Control Circuit

Three-phase motor for jog brake circuit(b)

Published:2011/7/10 1:18:00 Author:Lucas | Keyword: Three-phase motor, jog brake

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Three-phase motor phase-off protection circuit

Published:2011/7/10 1:21:00 Author:Lucas | Keyword: VD1, Three-phase motor

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Three-phase motor phase-off over-current protection circuit

Published:2011/7/10 1:36:00 Author:Lucas | Keyword: VD5, Three-phase motor

The figure shows a rather practical circuit. When ST is pressed, KM pulls to start the motor M. The current transformer TA output current through the secondary side. The current forms a voltage signal through the VD1 rectifier and partial pressure by RP and R1. The voltage signal is added to the base VT1 through R2 and VD6. The other signal VT3 added to the base through RP. VT1, VT2 and VT3 form an emitter coupled bitable circuit. During the normal operation, VT1 ends and VT2 and VT3 are saturated to conduct. Then the relay K pulls to drive the motor M to run normally.   (View)

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Three-phase motor for against phase-phase short circuit commutation circuit

Published:2011/7/10 1:57:00 Author:Lucas | Keyword: Three-phase motor, phase-phase short circuit

During the revering of the motor, the contactor’s main contacts may cause rather serious arcing phenomenon due to operation or for some other reasons. If the arc has not been completely extinguished, the reverse AC contactor pulls to cause phase-phase short circuit. Just as shown in the circuit, an AC contactor KM is used to solve the phase-phase short circuit. During the reversing process of positive and negative, the forward contactor KMF powers off. And the contactor KM (that is the additional one) also disconnect. Therefore, four break interrupters are created. It can effectively extinguish the arc and avoid the phase-phase short circuit failure.   (View)

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Three-phase motor used for asynchronous generator load distribution circuit

Published:2011/7/10 2:04:00 Author:Lucas | Keyword: 2QS2, Three-phase motor, asynchronous generator

The figure shows the circuit which is applied to distribute the load with small capacity. At this moment, the main capacitor C1, auxiliary capacitor C2 and compensation capacitor C3 are installed on the power distribution screen of the induction generator. The screen is also equipped with lightning protection and over-voltage device. That is the surge arrester.   (View)

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Three-phase motor with pre-selection switch commutation circuit

Published:2011/7/10 2:10:00 Author:Lucas | Keyword: Three-phase motor, pre-selection switch

Just as shown in the figure, a selector switch SA (which is available of transfer switch, toggle switch, etc.) is used. Before the boot, select positive to start the motor by turning in forward rotation. Instead, select negative to start the motor to run in reverse.   (View)

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examination to broken rotor bar of three-phase motor

Published:2011/7/10 2:25:00 Author:Lucas | Keyword: rotor, three-phase motor

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Three-phase motor for single-line remote commutation circuit

Published:2011/7/10 0:11:00 Author:Lucas | Keyword: Three-phase motor, single-line remote commutation

In some cases, it is needed to control motor’s starting-stopping and switching operation far away from the motor. The circuit designed for meeting this requirement is shown in the figure. Set up a wire (single wire) just as shown in the figure and select the “remote control selector switch SA. When the SA is at the position 1 , the local motor stops working. When the SA is at the position 2 , the local relay K1 creates the loop by passing through VD3, ground, VD1, SA and transformer T. When the K1 takes action, its contact connects to coil circuit of the AC contactor. And the motor transfers to run forward.   (View)

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Three-phase motor with a relay for inverting circuit

Published:2011/7/9 23:59:00 Author:Lucas | Keyword: Three-phase motor, relay

K relay is used to extend switching time for forward and reverse steering. As a result, it can avoid simultaneous suction of KMF and KMR on the reverse run. It also increases the chain reliability between the contactor and the button.   (View)

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Three-phase motor using limit switch for automatically stopping inverting circuit

Published:2011/7/9 23:50:00 Author:Lucas | Keyword: Three-phase motor, limit switch

As shown in the figure, limit switches SA1 and SA2 are used to achieve the control for automatically stopping the forward and reverse running. When the mechanical impact block is driven by the motor to hit the SA1 or SA2, it means that it is equivalent to have pressed the stop button. Then the contactor KMF or KMR lose power to stop the motor.   (View)

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Three-phase motor using the limit switch for inverting circuit

Published:2011/7/9 23:27:00 Author:Lucas | Keyword: Three-phase motor, limit switch

As shown in the figure, two limit switches SA1 and SA2 are used to achieve the automatic control of reciprocation. It utilizes the use of motor to drive mechanical impact limit switch SA1 to achieve forward run’s self-closing (KMF’s off). Meanwhile, the closure for SA1’s interlocking contact is to achieve reversal self-opening (KMR’s closure). And vice verse.   (View)

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Three-phase motor using three-contactor for inverting circuit

Published:2011/7/9 23:18:00 Author:Lucas | Keyword: Three-phase motor, three-contactor

Just as shown in the circuit, the three AC contactors named KMF, KMR and KM are used, which means that each time breaking the motor, the main contact point would grow to four off-points (that is two contacts more than that of the two-contactor). Therefore, it can effectively extinguish the arc of the contactor and can prevent arcing fault.   (View)

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Three-phase motors for jog commutation circuit

Published:2011/7/10 1:08:00 Author:Lucas | Keyword: Three-phase motor, jog commutation

Just shown in the figure, the left circuit is the primary circuit (main circuit) and the right circuit is the secondary circuit (control circuit, the operating circuit). FT is the thermal relay. When STF is pressed, the AC contactor KMF pulls to drive the main contacts of KMF to take action. Then the motor rotates forward (forward). When STF is released, the motor stops working. It is called forward jog . When STR is pressed, KMR pulls to drive the main contact of KlMR to take action. Then the motor rotates in reverse (reverse). When the STR is released, the motor stops rotating. So it is called reverse jog.   (View)

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The CW168 application circuit of the infrared control

Published:2011/7/8 20:22:00 Author:Seven | Keyword: application circuit, infrared control

The CW168 application circuit of the infrared control CW168In the figure, the infrared receiver gets the 38kHz modulation signal from the emitter, after the signal is amplified and detected, it is sent to the base pole of VT1, and VT1 is saturated and conducted, CW168 is triggered and getting into work. The circuit can work in single and continuous type or select tones.   (View)

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Three-phase motor using proximity switch for automatically stopping inverting circuit

Published:2011/7/9 23:09:00 Author:Lucas | Keyword: Three-phase motor, proximity switch

Just as shown in the circuit, 1SQ and 2SQ both are the non-contact new transistor proximity switch. And STF and STR are respectively forward and reverse button switches. When STF is pressed, KMF pulls to drive the motor to run forward. When it is to a qualified location, the metal plate on the machine rises to close the 1SQ and its internal contacts disconnect to drive the KMF coil to lose power. Then the motor stops. Compared to mechanical limit switch, non-contact transistor proximity switch has better performance, more reliability and longer service life.   (View)

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The fire alarm circuit with the metal plate as the fog sensor

Published:2011/7/10 10:27:00 Author:Seven | Keyword: fire alarm, metal plate, fog sensor

The circuit is shown in the figure, which consists of the fog inducting elements, ON/OFF electric switch, analog sound circuit and AC step-down rectifier circuit, etc. It can be used as the simple fog inducting fire alarm.   (View)

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The alarm circuit

Published:2011/7/8 20:30:00 Author:Seven | Keyword: alarm circuit

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The alarm flashing lamp circuit

Published:2011/7/8 20:39:00 Author:Seven | Keyword: alarm flashing lamp

The circuit includes the AC voltage generator, transformer or transistor AC voltage converter, the power that the flash needs can be adjusted by the potentiometer Rp1 according to need. When the thyristor is blocked, the flash transformer discharges, the capacitor is charged by the 2.2MΩ resistor. When the potentiometer Rp2 smooth contactor voltage is lower than the little Ne pipe, the pipe is conducting, the thyristor is also conducting, so the 0.2μF capacitor discharges, the flashing transformer provides power for the flash pipe.   (View)

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Three-phase motor button interlocking for switching circuit

Published:2011/7/9 22:49:00 Author:Lucas | Keyword: Three-phase motor, button

The three-phase motor button interlocking for switching circuit is shown in the figure. This circuit uses a composite button (this is that a button has a pair of normally opened contacts and a pair of normally closed contacts inside, thus ensuring the simultaneous action while being pressed), in order to achieve the button’s interlocking connection. When the motor is running forward, press the button STR to make the KMF lose electricity immediately. And the motor stops and run into the reverse immediately. And vice versa. This not only ensures the not simultaneous action of the reversing contactor KMF and KMR, but also ensure that it start in reverse by directly pressing reverse button rather than the stop button.   (View)

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The electric target circuit (exporting to Europe and America, etc)

Published:2011/7/10 8:38:00 Author:Seven | Keyword: electric target circuit

To express thanks to the friends' support, here is to introduce the electric target circuit, which is being produced (to Europe and America, etc) to everybody for reference. As the parts of the source codes and target plate can't be offered, I beg you pardon. This target has five game rules, which allow 1-4 people to play with, and it also has the music and color lamp effect.   (View)

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