GRAUPNER X-4S HoTT SJ Operating Instructions Manual page 12

※Caution : When using LiPo 2 cell for receiver battery, you may protect
your battery from any damage by using optional smart box, which ensures
voltage adjustment and warning alarm function.
3) Port 4 (T/V connector) is designed that it will activate the beep and
LED indicator when your engine gets hot.
Warning alarm would be activated if the batter is discharged down to
70% from fully charged within voltage range (1.0V~25.5V). If you connect
the used battery which has already discharged capacity instead of fully
charged battery, the warning alarm will be activated when the capacity of
the used battery reaches down to 70% from its voltage capacity.
※Caution: It is not allowed to connect your battery to T/V Connector
directly. Please make sure to connect with Voltage/Temperature sensor
cable (S8362). This port is only for measurement for the voltage of
power battery. Please note that it is not for input power.
<Voltage/Temperature Sensor Configuration> - Item/Order No. S8362
* Ex Voltage (+): Connect ESC power connector (+)
* NTC Thermal: Connect Engine head
Connect sensor to Port 4(T/V Connector) as above. Temp sensor
should be installed on engine head and Volt sensor should be
installed on ESC power connector(+).
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※Caution: Warning alarm may not be activated, depending on
weather condition or mounting location.
If it is not activated, change mounting location or adjust temperature
value with optional smart box (Telemetry box). (Default value: 100℃)
Caution: For your safe use, we recommend fully charging your bat-
tery before use.
Warning alarm function is automatically activated when your battery
capacity is lower than 70%, regardless of power battery's charging
status.
4) Receiver Indicator LED's
LED OFF: Very good signal condition
LED blinks: Not good signal condition
LED ON: No signal