Textile warping machine magnetic control circuit

Magnetic control circuit: as shown in the figure. When the circuit is first connected, since the voltage across the capacitor G
cannot change suddenly, the voltage at the control terminal 5 of the integrated circuit IC 2 is low voltage
, so 1C2 is cut off. As the operator steps on the foot pedal to turn the warper from slow to
normal operation, the permanent magnet rotating synchronously with the warper causes the Hall magnet control integrated
circuit H to generate pulses. This pulse passes through capacitors C2 and G. Diodes VD1 and VD2
double the voltage and rectify, and the DC voltage generated at both ends of the resistor turns VT on. When
the charging of capacitor C4 has not reached the turn-on voltage of the control terminal of integrated circuit IC2, capacitor
C4 is short-circuited by the conducting VT, and integrated circuit IC2 is always in a cut-off state. When
the warping machine stops for some reason. The Hall integrated circuit loses the effect of the rotating magnetic field and stops
working. Due to the DC blocking effect of the capacitor C2, VT loses the bias voltage and is cut off. The capacitor C4
is charged through the resistor RP. If the parking time exceeds the time constant of RP and G.
The voltage at both ends of c4 will reach the opening voltage of the control end of integrated circuit IC2. IC 2 is turned on, relay JS2 is energized, its normally closed contact JS2 is disconnected
, contactor KM1 is released, and the motor stops.