The operation of an electric sun-roof is similar to the motor reverse circuit
discussed earlier in this chapter. However, further components and circuitry
are needed to allow the roof to slide, tilt and stop in the closed position. The
extra components used are a micro switch and a latching relay. A latching relay
works in much the same way as a normal relay except that it locks into position
each time it is energized. The mechanism used to achieve this is much like that
used in ball-point pens that use a button on top.
The micro switch is mechanically positioned such as to operate when ...
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