YH912-II-100 speed regulating system control circuit

In the figure, limit switches sQi and SQ2 are installed on the voltage regulator TY, serving as
the upper and lower limit (terminal) protection of the voltage regulator itself respectively; SQ3 is the lowest speed limit. SQ4 and sQs are low-speed (such as corresponding armature voltage
60V) limit switches. When adjusting, the vehicle speed corresponding to the sQs action is slightly higher than the vehicle speed corresponding to the SQ4 action; SQ6 is the highest
-speed limit switch, generally when the armature voltage reaches 190V (corresponding to the maximum vehicle speed).