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• Solid Green: VXL-4s power-on light. Low-Voltage
Detection is ACTIVATED (LiPo setting).
• Current LED (A) Solid Red: The VXL-4s has entered
Overcurrent Protection, Stage 1. When excessive
current flow (amperage) is being routed through the
power system caused by failure to use the appropriate
gearing ratio for the drivetrain and the driving surface,
the VXL-4s will limit the power output to 50% throttle.
Make sure your model is properly geared for the
driving conditions. Before continuing, inspect the
vehicle for damage. To reset, disconnect and then
reconnect the battery.
• Current LED (A) Fast Blinking Red: The VXL-4s has
entered Overcurrent Protection, Stage 2. When
the current flow (amperage) spikes temporarily due
to a bound or restricted driveline (model is stuck
against an object or encountered a restrictive driving
surface), the VXL-4s will automatically shut down (fail-
safe mode). Stop driving the vehicle. The VXL-4s will
stay in this mode until the current flow is recovered
(obstruction is removed, model is moved to a
smoother driving surface) and the throttle is returned
to neutral. Also, if the motor becomes damaged
during driving, the VXL-4s will enter this mode any
time the throttle is applied.
• Voltage LED (V) Solid Red: The VXL-4s has entered
Low Voltage Protection, Stage 1. When the battery
voltage begins to reach the minimum recommended
discharge voltage threshold for LiPo battery packs,
the VXL-4s will limit the power output to 50% throttle.
Stop driving the model. The VXL-4s will stay in this
mode until the battery voltage is recovered or a fully
charged battery is connected.
• Voltage LED (V) Slow Blinking Red: The VXL-4s has
entered Low Voltage Protection, Stage 2. When the
battery voltage attempts to fall below the minimum
threshold, the VXL-4s will automatically shut down
(fail-safe mode). The LED on the speed control will
slowly blink red, indicating a low-voltage shutdown.
Stop driving the model. The VXL-4s will stay in this
mode until a fully charged battery is connected.
ADJUSTING THE ELECTRONIC SPEED CONTROL
• Voltage LED (V) Fast Blinking Red: If the motor
has no power, the VXL-4s has entered Overvoltage
Protection. If the battery voltage from the connected
battery packs is too high, the VXL-4s will go into a
fail-safe mode. WARNING: If input voltage exceeds
approximately 16.8 maximum peak input voltage, the
ESC may be damaged. Do not exceed 16.8 maximum
total peak voltage. Stop driving the model and
disconnect the battery.
• Temperature LED ( ) Solid Red: The VXL-4s has
A V
entered Thermal Shutdown Protection, Stage 1 to
guard against overheating caused by excessive current
flow. The VXL-4s will limit the power output to 50%
throttle. Stop driving the model. Inspect the cooling
fan on the ESC to make sure it is operating. Allow the
power system to cool before continuing.
• Temperature LED ( ) Fast Blinking Red: The VXL-4s
A V
has entered Thermal Shutdown, Protection Stage 2
and has automatically shut down (fail-safe mode). Stop
driving the model. Inspect the cooling fan on the ESC
to make sure it is operating. Allow the power system
to cool before continuing. If you are experiencing
frequent warnings about temperature, it could be
caused by overgearing (from stock), overly aggressive
and continuous high speed driving, vehicle damage,
or driving in conditions such as deep sand, heavy mud,
and tall grass.
• Current/Voltage/Temperature LEDs Solid Red or
all LEDs Fast Blinking Red: The VXL-4s has entered
this protection mode due to possibly having Thermal
Shutdown Protection and Low Voltage Protection
(see above) occur at the same time or there is a
critical functioning or programming error. Disconnect
the battery and contact Traxxas Customer Service for
assistance.
MAXX • 19
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