CN211880319U - Control device for switching motor from frequency conversion to power frequency state - Google Patents
Control device for switching motor from frequency conversion to power frequency state Download PDFInfo
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- CN211880319U CN211880319U CN202020474366.3U CN202020474366U CN211880319U CN 211880319 U CN211880319 U CN 211880319U CN 202020474366 U CN202020474366 U CN 202020474366U CN 211880319 U CN211880319 U CN 211880319U
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Abstract
The utility model discloses a controlling means under motor is switched to the power frequency state by the frequency conversion, and the output of converter passes through alternating current contactor KM1 normally open contact and is connected with the motor and forms frequency conversion return circuit. The input end of the motor forms a loop by connecting a normally open contact of a time relay KT. The input of the motor is connected to the power grid through an alternating current contactor KM2 and an air switch QF 1. The control circuit is composed of an air switch QF2, a remote control button and an alternating current contactor. The utility model discloses an install the consumption return circuit of an induced electromotive force additional, avoid the impact to the municipal power grids, break away from the restriction of electric wire netting capacity to the motor, guarantee production technology's continuity. The utility model discloses guaranteed that the running state of motor can be switched to the power frequency by the frequency conversion in very short time, the too big impact to the city electric wire netting that causes of electric current when avoiding motor power frequency to start breaks away from the restriction that electric wire netting capacity started to the motor power frequency, guarantees the continuity of production technology.
Description
Technical Field
The utility model relates to an electric device remote control technical field especially relates to a controlling means of motor under switching to power frequency state by the frequency conversion.
Background
With the rapid development of the industry, industrial control systems are mature day by day, frequency converters are widely applied to various industrial control systems, and particularly in some industries with higher production process performance, the frequency converters have higher requirements on continuous starting of motors and have smaller fluctuation impact on power grids. The load starting of the frequency converter is the mainstream trend of the current industrial control industry, and the sudden power failure of the motor is not allowed in order to ensure the process continuity.
Most of the solutions adopt power frequency standby, and once a main circuit of the system is in a problem or a frequency converter has a fault to alarm, the DCS system is directly switched to a power frequency state. The motor can produce very big impulse current when directly switching to the power frequency running state by the frequency conversion running state, and motor inside has certain induced electromotive force can increase the impact to the city electric wire netting, has certain potential safety hazard to circuit system, appears the unable normal work of large tracts of land equipment even.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is exactly in order to remedy prior art's defect, provides a controlling means that the motor is switched to under the power frequency state by the frequency conversion to a series of problems that appear in the effectual frequency conversion of avoiding switches to the power frequency state process, the too big impact that causes the municipal power grid of electric current when avoiding the start-up of motor power frequency breaks away from the restriction that electric wire netting capacity started to the motor power frequency, guarantees the continuity of production technology.
The utility model discloses a realize through following technical scheme:
a control device for switching a motor from a variable frequency state to a power frequency state comprises a frequency converter UF, a motor 3M, an alternating current contactor KM1, an alternating current contactor KM2, a time relay KT and a control loop;
the input end of the frequency converter UF is connected with a power grid through an air switch QF1, and the output end of the frequency converter UF is connected with a motor 3M through a normally open contact of an alternating current contactor KM1 to form a frequency conversion loop;
the input end of the motor forms a loop by being connected with a normally open contact of a time relay KT;
the input end of the motor is connected to a power grid through a normally open contact of an alternating current contactor KM2 and an air switch QF 1;
the control loop comprises an air switch QF2, a remote control button SB2, a remote control button SB3, an alternating current contactor KM1 and an alternating current contactor KM2, the alternating current contactor KM1 and the alternating current contactor KM2 are provided with interlocking and self-locking protection, the interlocking and self-locking protection are respectively connected to the output end of the air switch QF2 through the remote control button SB2 and the remote control button SB3, and the input end of the QF2 is connected to a power grid.
The specific mode of interlocking and self-locking protection of the alternating current contactor KM1 and the alternating current contactor KM2 is as follows: a coil of the alternating current contactor KM1 is respectively connected with a normally closed contact of a remote control button SB2 and a normally closed contact of an alternating current contactor KM2, and a normally open contact of the alternating current contactor KM1 is connected with the remote control button SB2 in parallel; the coil of the alternating current contactor KM2 is respectively connected with the normally closed contacts of the remote control button SB3 and the alternating current contactor KM1, and the normally open contact of the alternating current contactor KM2 is connected with the remote control button SB3 in parallel.
The coil of the time relay KT is connected with the normally closed contact of the alternating current contactor KM1, and the normally closed contact of the time relay KT is connected between the coil of the alternating current contactor KM2 and the remote control button SB 3.
The remote control button SB2 and the remote control button SB3 are both connected to the power grid through the emergency stop button SB 1.
The utility model has the advantages that: the utility model avoids the impact on the city power grid by additionally arranging a consumption loop of induced electromotive force, gets rid of the restriction of the power grid capacity on the motor, and ensures the continuity of the production process; the utility model discloses guaranteed that the running state of motor can be switched to the power frequency by the frequency conversion in very short time, the too big impact to the city electric wire netting that causes of electric current when avoiding motor power frequency to start breaks away from the restriction that electric wire netting capacity started to the motor power frequency, guarantees the continuity of production technology.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
As shown in fig. 1, a control device for switching a motor from a variable frequency state to a power frequency state comprises three-phase alternating-current power supplies L1, L2 and L3, a variable-frequency controller UF, a motor 3M, alternating-current contactors KM1 and KM2 and a time relay KT. The input end of the frequency converter UF is connected with a power grid through an air switch QF1, and the output end of the frequency converter UF is connected with the motor 3M through a normally-open contact of an alternating current contactor KM1 to form a first loop. And the input end of the motor 3M forms a second loop by being connected with a normally open contact of the time relay KT. The input end of the motor 3M is connected to the power grid through an alternating current contactor KM2 and an air switch QF1 to form a loop III. The control loop is composed of an air switch QF2, remote control buttons SB2 and SB3, and alternating current contactors KM1 and KM 2.
In the control circuit, an alternating current contactor KM1 and an alternating current contactor KM2 are provided with interlocking and self-locking protection, and are respectively connected to the output end of an air switch QF2 through remote control buttons SB2 and SB3, and the input end of QF2 is connected to a power grid.
And a time relay KT in the control loop is connected with a normally closed contact of an alternating current contactor KM1 and is connected into a power grid.
In the control loop, remote control buttons SB2, SB3 are connected to the power grid through an emergency stop button SB 1.
The utility model discloses among the specific implementation, the converter passes through air switch QF1 and introduces three-phase alternating current, L1, L2, L3 to the electric wire netting. And when the DCS remote control system is switched on the SB2, the normally open contact of the main circuit KM1 is switched on, and the first loop works normally.
When the main circuit of the system has a problem or the frequency converter has a fault and gives an alarm, the first loop stops working. And the SB3 is closed by the DCS remote control system, the loop II works, the induced electromotive force in the motor is released, and the motor is protected.
And (4) finishing the delay time of the time relay, working the loop III and operating the motor at power frequency.
The utility model discloses prevent that the frequency conversion from switching the power frequency in the twinkling of an eye, the inside electromotive force of motor has certain impact to the electric wire netting, breaks away from the restriction that electric wire netting capacity started to the motor power frequency. And a second loop is added to quickly release the residual induced electromotive force when the motor operates in a variable frequency mode, so that the safety of the circuit is protected.
The utility model is suitable for a fan water pump, draught fan, occasions such as circulating pump, motor power frequency do not have any electromotive force to disturb when switching with the frequency conversion, reduce the impact to the electric wire netting, improve the technological stability of product.
The technical scheme of the utility model combine the attached drawing to describe the utility model on it, the utility model discloses concrete realization is not restricted by above-mentioned mode, as long as adopt the utility model discloses a method design and technical aspect carry out insubstantial modification, all are in the utility model discloses a protection scope and so on.
Claims (4)
1. The utility model provides a control device that motor switched to under power frequency state by frequency conversion which characterized in that: the system comprises a frequency converter UF, a motor 3M, an alternating current contactor KM1, an alternating current contactor KM2, a time relay KT and a control loop;
the input end of the frequency converter UF is connected with a power grid through an air switch QF1, and the output end of the frequency converter UF is connected with a motor 3M through a normally open contact of an alternating current contactor KM1 to form a frequency conversion loop;
the input end of the motor forms a loop by being connected with a normally open contact of a time relay KT;
the input end of the motor is connected to a power grid through a normally open contact of an alternating current contactor KM2 and an air switch QF 1;
the control loop comprises an air switch QF2, a remote control button SB2, a remote control button SB3, an alternating current contactor KM1 and an alternating current contactor KM2, the alternating current contactor KM1 and the alternating current contactor KM2 are provided with interlocking and self-locking protection, the interlocking and self-locking protection are respectively connected to the output end of the air switch QF2 through the remote control button SB2 and the remote control button SB3, and the input end of the QF2 is connected to a power grid.
2. The control device for switching the motor from the variable frequency state to the power frequency state according to claim 1, characterized in that: the specific mode of interlocking and self-locking protection of the alternating current contactor KM1 and the alternating current contactor KM2 is as follows: a coil of the alternating current contactor KM1 is respectively connected with a normally closed contact of a remote control button SB2 and a normally closed contact of an alternating current contactor KM2, and a normally open contact of the alternating current contactor KM1 is connected with the remote control button SB2 in parallel; the coil of the alternating current contactor KM2 is respectively connected with the normally closed contacts of the remote control button SB3 and the alternating current contactor KM1, and the normally open contact of the alternating current contactor KM2 is connected with the remote control button SB3 in parallel.
3. The control device for switching the motor from the variable frequency state to the power frequency state according to claim 2, characterized in that: the coil of the time relay KT is connected with the normally closed contact of the alternating current contactor KM1, and the normally closed contact of the time relay KT is connected between the coil of the alternating current contactor KM2 and the remote control button SB 3.
4. The control device for switching the motor from the variable frequency state to the power frequency state according to claim 1, characterized in that: the remote control button SB2 and the remote control button SB3 are both connected to the power grid through the emergency stop button SB 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020474366.3U CN211880319U (en) | 2020-04-03 | 2020-04-03 | Control device for switching motor from frequency conversion to power frequency state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020474366.3U CN211880319U (en) | 2020-04-03 | 2020-04-03 | Control device for switching motor from frequency conversion to power frequency state |
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| Publication Number | Publication Date |
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| CN211880319U true CN211880319U (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020474366.3U Active CN211880319U (en) | 2020-04-03 | 2020-04-03 | Control device for switching motor from frequency conversion to power frequency state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114289168A (en) * | 2021-12-29 | 2022-04-08 | 内蒙古超牌新材料股份有限公司 | Depolymerizing machine system and starting method thereof |
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2020
- 2020-04-03 CN CN202020474366.3U patent/CN211880319U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114289168A (en) * | 2021-12-29 | 2022-04-08 | 内蒙古超牌新材料股份有限公司 | Depolymerizing machine system and starting method thereof |
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