21
Intelligent Safety Warning System
In the following cases, Ninebot will limit its maximum speed.
• Excessive Speed: When riding the PTR at excessive speeds (4~12 km/h [2.5-7.5 mph] in limit speed mode, and 18~22 km/h
[11-13.6 mph] in balance mode), the Operation Bar leans back, pushing the rider backward and preventing acceleration.
Adjust your body to keep at least a fist’s distance from the Operation Bar. The PTR may lose balance and you can lose
control, fall, or have a collision if you keep pushing forward against the Operation Bar.
• Overloading or Staying on a Slope for an Extended Time: An intelligent safety warning will be triggered and the Operation Bar
will lean back to remind the rider to get off when the payload or performance requirements of the PTR surpass specified
safety limits. If this happens, the rider must immediately dismount and push Ninebot ahead using power assistant mode. If
the rider does not dismount, and the overload conditions remain, the PTR will enter stand-by mode (non-balancing) after
5 seconds. It may happen in the following cases: stopping/maintaining position on a steep slope, PTR payload capacity
exceeded (see Appendix A – Specifications).
• Low Battery Power: When the battery charge level is less than 40%, the maximum speed in balance mode will be limited to
around 14 km/h (8.7 mph).
Figure 16: Automatic Speed Limiting
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