Control system for soft start of motor in papermaking industry

Abstract

The utility model discloses a control system for soft start of a motor in the papermaking industry, which comprises a soft starter RQ, a terminal 7 and a terminal 10 of the soft starter RQ are in short circuit, a terminal 8 and a terminal 9 of the soft starter RQ are in short circuit, the terminal 8 and the terminal 9 of the soft starter RQ are both connected with one end of a normally open contact of a relay KA, and the other end of the normally open contact of the relay KA is connected with the terminal 7 and the terminal 10; and the terminals L11, L12 and L13 of the soft starter RQ are connected with one end of a contact of a contactor 2KM, and the other end of the contact of the contactor 2KM is connected with a motor M. The soft starter has the following advantages that the motor can continuously operate under the condition that the soft starter misreports a fault, and after the fault is misreported, the motor can still continuously operate and has circuit break protection, so that the condition that components are damaged cannot occur.

Description

TECHNICAL FIELD

[0001] The utility model relates to a control system of motor soft start in papermaking industry belongs to electronic technical field. BACKGROUND

[0002] In papermaking industry, automation level is higher and higher, asynchronous motor is applied more and more widely, but when starting, it will cause large current, influence power supply voltage quality, increase power supply line loss, and at the same time, cause impact to mechanical equipment, and motor soft starter successfully solves this problem.

[0003] Paper machine and part motor need continuous operation, but frequent fault false alarm of motor soft starter will cause motor stop, influence paper quality, and further influence production. CONTENT OF UTILITY MODEL

[0004] The utility model solves technical problem in the above -mentioned, provides a control system of motor soft start in papermaking industry, and motor can continuously run under the condition of false alarm of soft starter, after appearing false alarm, motor still can continuously run and has circuit protection, and will not appear the condition of damaging component.

[0005] In order to solve above technical problem, the utility model adopts following technical scheme:

[0006] A control system of motor soft start in papermaking industry, including soft starter RQ, the terminal 7 and terminal 10 of soft starter RQ are short-circuited, and the terminal 8 and terminal 9 are short-circuited, and the terminal 8 and terminal 9 of soft starter RQ are connected with the one end of relay KA normally open contact, and the other end of relay KA normally open contact is connected with terminal 7 and terminal 10;

[0007] The terminal L11, L12, L13 of soft starter RQ is connected with the one end of contactor 2KM contact, and the other end of contactor 2KM contact is connected with motor M.

[0008] Further, the terminal R, S, T of soft starter RQ is connected with the one end of fuse QS, and the other end of fuse QS is connected with the one end of contactor 1KM contact, and the other end of contactor 1KM contact is connected with the one end of circuit breaker QL, and the other end of circuit breaker QL is connected with power supply L1 line, L2 line and L3 line.

[0009] Further, the terminal 3 and terminal 4 of soft starter RQ are used as fault control point, and the terminal 5 and terminal 6 of soft starter RQ are used as operation control point.

[0010] Furthermore, terminal 1 of the soft starter RQ is connected to one end of the contactor 2KM contact and connected to the live wire L11. The other end of the contactor 2KM contact is connected to one end of the relay KA contact. The other end of the relay KA contact is connected to terminal 2 of the soft starter RQ. Terminal 2 of the soft starter RQ is also connected to one end of the coil of the contactor 2KM. The other end of the coil of the contactor 2KM is connected to the neutral wire N.

[0011] Furthermore, one end of the contactor 2KM contact is connected to the live wire L11, and the other end of the contactor 2KM contact is connected to one end of the indicator light 1HG, and the other end of the indicator light 1HG is connected to the neutral wire N.

[0012] Furthermore, one end of the relay KA coil is connected to one end of the start button switch 1SF, one end of the relay KA contact, and one end of the remote host computer DCS control relay. The other end of the relay KA coil is connected to one end of the normally closed contact of the overload protection relay FR. The other end of the normally closed contact of the overload protection relay FR is connected to the neutral wire N. The other end of the start button switch 1SF and the other end of the relay KA contact are connected to the local control pin of the changeover switch SAC. The other end of the remote host computer DCS control relay is connected to the remote control pin of the changeover switch SAC. Pins 4 and 2 of the changeover switch SAC are connected to the live wire L11.

[0013] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0014] The motor can continue to run even if the soft starter falsely reports a fault. After a false fault occurs, the motor can still continue to run and has circuit breaker protection, so there will be no damage to the components. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is the electrical schematic diagram of the control system in this utility model. Detailed Implementation

[0017] Example 1, as Figure 1 As shown, a control system for soft starting a motor in the papermaking industry includes a soft starter RQ. Terminals 7 and 10 of the soft starter RQ are shorted together, and terminals 8 and 9 are shorted together. Terminals 8 and 9 of the soft starter RQ are each connected to one end of a normally open contact of a relay KA. The other end of the normally open contact of the relay KA is connected to terminals 7 and 10.

[0018] The terminal 3 and the terminal 4 of the soft starter RQ are taken as the fault control points, and the terminal 5 and the terminal 6 of the soft starter RQ are taken as the operation control points.

[0019] One end of a fuse QS is connected to the terminals R, S and T of the soft starter RQ, and the other end of the fuse QS is connected to one end of the contactor 1KM contact, and the other end of the contactor 1KM contact is connected to one end of the circuit breaker QL, and the other end of the circuit breaker QL is connected to the power supply L1 line, the L2 line and the L3 line.

[0020] The terminals L11, L12 and L13 of the soft starter RQ are connected to one end of the contactor 2KM contact, and the other end of the contactor 2KM contact is connected to the motor M.

[0021] One end of the contactor 2KM contact is connected to the terminal 1 of the soft starter RQ and the firewire L11, and the other end of the contactor 2KM contact is connected to one end of the relay KA contact, and the other end of the relay KA contact is connected to the terminal 2 of the soft starter RQ, and one end of the coil of the contactor 2KM is also connected to the terminal 2 of the soft starter RQ, and the other end of the coil of the contactor 2KM is connected to the zero line N.

[0022] The two ends of the coil of the contactor 1KM are connected to the firewire L11 and the zero line N respectively.

[0023] One end of the contactor 2KM contact is connected to the firewire L11, and the other end of the contactor 2KM contact is connected to one end of the indicator lamp 1HG, and the other end of the indicator lamp 1HG is connected to the zero line N.

[0024] One end of the coil of the relay KA is connected to one end of the start button switch 1SF, one end of the relay KA contact and one end of the remote host computer DCS control relay, and the other end of the coil of the relay KA is connected to one end of the normally closed contact of the overload protection relay FR, and the other end of the normally closed contact of the overload protection relay FR is connected to the zero line N, and the other end of the start button switch 1SF and the other end of the relay KA contact are connected to the local control foot of the change-over switch SAC, and the other end of the remote host computer DCS control relay is connected to the remote control foot of the change-over switch SAC, and the 4 foot and the 2 foot of the change-over switch SAC are connected to the firewire L11. This part of the control circuit realizes the remote (host computer DCS control) / local control function of the soft starter through the selection of the remote / local control change-over switch change-over switch SAC, and in the local control mode, it is realized through the self-locking of the relay KA after starting, and in the remote control mode, it is realized through the start command of the host computer to make the DCS start relay KA closed.

[0025] In order to realize the soft start, the upper terminals 7 and 10 of the soft starter are short-circuited, and the terminals 8 and 9 are short-circuited (two-wire start). After starting, the two groups of terminals are connected through the closure of the normally open contact of the relay KA, so as to realize the soft start. At this time, the soft start terminals 1 and 2 are internally conducted, and the coil of the 2KM is powered.

[0026] Soft start after the soft start terminal 1 and 2 disconnect, 2KM coil power off, contactor is disconnected. The device stops running, in order to ensure that the soft start device still continues normal operation after failure, need to 2KM self-locking, using the normally open auxiliary contact of the contactor, when the contactor coil is energized, its auxiliary contact is closed, thereby making the contactor remain in the state of suction. At the same time, the normally open contact of KA is connected in series in the self-locking loop. Ensure that the bypass contactor is normally sucked after the soft start failure. The starting relay can normally stop when it is connected in series with KA during normal shutdown.

[0027] The description of the utility model is given for example and description, and is not exhaustive or limit the utility model to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The selection and description of embodiments are to better illustrate the principles and practical application of the utility model, and enable those skilled in the art to understand the utility model so as to design various embodiments with various modifications suitable for specific purposes.

Claims

1. A control system for soft starting of an electric machine in the paper industry, characterized in that The soft starter RQ has its terminals 7 and 10 short-circuited, and its terminals 8 and 9 short-circuited, and each of the terminals 8 and 9 of the soft starter RQ is connected with one end of the normally open contact of the relay KA, and the other end of the normally open contact of the relay KA is connected with the terminals 7 and 10. The terminals L11, L12 and L13 of the soft starter RQ are connected with one end of the contactor 2KM, and the other end of the contactor 2KM is connected with the motor M.

2. A control system for soft starting of an electric machine in a paper industry as claimed in claim 1 characterized in that: The terminals R, S and T of the soft starter RQ are connected with one end of the fuse QS, and the other end of the fuse QS is connected with one end of the contactor 1KM, and the other end of the contactor 1KM is connected with one end of the circuit breaker QL, and the other end of the circuit breaker QL is connected with the power supply lines L1, L2 and L3.

3. A control system for soft starting of an electric machine in a paper industry as claimed in claim 1, characterized in that: The terminals 3 and 4 of the soft starter RQ are used as the fault control points, and the terminals 5 and 6 of the soft starter RQ are used as the operation control points.

4. A control system for soft starting of an electric machine in a paper industry as claimed in claim 1, characterized in that: The terminal 1 of the soft starter RQ is connected with one end of the contactor 2KM, and is connected with the fire wire L11, and the other end of the contactor 2KM is connected with one end of the contact of the relay KA, and the other end of the contact of the relay KA is connected with the terminal 2 of the soft starter RQ, and the terminal 2 of the soft starter RQ is further connected with one end of the coil of the contactor 2KM, and the other end of the coil of the contactor 2KM is connected with the zero wire N.

5. A control system for soft starting of an electric machine in a paper industry as claimed in claim 1, characterized in that: The contactor 2KM is connected with the fire wire L11, and the other end of the contactor 2KM is connected with one end of the indicator light 1HG, and the other end of the indicator light 1HG is connected with the zero wire N.

6. A control system for soft starting of an electric machine in a paper industry as claimed in claim 1, characterized in that: The coil of the relay KA is connected with one end of the start button switch 1SF, one end of the contact of the relay KA and one end of the remote host computer DCS control relay, and the other end of the coil of the relay KA is connected with one end of the normally closed contact of the overload protection relay FR, and the other end of the normally closed contact of the overload protection relay FR is connected with the zero wire N, and the other end of the start button switch 1SF and the other end of the contact of the relay KA are connected with the local control foot of the change-over switch SAC, and the other end of the remote host computer DCS control relay is connected with the remote control foot of the change-over switch SAC, and the 4 foot and the 2 foot of the change-over switch SAC are connected with the fire wire L11.

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