Lifan 620 Maintenance Manual page 211

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EX/LX/DX: Press the window glass controller for ≤300ms, corresponding window glass will
descend, the window lifter will power off till touch the bottom. If the detection signal is lost when
touch the bottom, then the window lifter will work for 8 seconds at one time and stop to protect the
motor. If another rise or descending operation is ordered during the descending, then the
descending stops, and the window lifter will power off till touch the bottom.
Certain functions of power window system depend on the control of its electronic module, which is
integrated into the switch component of left front door glass frame riser as well as the BCM body
controller.
System components as follows:
(1) Power window switch
(2) Power window motor
(3) BCM body controller
The latest technology, technique and material are applied to the power window system, for
example, to ensure good waterproof performance, hermetic design is adopted together with
waterproof and breathable film (the motor is easy to have differential pressure compared to the
outside when temperature rises during motor running, then the weakest point of sealing is likely to
break up, therefore, the motor needs an apparatus which can breathe to balance the pressure
difference, so as to relieve the impact on the weakest point of sealing, and the breathable film is
the right one, because it can not only balance the pressure difference by gas, but also can prevent
liquid water from entering the motor, to perfectly meet hermetic requirements); regarding overheat
protection, polymer PTC overcurrent protector is used to promptly and effectively protect the motor
from burning resulting from external fault (such as a switch fault); considering acoustic treatment,
special design is adopted on the rotating shaft of super shock absorption and fine abrasion
resistance to prevent the metallic impact and rubbing noise from occurring during high speed
rotation; with respect to power ground, interface is directly connected without lead wire, so faults
like poor contact of the wire are avoided; the structure of bipolar DC with permanent magnetism is
applied to have bilateral rotation, overheat protection device equipped inside, independent from
external electrical protection; when the motor powers on, under the effect of magnetic force, the
motor rotates, and decelerates through a big turbine reducer to generate low speed high pulling
torque at output gear, when the motor is jammed or an electrical fault occurs, the overheat
protection device can cut off the power immediately, to protect the motor. To protect the motor
from probable overheat damage resulting from continual rise or descending operation of power
window, automatic protection of circuit is available, and after a stop of five minutes, the circuit will
recover automatically.
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