
7. Check servo operation by turning the steering wheel back and
forth to ensure that the mechanism has been centered properly
and you have equal throw in both directions. Use the transmitter’s
steering trim knob to fine-tune the position of the servo horn so
the model tracks straight when the steering wheel is at neutral.
ADVANCED VXL-3s ESC SETUP
The VXL-3s electronic speed control is capable of controlling
brushed, brushless, and sensored brushless motors. The VXL-3s auto-
detects the motor type and has numerous built-in safeguards to
prevent damage from mis-wiring or damaged wiring.
Sensorless Brushless Motors
Sensorless motors are the easiest and most reliable brushless motor
type. The VXL-3s is optimized to deliver the smoothest possible
sensorless motor performance. The Velineon 3500 is a sensorless
brushless motor (see sidebar for specs). The wiring (phase alignment)
of the motor determines its direction of rotation. Refer to the wiring
diagram on page 10.
Sensored Brushless Motors
The VXL-3s is fully compatible with sensored brushless motors.
Sensor motors use an additional sensor installed in the motor
to communicate rotor position to the speed control. The VXL-3s
features a covered auxiliary port that accepts aftermarket motor
sensors on the front face of the unit.
The VXL-3s has built-in Sensor Motor Backup
Protection to prevent damage if the sensor
leads or phase leads become disconnected.
If a sensor lead becomes damaged or is
disconnected, the VXL-3s automatically
switches to sensorless brushless operation.
The VXL-3s also features Sensor Phase Detection. When a sensored
brushless motor is connected, the VXL-3s will check for proper
wiring. If the motor phase wiring is incorrect, the VXL-3s will not
apply power to the motor until it is wired correctly.
Optional sensored brushless motor wiring diagram
:
Motor
Screws
Strip of
Paper
ADJUSTING YOUR MODEL
Velineon 3500 Specs
Type:
Sensorless brushless
RPM/volt:
3500 (10-turn)
Magnet type:
Ultra High-Temperature
Sintered Neodymium
Connection type :
3.5mm bullet
Wire size:
12 Gauge
Current Ratings:
200A constant
320A peak/burst
Max RPM:
50,000
Diameter:
36mm (1.42) (540 size)
Length:
55mm (2.165)
Weight:
262g (9.24oz)
The VXL-3s features Locked
Rotor Protection. The VXL-3s
checks to make sure the
motor is turning. If the motor
is locked or damaged, the
ESC will enter fail-safe until
the motor is free to rotate.
Always use the proper length
motor bolts. The standard
motor mounting bolts
are 3x8mm. Using motor
bolts that are too long can
interfere with the motor’s
rotation and damage the
motor’s internals!
