Function description: external controller, there are two types: 80V and 40V. 80V is for powerful electric chain saw.
working under speed control and double closed loop current control, it has brake function by which blade rotation can be stopped very quickly; The function of time delay for power cut after the tool is stopped working can realize zero power consumption.

Protective functions: over current protection; low voltage protection; overheat protection (for control board and motor); motor blocking protection; starting up protection etc.