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20 • XRT ULTIMATE
ADJUSTING THE ELECTRONIC SPEED CONTROL
• Solid Green: VXL-8s power-on light. Low-Voltage
Detection is ACTIVATED (LiPo setting).
• Current LED (A) Solid Red: The VXL-8s 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-8s
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 batteries.
• Current LED (A) Fast Blinking Red: The VXL-8s 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-8s will automatically shut down (fail-safe mode).
Stop driving the vehicle. The VXL-8s 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. To reset,
disconnect and then reconnect the batteries.
• Voltage LED (V) Solid Red: The VXL-8s 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-8s will
limit the power output to 50% throttle. Stop driving
the model. The VXL-8s will stay in this mode until the
battery voltage is recovered or fully charged batteries are
connected.
• Voltage LED (V) Slow Blinking Red: The VXL-8s has
entered Low Voltage Protection, Stage 2. When the
battery voltage attempts to fall below the minimum
threshold, the VXL-8s 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-8s will stay in this mode until
fully charged batteries are connected.
• Voltage LED (V) Fast Blinking Red: If the motor has no
power, the VXL-8s has entered Overvoltage Protection.
If the battery voltage from the connected battery packs
is too high, the VXL-8s will go into a fail-safe mode.
WARNING: If input voltage exceeds approximately 33.6
volts (16.8 maximum peak input voltage per battery
pack), the ESC may be damaged. Do not exceed 33.6
maximum total peak voltage. Stop driving the model and
disconnect the batteries.
• Temperature LED ( ) Solid Red: The VXL-8s has entered
A V
Thermal Shutdown Protection, Stage 1 to guard against
overheating caused by excessive current flow. The VXL-8s
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-8s has
A V
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-8s 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
batteries and contact Traxxas Customer Service for
assistance.
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