CN-224218280-U - Low-voltage variable-frequency control cabinet circuit capable of automatically switching faults

CN224218280UCN 224218280 UCN224218280 UCN 224218280UCN-224218280-U

Abstract

A low-voltage variable frequency control cabinet circuit capable of automatically switching faults is characterized in that one end of a change-over switch SA1 is connected with an input end, the other end of the change-over switch SA1 is respectively provided with a conducting end of a contactor KA3, a conducting end of a contactor KA6 and a conducting end of an intermediate relay KT, the conducting end of the contactor KA3 is connected with a coil end of the intermediate relay KT, the conducting end of the intermediate relay KT is connected with the coil end of the intermediate relay KA, a switch SF1 is also connected with the coil end of the intermediate relay KA1, the conducting end of the intermediate relay KA1 is connected with a control end of a first frequency converter, one end of a change-over switch SA2 is connected with the input end, the conducting end of the intermediate relay KA4 is connected with a control end of a second frequency converter, one end of the intermediate relay KA is connected with the change-over switch SA2, the other end of the intermediate relay KA is connected with the coil end of the intermediate relay KA4, and the other end of the intermediate relay KA is connected with the coil end of the intermediate relay KA 1.

Inventors

LI WENTING
ZOU WENBIN
QIU JUNFU
JIANG LEI
SONG WEI

Assignees

江西泰豪智能电力科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250530

Claims (4)

1. The low-voltage variable frequency control cabinet circuit is characterized by comprising a change-over switch SA1 and a change-over switch SA2, wherein one end of the change-over switch SA1 is connected with an input end, the other end of the change-over switch SA1 is respectively provided with a conducting end of a contactor KA3, a conducting end of a contactor KA6 and a conducting end of an intermediate relay KT, the conducting end of the contactor KA3 and the conducting end of the contactor KA6 are connected together and then are connected with a coil end of the intermediate relay KT, the conducting end of the intermediate relay KT is connected with the coil end of the intermediate relay KA, the other end of the change-over switch SA1 is sequentially provided with a switch SS1 and a switch SF1, and the conducting end of the intermediate relay KA1 is connected with a control end of a first frequency converter; One end of the change-over switch SA2 is connected with the input end, the other end is provided with a switch SS2 and a switch SF2 in sequence, the switch SF2 is connected with a coil end of the intermediate relay KA4, a conducting end of the intermediate relay KA4 is connected with a control end of the second frequency converter, one end of the conducting end of the intermediate relay KA is connected with the change-over switch SA2, the other end of the intermediate relay KA is connected with a coil end of the intermediate relay KA4, one end of the conducting end of the intermediate relay KA is connected with the change-over switch SA1, and the other end of the intermediate relay KA1 is connected with a coil end of the intermediate relay KA 1.
2. The circuit of claim 1, further comprising a receiving unit 1AT connected to the input end for receiving the fault signal of the first inverter, wherein the receiving unit 1AT is respectively connected with an indicator lamp HR1 and an indicator lamp HY1.
3. The automatic switching low-voltage inverter control cabinet circuit according to claim 2, further comprising a receiving unit 2AT connected with the input end for receiving the fault signal of the second inverter, wherein the receiving unit 2AT is respectively connected with an indicator lamp HR2 and an indicator lamp HY2.
4. The low-voltage variable frequency control cabinet circuit capable of automatically switching over according to claim 1, wherein the input end is respectively connected with an indicator lamp HW, an indicator lamp HW1 and an indicator lamp HW2.

Description

Low-voltage variable-frequency control cabinet circuit capable of automatically switching faults Technical Field The utility model relates to the field of variable frequency cabinets, in particular to a low-voltage variable frequency control cabinet circuit capable of automatically switching faults. Background The current frequency converter control loop scheme is only a single frequency converter loop, the functions of manual and automatic switching and remote control starting are realized, and a second frequency converter loop is not used as a standby frequency converter loop after the failure of the main frequency converter. The existing frequency converter control loop lacks fault tolerance rate of frequency converter fault, and when the frequency converter controlling motor operation breaks down, the whole motor loop loses working capacity, and working efficiency is affected. Disclosure of utility model In order to solve the problems, the technical scheme provides a low-voltage variable frequency control cabinet circuit capable of automatically switching faults. In order to achieve the above purpose, the technical scheme is as follows: The low-voltage variable frequency control cabinet circuit capable of automatically switching faults comprises a change-over switch SA1 and a change-over switch SA2, wherein one end of the change-over switch SA1 is connected with an input end, the other end of the change-over switch SA1 is respectively provided with a conducting end of a contactor KA3, a conducting end of a contactor KA6 and a conducting end of an intermediate relay KT, the conducting end of the contactor KA3 and the conducting end of the contactor KA6 are connected in a common mode and then are connected with a coil end of the intermediate relay KT, the conducting end of the intermediate relay KT is connected with the coil end of the intermediate relay KA, the other end of the change-over switch SA1 is sequentially provided with a switch SS1 and a switch SF1, and the conducting end of the intermediate relay KA1 is connected with a control end of a first frequency converter; One end of the change-over switch SA2 is connected with the input end, the other end is provided with a switch SS2 and a switch SF2 in sequence, the switch SF2 is connected with a coil end of the intermediate relay KA4, a conducting end of the intermediate relay KA4 is connected with a control end of the second frequency converter, one end of the conducting end of the intermediate relay KA is connected with the change-over switch SA2, the other end of the intermediate relay KA is connected with a coil end of the intermediate relay KA4, one end of the conducting end of the intermediate relay KA is connected with the change-over switch SA1, and the other end of the intermediate relay KA1 is connected with a coil end of the intermediate relay KA 1. In some embodiments, the device further comprises a receiving unit 1AT connected with the input end and used for receiving the fault signal of the first frequency converter, and the receiving unit 1AT is respectively connected with an indicator lamp HR1 and an indicator lamp HY1. In some embodiments, the system further comprises a receiving unit 2AT connected with the input end for receiving the fault signal of the second frequency converter, and the receiving unit 2AT is respectively connected with an indicator lamp HR2 and an indicator lamp HY2. In some embodiments, the input terminals are respectively connected with an indicator lamp HW, an indicator lamp HW1 and an indicator lamp HW2. The application has the beneficial effects that: The application adds the (n+1) th frequency converter control loop, namely the standby frequency converter control loop. The fault tolerance rate of work can be greatly improved by using the control scheme of the standby frequency converter, when the control loop of the main frequency converter fails, only the frequency converter with the problem is isolated when the control loop of the standby frequency converter fails, and the control loop of the standby frequency converter can be rapidly put into operation to ensure the normal operation of the motor. The main equipment can run in turn, so that the single equipment is prevented from running at full load for a long time, the abrasion is reduced, and the service life is prolonged. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below. FIG. 1 is a schematic electrical diagram of an embodiment of the present utility model; FIG. 2 is a schematic diagram of a frequency converter according to an embodiment of the present utility model; FIG. 3 is a schematic diagram of control logic of an embodiment of the present utility model. Detailed Description In order to make the technical problems, technical schemes and beneficial effects solved by the