A self-reset restart circuit for frequency converter

Abstract

The invention discloses a frequency converter self-reset restart circuit, wherein a first time relay is connected to a positive power supply and a negative power supply respectively; one end of a normally open contact of the first time relay is connected to the positive power supply, and the other end is connected to the normally closed contact of the first relay and the second time relay and the negative power supply in sequence; the first normally open contact of the first relay is connected in parallel with the normally open contact of the first time relay, one end of the second normally open contact of the relay is connected to the positive power supply, and the other end is connected to the second time relay and the negative power supply in sequence; one end of a normally open contact of the second time relay is connected to the positive power supply, and the other end is connected to the normally closed contact of the second relay, the first time relay and the negative power supply in sequence, and the normally open contact of the second relay is connected in parallel with the normally open contact of the second time relay. The invention can realize self-reset and complete restart after a false alarm is generated by power grid fluctuations in the frequency converter, so as to ensure that the frequency converter control object can continue to work.

Description

Technical Field

[0001] The invention relates to the field of variable frequency controllers for liquid supply pump motors, and in particular to a frequency converter self-resetting and restarting circuit. Background Art

[0002] During the production of electrolytic copper foil, the electrolytic clean liquid pump and the dirty liquid pump need to supply liquid 24 hours a day. During the liquid supply process, power grid fluctuations or signal disturbances will cause the inverter to falsely alarm and lock, causing the clean liquid pump or the dirty liquid pump to shut down. If the clean liquid pump stops, the raw foil machine will stop supplying liquid and shut down, and the copper foil produced will be scrapped because the number of meters is not enough to meet customer demand. In addition, if the dirty liquid pump stops, the diatomaceous earth in the diatomaceous earth filter will collapse. At this time, to resume production, it is necessary to restart the dirty liquid pump, let the liquid of the diatomaceous earth filter circulate, and re-establish the filter cake layer for the filter, so the production will be interrupted for more than 4 hours. In addition, the repeated start-up of the raw foil process will also increase the additional production preparation time. These adverse effects directly or indirectly affect production. Therefore, in order to ensure the stability and continuity of production, it is necessary to solve the problem of fault locking of the inverter due to power grid fluctuations or signal disturbances.

[0003] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0004] In view of the above technical problems in the related art, the present invention proposes a frequency converter self-reset restart circuit, which can solve the above problems.

[0005] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows:

[0006] A frequency converter self-reset restart circuit comprises a first time relay, a first relay, a second time relay and a second relay, wherein one end of the first time relay is connected to the positive pole of a power supply, and the other end of the first time relay is connected to the negative pole of the power supply; one end of the normally open contact of the first time relay is connected to the positive pole of the power supply, and the other end of the normally open contact of the first time relay is connected to the normally closed contacts of the first relay and the second time relay in sequence, and the normally closed contact of the second time relay is connected to the negative pole of the power supply; the first normally open contact of the first relay is connected in parallel to the two ends of the normally open contact of the first time relay, one end of the second normally open contact of the relay is connected to the positive pole of the power supply, and the other end of the second normally open contact of the relay is connected to the second time relay, and the second time relay is connected to the negative pole of the power supply; one end of the normally open contact of the second time relay is connected to the positive pole of the power supply, and the other end of the normally open contact of the second time relay is connected to the normally closed contacts of the second relay and the first time relay in sequence, the normally closed contact of the first time relay is connected to the negative pole of the power supply, and the normally open contact of the second relay is connected in parallel to the two ends of the normally open contact of the second time relay.

[0007] Furthermore, a fault signal sensing switch is connected between one end of the first time relay and the positive electrode of the power supply.

[0008] Furthermore, the first time relay and the second time relay are set to have the same duration.

[0009] Beneficial effects of the present invention: The present invention is provided with a first time relay, a first relay, a second time relay and a second relay. By adding this circuit to the inverter control circuit, the inverter can be self-reset and restarted after a false alarm is generated due to power grid fluctuations, thereby ensuring that the inverter control object can continue to work. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 The present invention is a schematic diagram of a self-reset and restart circuit for a frequency converter according to an embodiment of the present invention.

[0012] In the figure: 1. first time relay, 1-1. normally open contact of the first time relay, 1-2. normally closed contact of the first time relay, 2. first relay, 2-1. first normally open contact of the first relay, 2-2. second normally open contact of the relay, 3. second time relay, 3-1. normally closed contact of the second time relay, 3-2. normally open contact of the second time relay, 4. second relay, 4-1. normally open contact of the second relay. DETAILED DESCRIPTION

[0013] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0014] like Figure 1As shown, a frequency converter self-reset restart circuit according to an embodiment of the present invention includes a first time relay 1, a first relay 2, a second time relay 3 and a second relay 4, one end of the first time relay 1 is connected to the positive pole of the power supply, and the other end of the first time relay 1 is connected to the negative pole of the power supply; one end of the normally open contact 1-1 of the first time relay is connected to the positive pole of the power supply, and the other end of the normally open contact 1-1 of the first time relay is connected to the normally closed contact 3-1 of the first relay 2 and the second time relay in sequence, and the normally closed contact 3-1 of the second time relay is connected to the negative pole of the power supply; the first normally open contact 2-1 of the first relay is connected in parallel to the first time relay The two ends of the normally open contact 1-1 of the device, one end of the second normally open contact 2-2 of the relay is connected to the positive electrode of the power supply, the other end of the second normally open contact 2-2 of the relay is connected to the second time relay 3, and the second time relay 3 is connected to the negative electrode of the power supply; one end of the normally open contact 3-2 of the second time relay is connected to the positive electrode of the power supply, the other end of the normally open contact 3-2 of the second time relay is connected to the second relay 4 and the normally closed contact 1-2 of the first time relay in sequence, the normally closed contact 1-2 of the first time relay is connected to the negative electrode of the power supply, and the normally open contact 4-1 of the second relay is connected in parallel to the two ends of the normally open contact 3-2 of the second time relay.

[0015] In a specific embodiment of the present invention, a fault signal sensing switch is connected between one end of the first time relay 1 and the positive electrode of the power supply.

[0016] In a specific embodiment of the present invention, the first time relay 1 and the second time relay 3 are set with the same time length.

[0017] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0018] In specific use, according to a frequency converter self-reset and restart circuit of the present invention, when the frequency converter generates a fault signal, the fault signal sensing switch is closed, the first time relay 1 delays the start and resets the frequency converter, and starts the first relay 2 at the same time. If the frequency converter is a false alarm, it is detected that the previous fault has been reset, the first time relay 1 is disconnected, and the normally closed contacts 1-2 of the first time relay are in a closed state. After the first time relay 1 is started, the timing is staggered with the second time relay 3 and the second relay 4 is started. The normally open contact 4-1 of the second relay is self-locked to lock the start signal and complete the self-reset and restart of the frequency converter.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A frequency converter self-reset restart circuit, characterized in that: The invention comprises a first time relay (1), a first relay (2), a second time relay (3) and a second relay (4), wherein one end of the first time relay (1) is connected to the positive pole of a power supply, and the other end of the first time relay (1) is connected to the negative pole of the power supply; one end of a normally open contact (1-1) of the first time relay is connected to the positive pole of the power supply, and the other end of the normally open contact (1-1) of the first time relay is connected to the normally closed contacts (3-1) of the first relay (2) and the second time relay in sequence, and the normally closed contact (3-1) of the second time relay is connected to the negative pole of the power supply; the first normally open contact (2-1) of the first relay is connected in parallel to both ends of the normally open contact (1-1) of the first time relay , one end of the second normally open contact (2-2) of the relay is connected to the positive electrode of the power supply, the other end of the second normally open contact (2-2) of the relay is connected to the second time relay (3), and the second time relay (3) is connected to the negative electrode of the power supply; one end of the normally open contact (3-2) of the second time relay is connected to the positive electrode of the power supply, the other end of the normally open contact (3-2) of the second time relay is connected to the normally closed contact (1-2) of the second relay (4) and the first time relay in sequence, the normally closed contact (1-2) of the first time relay is connected to the negative electrode of the power supply, and the normally open contact (4-1) of the second relay is connected in parallel to both ends of the normally open contact (3-2) of the second time relay; A fault signal sensing switch is connected between one end of the first time relay (1) and the positive electrode of the power supply; When the frequency converter generates a fault signal, the fault signal sensing switch is closed, the first time relay (1) is delayed to start and reset the frequency converter, and the first relay (2) is started at the same time. If the frequency converter is a false alarm, the previous fault has been reset, the first time relay (1) is disconnected, and the normally closed contact (1-2) of the first time relay is in a closed state. After the first time relay (1) is started, the timing is staggered with the second time relay (3) and the second relay (4) is started. The normally open contact (4-1) of the second relay is self-locked to lock the start signal, and the frequency converter is self-reset and restarted.

2. The inverter self-reset restart circuit according to claim 1, characterized in that: The first time relay (1) and the second time relay (3) are set to have the same time length.

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