A low-voltage motor restart tester

Abstract

The utility model discloses a low -voltage motor restarts ware test device belongs to motor restarts test technical field, including series connection stop button, start button and first time relay coil, in the circuit section of start button and first time relay coil connection low -voltage motor restarts ware, first intermediate relay coil and second intermediate relay coil are connected in parallel in proper order, first time relay coil parallelly connected contactor coil, the first contactor normally open contact of contactor coil series connection and start button parallelly connected, first contactor normally open contact parallelly connected first intermediate relay normally open contact, first intermediate relay coil series connection low -voltage motor restarts ware start normally open contact, the utility model discloses can detect the soundness of restart ware in time in the motor outage or overhaul, guarantees the normal use of restart ware.

Description

Technical Field

[0001] This utility model relates to the field of motor restart test technology, specifically to a test device for a low-voltage motor restarter. Background Technology

[0002] In industrial production, "voltage dips" refer to a significant drop in voltage or a brief interruption of voltage for several seconds caused by faults such as lightning strikes or short circuits in the power grid, resulting in the malfunction of electrical equipment. Since low-voltage motors often operate using AC contactors, voltage dips frequently cause many important low-voltage motors to shut down in industrial production. The shutdown of critical units can then lead to interlocked shutdowns of large units or even the entire production line, forcing the interruption of continuous production and emergency shutdowns of the production facility, causing significant economic losses to enterprises. In some cases, it can even lead to serious accidents such as fires and explosions.

[0003] Low-voltage motor restarters can effectively solve various shutdown problems caused by power fluctuations and enable the motor to start automatically after a power fluctuation. However, there is currently no device specifically designed to test the integrity of low-voltage motor restarters during inspection or routine maintenance, which affects their normal use. Utility Model Content

[0004] The main purpose of this utility model is to solve the above-mentioned technical problems to a certain extent, and to propose a low-voltage motor restarter test device that can detect the integrity of the restarter at any time during motor shutdown or maintenance, and ensure the normal use of the restarter.

[0005] The main tests focus on the restarter signal output and action time to verify that the device is in good working order.

[0006] The above-mentioned problems to be solved by this utility model are achieved through the following technical solution: A low-voltage motor restarter test device is proposed, including a neutral wire terminal and a live wire terminal of the power supply, and a stop button, a start button and a first time relay coil are connected in series in the circuit segment of the power supply. In the circuit segment connected to the start button and the first time relay coil, a low-voltage motor restarter, a first intermediate relay coil and a second intermediate relay coil are connected in parallel in sequence. The first time relay coil is connected in parallel to a contactor coil. The normally open contact of the first contactor, which is connected in series with the contactor coil, is connected in parallel with the start button. The normally open contact of the first contactor is connected in parallel with the normally open contact of the first intermediate relay. The normally open contact of the first intermediate relay is connected in series with the starting normally open contact of the low-voltage motor restarter. The normally closed normally open contact of the time relay and the normally closed normally open normally open contact of the time relay are connected in series in the second intermediate relay coil.

[0007] In some embodiments, the circuit segment connecting the first time relay coil and the start button is connected in series with the normally closed contact of the first intermediate relay, and the circuit segment connecting the start button and the stop button is connected in series with the normally closed contact of the second intermediate relay.

[0008] In some embodiments, the normally open contact of the low-voltage motor restarter is connected in parallel to the normally open contact of the second intermediate relay.

[0009] In some embodiments, the low-voltage motor restarter is connected in series with the normally closed contact of a third intermediate relay.

[0010] In some embodiments, the second intermediate relay coil is connected in parallel to the second time relay coil, and the normally open contact of the third intermediate relay, which is connected in series with the second time relay coil, is connected in parallel to the normally open contact of the time relay with a delayed closing.

[0011] In some embodiments, a miniature circuit breaker is connected in series at the live wire end.

[0012] The technical solution provided in this application has the following advantages compared with the prior art:

[0013] This invention verifies the device's integrity by detecting the restarter's signal output and action time. It can also check the restarter's integrity at any time during motor shutdown or maintenance, reducing unplanned power outages, lowering costs, minimizing losses, and improving economic efficiency for businesses. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is the control principle diagram of the practical low-voltage motor restarter test device;

[0016] Figure 2 This is the wiring diagram of the practical low-voltage motor restarter test device.

[0017] Explanation of icon numbers:

[0018] 1-Miniature circuit breaker; 2-Stop button; 3-Start button; 4-First time relay coil; 5-First intermediate relay normally closed contact; 6-Second intermediate relay normally closed contact; 7-Low-voltage motor restarter; 8-First intermediate relay coil; 9-Second intermediate relay coil; 10-Contactor coil; 11-First contactor normally open contact; 12-First intermediate relay normally open contact; 13-Low-voltage motor restarter starting normally open contact; 14-Second intermediate relay normally open contact; 15-Time relay delayed closing normally open contact; 16-Time relay delayed opening normally closed contact; 17-Second time relay coil; 18-Third intermediate relay normally open contact; 19-Third intermediate relay normally closed contact; 20-Second contactor normally open contact. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] like Figure 1-2As shown, this utility model proposes a low-voltage motor restarter test device, including a neutral wire terminal and a live wire terminal of the power supply. A miniature circuit breaker 1 is connected in series at the live wire terminal, and a stop button 2, a start button 3, and a first time relay coil 4 are connected in series in its circuit segment. The circuit segment connecting the first time relay coil 4 and the start button 3 is connected in series with a first intermediate relay normally closed contact 5. The circuit segment connecting the start button 3 and the stop button 2 is connected in series with a second intermediate relay normally closed contact 6. In the circuit segment connecting the start button 3 and the first time relay coil 4, a low-voltage motor restarter 7, a first intermediate relay coil 8, and a second intermediate relay coil 9 are connected in parallel in sequence. The first time relay coil 4 is connected in parallel with a contactor coil 10. The contactor coil 10 is connected in series with a first... The normally open contact 11 of the first contactor is connected in parallel with the start button 3. The normally open contact 11 of the first contactor is connected in parallel with the normally open contact 12 of the first intermediate relay. The coil 8 of the first intermediate relay is connected in series with the normally open contact 13 of the low-voltage motor restarter. The normally open contact 13 of the low-voltage motor restarter is connected in parallel with the normally open contact 14 of the second intermediate relay. The coil 9 of the second intermediate relay is connected in series with the normally open contact 15 of the time relay delay closing and the normally closed contact 16 of the time relay delay opening. The coil 9 of the second intermediate relay is connected in parallel with the coil 17 of the second time relay. The normally open contact 18 of the third intermediate relay, which is connected in series with the normally open contact 15 of the time relay delay closing, is connected in parallel with the normally open contact 15 of the time relay. The normally closed contact 19 of the third intermediate relay is connected in series with the low-voltage motor restarter 7.

[0023] The specific operation of this device is as follows:

[0024] First, insert the low-voltage motor restarter 7 into the test base, close the miniature circuit breaker 1 to connect the AC 220V power supply, so that the low-voltage motor restarter 7 is powered on. After pressing the start button 3, the contactor coil 10 is energized, the normally open contact 11 of the first contactor closes and self-locks, and the normally open contact 20 of the second contactor closes to the running state of the low-voltage motor restarter 7.

[0025] Simultaneously, the first time relay coil 4 is energized, the time relay delayed closing normally open contact 15 closes, the second intermediate relay coil 9 is energized, causing the third relay normally open contact to close and self-lock, the second relay normally closed contact to open, the contactor coil 10 is de-energized, and the second relay normally closed contact to open, the low-voltage motor restarter 7 is de-energized; at the same time, the second time relay coil 17 is de-energized, the time relay delayed opening normally closed contact 16 opens, cutting off the power supply to the second time relay coil 17.

[0026] At this time, the low-voltage motor restarter 7 detects that the system is without pressure, and the normally open contact 20 of the second contactor loses its operating status to the low-voltage motor restarter 7, indicating that the motor has lost pressure.

[0027] When the normally open contact of the low-voltage motor restarter 7 closes, the coil of the first intermediate relay 8 is energized, the normally open contact of the second relay closes for self-locking, the normally open contact of the first relay closes, the contactor coil 10 is energized, and the motor restarts successfully.

[0028] Finally, press the stop button 2 to de-energize the control circuit and complete the test. Replace the low-voltage motor restarter and press the start button 3 again to begin a new round of testing.

[0029] This implementation verifies the device's integrity by detecting the restarter's signal output and operating time. It also allows for real-time monitoring of the restarter's integrity during motor shutdowns or maintenance, reducing unplanned power outages, lowering costs, minimizing losses, and improving economic efficiency for businesses.

[0030] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A test device for a low-voltage motor restarter, characterized in that, It includes the neutral and live wires of the power supply, and the stop button, start button and first time relay coil are connected in series in its circuit segment; In the circuit segment connecting the start button and the first time relay coil, a low-voltage motor restarter, a first intermediate relay coil, and a second intermediate relay coil are connected in parallel in sequence. The first time relay coil is connected in parallel to a contactor coil. The normally open contact of the first contactor, which is connected in series with the contactor coil, is connected in parallel to the start button. The normally open contact of the first contactor is connected in parallel to the normally open contact of the first intermediate relay. The first intermediate relay coil is connected in series to the normally open contact of the low-voltage motor restarter, and the second intermediate relay coil is connected in series to the normally open contact of the time relay with a time delay closing and the normally closed contact of the time relay with a time delay opening.

2. The low-voltage motor restarter test apparatus according to claim 1, characterized in that, The circuit segment connecting the first time relay coil and the start button is connected in series with the normally closed contact of the first intermediate relay, and the circuit segment connecting the start button and the stop button is connected in series with the normally closed contact of the second intermediate relay.

3. The low-voltage motor restarter test apparatus according to claim 1, characterized in that, The normally open contact of the low-voltage motor restarter is connected in parallel to the normally open contact of the second intermediate relay.

4. The low-voltage motor restarter test apparatus according to claim 1, characterized in that, The low-voltage motor restarter is connected in series with the normally closed contact of the third intermediate relay.

5. The low-voltage motor restarter test apparatus according to claim 1, characterized in that, The second intermediate relay coil is connected in parallel to the second time relay coil, and the normally open contact of the third intermediate relay, which is connected in series with the second time relay coil, is connected in parallel to the normally open contact of the time relay with a delayed closing.

6. The low-voltage motor restarter test apparatus according to claim 1, characterized in that, A miniature circuit breaker is connected in series at the live wire end.

Images