CN211555707U - Protective circuit for preventing contact adhesion of contactor - Google Patents
Protective circuit for preventing contact adhesion of contactor Download PDFInfo
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- CN211555707U CN211555707U CN201922200762.7U CN201922200762U CN211555707U CN 211555707 U CN211555707 U CN 211555707U CN 201922200762 U CN201922200762 U CN 201922200762U CN 211555707 U CN211555707 U CN 211555707U
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Abstract
The utility model discloses a protective circuit for preventing contact adhesion of a contactor, which comprises a main contactor KM1 and a breaker Q which are arranged on a three-phase power main loop of a motor; a main contactor KM1 coil, an intermediate relay KA1 coil, a start button SB2 and a stop button SB1 form a control loop, and the main contactor KM1 coil is connected with an intermediate relay KA1 coil in parallel; an intermediate relay KA1 coil and a power-off delay time relay KT coil are connected in series in a main loop, an undervoltage tripping TK coil is installed in a circuit breaker Q, and the undervoltage tripping TK coil is connected with a normally closed contact of the power-on delay time relay KT. The utility model discloses install undervoltage release additional in traditional motor control circuit breaker, after the coil disconnection of motor main contactor, the trouble of contactor contact adhesion appears, if main contactor still under output voltage's the condition, can trigger the action of circuit breaker release, cuts off the circuit breaker in the short time, makes the outage of motor major loop, eliminates the potential safety hazard.
Description
Technical Field
The utility model relates to a hoist engine motor control technical field, specific prevent contactor contact adhesion protection circuit that says so.
Background
In the motor control of hoists such as crown blocks, elevators and the like, a circuit breaker, a contactor and a thermal relay are often adopted to control and protect a motor, the circuit breaker and the thermal relay are used for protecting the motor against overload, phase loss, locked rotor, short circuit, overvoltage, undervoltage, electric leakage, three-phase imbalance, overheating and the like, and the contactor is used for starting and stopping control. However, if the contact adhesion fault of the contactor occurs to the running motor, the main loop power supply of the motor cannot be cut off by various protections at this time, the motor can still continue to run in an electrified mode, particularly, the fault of the motor which is frequently started and stopped is high, potential safety hazards exist, and the damage to objects and personnel is easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prevent contactor contact adhesion protection circuit, through the control of this circuit, prevent behind the contactor coil disconnection, can trigger the action of circuit breaker tripper under the trouble of contactor contact adhesion appears, cuts off the circuit breaker in the short time, makes the outage of motor major loop, eliminates the potential safety hazard.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a protection circuit for preventing contact adhesion of a contactor comprises a main contactor KM1 and a breaker Q, wherein the main contactor KM1 and the breaker Q are installed on a main loop of a three-phase power supply of a motor; in the control loop, the voltage is reduced to 36v safety voltage through a transformer, a coil of a main contactor KM1, a coil of an intermediate relay KA1, a start button SB2 and a stop button SB1 form the control loop, and the coil of the main contactor KM1 is connected with a coil of an intermediate relay KA1 in parallel; an intermediate relay KA1 coil and a power-off delay time relay KT coil are connected in series in a main loop, an undervoltage tripping TK coil is installed in a circuit breaker Q, and the undervoltage tripping TK coil is connected with a normally closed contact of the power-on delay time relay KT.
Preferably, the model of the breaker Q is a DW15 breaker, and the model of the coil of the undervoltage release TK is: when the voltage flowing through the coil of the TK on the three-phase power supply loop of the motor is reduced to 85% of the power supply voltage, the coil of the TK acts through the AC 380V.
Preferably, the model of the KT coil of the power-off delay time relay is H3BA-8, and the power-on delay time relay is powered on for 2 s.
Preferably, a thermal relay FR is installed on the three-phase power circuit of the motor.
Preferably, a fuse FU is installed on a loop connecting the control transformer TB and the three-phase power supply.
The utility model discloses specific working process does:
when the motor is normally started, the starting button SB2 is pressed, the main contactor KM1 is attracted, a three-phase power supply loop of the motor is electrified, the motor operates, the main contactor KM1 is attracted, the intermediate relay KA1 coil is also attracted, the electrifying delay normally closed contact switch of the intermediate relay KA1 coil is disconnected, the coil of the power-off delay time relay KT is not electrified, the electrifying delay normally closed contact switch of the power-off delay time relay KT coil does not act, the TK coil of the undervoltage release does not act, and the breaker Q is still attracted.
When the motor normally stops, the main contactor KM1 is disconnected by pressing the stop button SB1, and the intermediate relay KA1 coil is also disconnected, if the contact of the main contactor KM1 is not adhered to cause a fault, the main contactor KM1 does not output voltage, the power-off delay time relay KT coil is not electrified, the power-on delay normally-closed contact switch of the power-off delay time relay KT coil does not act, the normally-closed state is still kept, the under-voltage release TK coil connected with the breaker Q does not act, and the breaker Q still keeps in a suction state; when the main contactor KM1 is adhered in the motor operation process, or when any phase of the main contactor KM1 is adhered with a contact, the stop button SB1 is pressed, the contact of the main contactor KM1 is attracted due to adhesion, at the time, the coil of the intermediate relay KA1 is disconnected, the normally closed contact of the intermediate relay KA1 is reset and attracted, if the contact of any phase of the main contactor KM1 is adhered with voltage output, the coil of any phase of the power-off delay time relay KT is attracted, after the power-off delay time relay KT delays for 2S, the power-on delay normally closed contact switch of the power-off delay time relay KT is disconnected, the coil of the undervoltage release TK connected with the breaker Q is disconnected, the undervoltage release TK acts, the breaker Q is disconnected, the three-phase power circuit of the motor is disconnected, and the motor is protected from continuous operation.
The action range of the coil of the under-voltage release TK is as follows: when the voltage flowing through the coil of the TK on the three-phase power supply loop of the motor is reduced to 85% of the power supply voltage, the coil of the TK acts.
The utility model discloses install undervoltage release additional in traditional motor control circuit breaker, after the coil disconnection of motor main contactor, the trouble of contactor contact adhesion appears, if main contactor still under output voltage's the condition, can trigger the action of circuit breaker release, cuts off the circuit breaker in the short time, makes the outage of motor major loop, eliminates the potential safety hazard.
The utility model has simple circuit design and convenient installation; the transformation cost is low, and the implementation is easy.
Drawings
Fig. 1 is an electrical schematic diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The protection circuit for preventing the contact of the contactor from being adhered to the contact of the contactor as shown in figure 1 comprises a main contactor KM1 and a breaker Q which are arranged on a main loop of a three-phase power supply of a motor; in the control loop, the voltage is reduced to 36v safety voltage through a transformer, a coil of a main contactor KM1, a coil of an intermediate relay KA1, a start button SB2 and a stop button SB1 form the control loop, and the control loop is characterized in that: the coil of the main contactor KM1 is connected with the coil of the intermediate relay KA1 in parallel; an intermediate relay KA1 coil and a power-off delay time relay KT coil are connected in series in a main loop, an undervoltage tripping TK coil is installed in a circuit breaker Q, and the undervoltage tripping TK coil is connected with a normally closed contact of the power-on delay time relay KT.
The model of circuit breaker Q is DW15 circuit breaker, and the model of undervoltage release TK coil is: when the voltage flowing through the coil of the TK on the three-phase power supply loop of the motor is reduced to 85% of the power supply voltage, the coil of the TK acts through the AC 380V.
The model of a KT coil of the power-off delay time relay is H3BA-8, and the power-on delay time relay is powered on for 2 s.
And a thermal relay FR is arranged on a three-phase power supply loop of the motor.
And a fuse FU is arranged on a connecting loop of the control transformer TB and the three-phase power supply.
The utility model discloses specific working process does:
when the motor is normally started, the starting button SB2 is pressed, the main contactor KM1 is attracted, a three-phase power supply loop of the motor is electrified, the motor operates, the main contactor KM1 is attracted, the intermediate relay KA1 coil is also attracted, the electrifying delay normally closed contact switch of the intermediate relay KA1 coil is disconnected, the coil of the power-off delay time relay KT is not electrified, the electrifying delay normally closed contact switch of the power-off delay time relay KT coil does not act, the TK coil of the undervoltage release does not act, and the breaker Q is still attracted.
When the motor normally stops, the main contactor KM1 is disconnected by pressing the stop button SB1, and the intermediate relay KA1 coil is also disconnected, if the contact of the main contactor KM1 is not adhered to cause a fault, the main contactor KM1 does not output voltage, the power-off delay time relay KT coil is not electrified, the power-on delay normally-closed contact switch of the power-off delay time relay KT coil does not act, the normally-closed state is still kept, the under-voltage release TK coil connected with the breaker Q does not act, and the breaker Q still keeps in a suction state; when the main contactor KM1 is adhered in the motor operation process, or when any phase of the main contactor KM1 is adhered with a contact, the stop button SB1 is pressed, the contact of the main contactor KM1 is attracted due to adhesion, at the time, the coil of the intermediate relay KA1 is disconnected, the normally closed contact of the intermediate relay KA1 is reset and attracted, if the contact of any phase of the main contactor KM1 is adhered with voltage output, the coil of any phase of the power-off delay time relay KT is attracted, after the power-off delay time relay KT delays for 2S, the power-on delay normally closed contact switch of the power-off delay time relay KT is disconnected, the coil of the undervoltage release TK connected with the breaker Q is disconnected, the undervoltage release TK acts, the breaker Q is disconnected, the three-phase power circuit of the motor is disconnected, and the motor is protected from continuous operation.
The action range of the coil of the under-voltage release TK is as follows: when the voltage flowing through the coil of the TK on the three-phase power supply loop of the motor is reduced to 85% of the power supply voltage, the coil of the TK acts.
The utility model discloses install undervoltage release additional in traditional motor control circuit breaker, after the coil disconnection of motor main contactor, the trouble of contactor contact adhesion appears, if main contactor still under output voltage's the condition, can trigger the action of circuit breaker release, cuts off the circuit breaker in the short time, makes the outage of motor major loop, eliminates the potential safety hazard.
Claims (4)
1. A protection circuit for preventing contact adhesion of a contactor comprises a main contactor KM1 and a breaker Q, wherein the main contactor KM1 and the breaker Q are installed on a main loop of a three-phase power supply of a motor; in the control loop, the voltage is reduced to 36v safety voltage through a transformer, a coil of a main contactor KM1, a coil of an intermediate relay KA1, a start button SB2 and a stop button SB1 form the control loop, and the control loop is characterized in that: the coil of the main contactor KM1 is connected with the coil of the intermediate relay KA1 in parallel; an intermediate relay KA1 coil and a power-off delay time relay KT coil are connected in series in a main loop, an undervoltage tripping TK coil is installed in a circuit breaker Q, and the undervoltage tripping TK coil is connected with a normally closed contact of the power-on delay time relay KT.
2. The protection circuit of claim 1, wherein: the model of the breaker Q is a DW15 breaker, and the model of the coil of the undervoltage release TK is as follows: when the voltage flowing through the coil of the TK on the three-phase power supply loop of the motor is reduced to 85% of the power supply voltage, the coil of the TK acts through the AC 380V.
3. The protection circuit for preventing the contact of the contactor from being stuck as claimed in claim 1 or 2, wherein: the model of the KT coil of the power-off time delay relay is H3BA-8, and the power-on time delay relay is powered on for 2 s.
4. The protection circuit of claim 3, wherein: and a thermal relay FR is arranged on the three-phase power supply loop of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922200762.7U CN211555707U (en) | 2019-12-10 | 2019-12-10 | Protective circuit for preventing contact adhesion of contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922200762.7U CN211555707U (en) | 2019-12-10 | 2019-12-10 | Protective circuit for preventing contact adhesion of contactor |
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| Publication Number | Publication Date |
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| CN211555707U true CN211555707U (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922200762.7U Active CN211555707U (en) | 2019-12-10 | 2019-12-10 | Protective circuit for preventing contact adhesion of contactor |
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| CN (1) | CN211555707U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112543536A (en) * | 2020-12-14 | 2021-03-23 | 上海大学 | Automatic closing device and method for classroom lighting facilities |
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2019
- 2019-12-10 CN CN201922200762.7U patent/CN211555707U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112543536A (en) * | 2020-12-14 | 2021-03-23 | 上海大学 | Automatic closing device and method for classroom lighting facilities |
| CN112543536B (en) * | 2020-12-14 | 2022-02-11 | 上海大学 | Automatic closing device and method for classroom lighting facilities |
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