392 f
4.2 v
Pg. 2/4
3. Overheat Fail Safe (First Menu Screen)
• To access the Temperature Fail Safe Screen, press the SET button once.
• The Fail Safe temperature can be set in 5º C increments from 50-200 ºC or 9º F increments
from 122-392º F.
NOTE! REFER TO YOUR ENGINE MANUAL FOR RECOMMENDED SAFE OPERATING
TEMPERATURES FOR YOUR SPECIFIC ENGINE.
• To adjust the Overheat set temp, press the UP or DOWN button (Fig a).
• Please see Step 5 to set the Throttle Servo Limiter.
(Fig a)
4. Voltage Fail Safe (Second Menu Screen)
• To access the Voltage Fail Safe Screen, press the SET button twice.
• The Voltage Fail Safe can be set in 0.1 volt increments from 3.0 to 5.4 volts.
NOTE! Venom recommends a setting of no less than 4.2 volts.
• To adjust the low voltage set value, press the UP or DOWN button.
• Please see Step 5 to set the Throttle Servo Limiter.
SET
SET
SET
The Venom Overheat Fail Safe is the best way to protect your nitro engine from serious damage that can occur when a nitro
engine overheats. Once the overheat temp is set, the VST will constantly monitor your engine temperature. In the event
the temperature exceeds the set temp, the VST will engage the Overheat Fail Safe and limit the percentage of throttle
available until the engine temperature drops 5º C (9º F) or more below the set point. After the temp drops below the set point,
the Overheat Fail Safe Mode will automatically disengage and return the model to its full operating potential.
Racers Note: The VST is a great tuning aid for monitoring peak temperatures during race prep and track testing but
the feature can be turned off for racing if desired (See Step 5).
The Voltage Fail Safe uses the same safety features as the Overheat Fail Safe but instead of monitoring engine temp,
it monitors the voltage of the receiver battery pack. The receiver battery pack supplies power to all of the on-board electronics
on your model, including the servos. If the voltage of the receiver pack drops too low, the system will not have enough power
to signal the servos and they will “stick” in the position of the last signal received. If the last signal was wide open throttle, the
car will become an out of control safety hazard. After you set the minimum safe voltage using the instructions below, the VST
will constantly monitor the receiver battery pack voltage. If the system records two consecutive voltage readings below the
minimum safe voltage, the Voltage Fail Safe will be activated. When the VST records the first voltage reading above the
minimum safe voltage, it will disengage the voltage fail safe function and return the model to it’s full operating potential.
In the Throttle Servo Limiter screen, the VST can be programmed to reduce the amount of throttle available during a Low
Voltage or Overheat situation. When either the Voltage Fail Safe or Overheat Fail Safe is engaged, the VST will
reduce the maximum throttle available to your choice of 20%, 40%, 60%, 80%, or 99% of normal throttle limit.
Racers Note: If you wish to effectively disengage the voltage and temperature fail safe options, set the throttle throw
percentage to 99%.
60 P
5. Throttle Servo Limiter for Temperature / Voltage Fail Safe (Third Menu Screen)
• To access the Throttle Servo Limiter menu,
press the SET button three times.
• To adjust the throttle percentage value,
press the up or down button.
• The number refers to the percentage of full
servo travel that will be available when
the fail safe is activated (See Fig b).
• The value can be set to 20%, 40%, 60%,
80%, or 99%.
SET
v = Voltage Fail Safe Setup Screen
SET SET
c or f = Max Temp Fail Safe Setup Screen
SET
p = Throttle Servo Limiter Setup Screen
Fig b
Full Throttle
100%
Idle
0%
Brakes
99%
Note:
Drawing is for reference
only. Your Servos and
their functioning may
vary.
60%
40%
20%
80%
NOTE! The VST Voltage Fail Safe will not engage if there is a total battery failure
(ex. battery falls out of the model during a crash).
