A 15-speed control circuit for frequency converter

Abstract

The present invention discloses a 15-speed control circuit of a frequency converter, comprising a secondary line power port A and a power port B, a forward contactor KM1, a reverse contactor KM2, programming contactors KM3 to KM6, intermediate relays KA1 to KA15, a thermal relay FR, time relays KT1 to KT14, bipolar circuit breakers QF1 and QF2, a forward button SB1, a reverse button SB2, a stop button SB3, a forward indicator light HD1, a reverse indicator light HD2 and a frequency converter VVVF. The purpose of the present invention is to provide a 15-speed control circuit of a frequency converter, wherein the multifunctional programming terminals S1 to S4 of the frequency converter VVVF can be used to set 15 speeds, and the running time of each speed can be set separately. After adopting variable frequency speed control, the mechanical system is simplified, the operation and control are more convenient, and different speed running curves can be set according to the production process, thereby improving the function of the entire equipment.

Description

Technical Field

[0001] The invention relates to a control circuit, in particular to a 15-stage speed control circuit of a frequency converter. Background Art

[0002] In the field of industrial manufacturing, multi-speed means that the motor needs to run at different speeds during operation. The change of motor speed is the change of the inverter output frequency. Therefore, multiple speeds can be set inside the inverter, and the speed can be changed by changing the wiring of its control speed terminal. The inverter multi-speed function, also called fixed speed, uses digital terminals to select a combination of fixed set values ​​to achieve multi-speed operation of the motor. There are two methods of fixed set values, direct selection and binary selection. For example, the spinning machine cannot run too fast at the beginning, otherwise there will be many yarn breaks, and the speed needs to be gradually increased. In the middle period of operation, it can run at high speed. But when it is close to the full yarn stage, it needs to slow down. The entire production speed changes in a curve. Summary of the invention

[0003] The purpose of the present invention is to provide a 15-speed control circuit of a frequency converter. In the multifunctional programming terminals S1 to S4 of the frequency converter VVVF, 16 groups of codes such as 0000, 0001 to 1111 are used to set 15 speeds. The running time of each speed can be set separately. After adopting the variable frequency speed control, the mechanical system is simplified, the operation and control are more convenient, and different speed running curves can be set according to the production process, thereby improving the function of the entire equipment.

[0004] The specific logical relationships corresponding to the multi-function programming terminals S1 to S4 are as follows:

[0005] S1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 S2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 S3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 S4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Speed 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

[0006] To achieve the above object, the present invention provides a 15-speed control circuit of a frequency converter, comprising a secondary line power port A and a power port B, the control circuit further comprising a forward contactor KM1, a reverse contactor KM2, programming contactors KM3 to KM6, intermediate relays KA1 to KA15, a thermal relay FR, a time relay KT1 to KT14, a bipolar circuit breaker QF1 and QF2, a forward button SB1, a reverse button SB2, a stop button SB3, and a forward indicator light HD1, a reverse indicator light HD2 and a frequency converter VVVF;

[0007] The secondary power supply port A is connected to the upper end of the forward button SB1, the upper end of the forward contactor normally open contact KM1-1, the upper end of the reverse button SB2, the upper end of the reverse contactor normally open contact KM2-1, the upper end of the forward contactor normally open contact KM1-2, and the upper end of the reverse contactor normally open contact KM2-2 through the bipolar circuit breaker QF1 and the stop button SB3;

[0008] The lower end of the forward button SB1 and the lower end of the forward contactor normally open contact KM1-1 are connected in parallel, and after being connected in series with the reverse contactor KM2 normally closed contact, they are respectively connected to the upper end of the forward contactor KM1 coil and the upper end of the forward indicator HD1;

[0009] The lower end of the reverse button SB2 and the lower end of the reverse contactor normally open contact KM2-1 are connected in parallel, and after being connected in series with the normally closed contact of the forward contactor KM1, they are respectively connected to the upper end of the reverse contactor KM2 coil and the upper end of the reverse indicator HD2;

[0010] The lower end of the forward contactor normally open contact KM1-2 and the lower end of the reverse contactor normally open contact KM2-2 are connected in parallel, and are respectively connected in series with the upper end of the normally closed contact of the intermediate relay KA2, the upper end of the delayed closed normally open contact of the time relays KT1 to KT14, the upper end of the normally open contacts of the intermediate relays KA2 to KA15, and the upper ends of the normally open contacts of the intermediate relays KA1, KA3-1, KA5-1, KA7-1, KA9-1, KA11-1, KA13-1, and KA15-1, and the upper ends of the normally open contacts of the intermediate relays KA2-1, KA3-2 , KA6-1, KA7-2, KA10-1, KA11-2, KA14-1, KA15-2 normally open contacts are connected at the upper ends, the intermediate relays KA4-1, KA5-2, KA6-2, KA7-3, KA12-1, KA13-2, KA14-2, KA15-3 normally open contacts are connected at the upper ends, the intermediate relays KA8-1, KA9-2, KA10-2, KA11-3, KA12-2, KA13-3, KA14-3, KA15-4 normally open contacts are connected at the upper ends;

[0011] The lower end of the normally closed contact of the intermediate relay KA2 is connected to the upper end of the coil of the intermediate relay KA1 and the upper end of the coil of the time relay KT1 respectively;

[0012] The time relays KT1 to KT14 delay closing of the lower ends of the normally open contacts, are respectively connected in parallel with the lower ends of the normally open contacts of the intermediate relays KA2 to KA15, and are respectively connected in series with the intermediate relays KA3 to KA15, and are respectively connected to the upper ends of the coils of the intermediate relays KA2 to KA15 and the upper ends of the coils of the time relays KT2 to KT14;

[0013] The lower ends of the normally open contacts of the intermediate relays KA1, KA3-1, KA5-1, KA7-1, KA9-1, KA11-1, KA13-1 and KA15-1 are connected in parallel and connected to the upper end of the coil of the S1 programming contactor KM3;

[0014] The lower ends of the normally open contacts of the intermediate relays KA2-1, KA3-2, KA6-1, KA7-2, KA10-1, KA11-2, KA14-1 and KA15-2 are connected in parallel and connected to the upper end of the coil of the S2 programming contactor KM4;

[0015] The lower ends of the normally open contacts of the intermediate relays KA4-1, KA5-2, KA6-2, KA7-3, KA12-1, KA13-2, KA14-2 and KA15-3 are connected in parallel and connected to the upper end of the coil of the S3 programming contactor KM5;

[0016] The lower ends of the normally open contacts of the intermediate relays KA8-1, KA9-2, KA10-2, KA11-3, KA12-2, KA13-3, KA14-3 and KA15-4 are connected in parallel and connected to the upper end of the coil of the S4 programming contactor KM6;

[0017] The lower end of the forward contactor KM1 coil, the lower end of the forward indicator light HD1, the lower end of the reverse contactor KM2 coil, the lower end of the reverse indicator light HD2, the lower ends of the intermediate relays KA1 to KA15 coils, the lower ends of the time relays KT1 to KT14 coils, and the lower ends of the contactors KM3 to KM6 coils are connected in parallel, and the normally closed contact of the series thermal relay FR is connected to one end of the bipolar circuit breaker QF2;

[0018] The other end of the bipolar circuit breaker QF2 is connected to the secondary line power supply port B;

[0019] The digital common terminal COM of the frequency converter VVVF is connected to the upper ends of the normally open contacts of the programming contactors KM1-3, KM2-3, KM3, KM4, KM5 and KM6 respectively;

[0020] The lower ends of the normally open contacts of the programming contactors KM1-3, KM2-3, KM3, KM4, KM5 and KM6 are respectively connected to the forward input terminal FWD, the reverse input terminal REV and the programming terminals S1 to S4 of the frequency converter VVVF.

[0021] In the above technical scheme, when the 15-speed control circuit of a frequency converter of the present invention is turned on in forward rotation, the bipolar circuit breakers QF1 and QF2 are manually closed first, and then the forward button SB1 is pressed, the coil of the forward contactor KM1 and the forward indicator light HD1 are energized, and the normally open contact KM1-1 of the forward contactor is closed and self-locked. The normally open contact KM1-3 of the forward contactor is closed, and the forward input terminal FWD of the frequency converter VVVF is energized. At the same time, the normally open contact KM1-2 of another forward contactor is closed, and the coils of the 1-speed intermediate relay KA1 and the 1-speed time relay KT1 are energized at the same time. The normally open contact of the 1-speed intermediate relay KA1 is closed, the S1 programming contactor KM3 is energized, the normally open contact of the S1 programming contactor KM3 is closed, the S1 programming terminal of the frequency converter VVVF is energized, and the frequency converter starts to operate at the 1-speed frequency.

[0022] When the delay time of the 1st-speed time relay KT1 is reached, the normally open contact of the time relay KT1 is closed, and the 2nd-speed intermediate relay KA2 and the 2nd-speed time relay KT2 coil are energized at the same time. The normally open contact of the intermediate relay KA2 is closed and self-locked. The normally open contact of the other pair of intermediate relays KA1 is closed, the S2 programming contactor KM4 is energized, the normally open contact of the S2 programming contactor KM4 is closed, the S2 programming terminal of the inverter VVVF is energized, and the inverter starts to operate at the 2nd-speed frequency.

[0023] Similarly, the frequency converter gradually operates from 2-speed frequency to 15-speed frequency, and different speed operation curves can be set according to the production process, thereby improving the function of the entire equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall circuit diagram of the present invention;

[0025] Figure 2 yes Figure 1 Schematic diagram of point A;

[0026] Figure 3 yes Figure 1 Schematic diagram of point B;

[0027] Figure 4 yes Figure 1 Schematic diagram of point C;

[0028] Figure 5 yes Figure 1 Schematic diagram of point D. DETAILED DESCRIPTION

[0029] Due to image size limitations, Figure 1 The circuit of the present invention cannot be fully displayed, so its partial Figure 2 , Figure 3 , Figure 4 , Figure 5 As Figure 1Supplement for the convenience of explanation.

[0030] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is a further detailed description of a 15-speed control circuit of a frequency converter of the present invention in combination with the figures and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Depend on Figure 2 , Figure 3 , Figure 4 , Figure 5 It can be seen that the 15-speed control circuit of a frequency converter of the present embodiment includes a secondary line power port A and a power port B, and the control circuit also includes a forward contactor KM1, a reverse contactor KM2, programming contactors KM3 to KM6, intermediate relays KA1 to KA15, thermal relays FR, time relays KT1 to KT14, bipolar circuit breakers QF1 and QF2, a forward button SB1, a reverse button SB2, a stop button SB3, and a forward indicator light HD1, a reverse indicator light HD2 and a frequency converter VVVF;

[0032] The secondary power supply port A is connected to the upper end of the forward button SB1, the upper end of the forward contactor normally open contact KM1-1, the upper end of the reverse button SB2, the upper end of the reverse contactor normally open contact KM2-1, the upper end of the forward contactor normally open contact KM1-2, and the upper end of the reverse contactor normally open contact KM2-2 through the bipolar circuit breaker QF1 and the stop button SB3;

[0033] The lower end of the forward button SB1 and the lower end of the forward contactor normally open contact KM1-1 are connected in parallel, and after being connected in series with the reverse contactor KM2 normally closed contact, they are respectively connected to the upper end of the forward contactor KM1 coil and the upper end of the forward indicator HD1;

[0034] The lower end of the reverse button SB2 and the lower end of the reverse contactor normally open contact KM2-1 are connected in parallel, and after being connected in series with the normally closed contact of the forward contactor KM1, they are respectively connected to the upper end of the reverse contactor KM2 coil and the upper end of the reverse indicator HD2;

[0035] The lower end of the forward contactor normally open contact KM1-2 and the lower end of the reverse contactor normally open contact KM2-2 are connected in parallel, and are respectively connected in series with the upper end of the normally closed contact of the intermediate relay KA2, the upper end of the delayed closed normally open contact of the time relays KT1 to KT14, the upper end of the normally open contacts of the intermediate relays KA2 to KA15, and the upper ends of the normally open contacts of the intermediate relays KA1, KA3-1, KA5-1, KA7-1, KA9-1, KA11-1, KA13-1, and KA15-1, and the upper ends of the normally open contacts of the intermediate relays KA2-1, KA3-2 , KA6-1, KA7-2, KA10-1, KA11-2, KA14-1, KA15-2 normally open contacts are connected at the upper ends, the intermediate relays KA4-1, KA5-2, KA6-2, KA7-3, KA12-1, KA13-2, KA14-2, KA15-3 normally open contacts are connected at the upper ends, the intermediate relays KA8-1, KA9-2, KA10-2, KA11-3, KA12-2, KA13-3, KA14-3, KA15-4 normally open contacts are connected at the upper ends;

[0036] The lower end of the normally closed contact of the intermediate relay KA2 is connected to the upper end of the coil of the intermediate relay KA1 and the upper end of the coil of the time relay KT1 respectively;

[0037] The time relays KT1 to KT14 delay closing of the lower ends of the normally open contacts, are respectively connected in parallel with the lower ends of the normally open contacts of the intermediate relays KA2 to KA15, and are respectively connected in series with the intermediate relays KA3 to KA15, and are respectively connected to the upper ends of the coils of the intermediate relays KA2 to KA15 and the upper ends of the coils of the time relays KT2 to KT14;

[0038] The lower ends of the normally open contacts of the intermediate relays KA1, KA3-1, KA5-1, KA7-1, KA9-1, KA11-1, KA13-1 and KA15-1 are connected in parallel and connected to the upper end of the coil of the S1 programming contactor KM3;

[0039] The lower ends of the normally open contacts of the intermediate relays KA2-1, KA3-2, KA6-1, KA7-2, KA10-1, KA11-2, KA14-1 and KA15-2 are connected in parallel and connected to the upper end of the coil of the S2 programming contactor KM4;

[0040] The lower ends of the normally open contacts of the intermediate relays KA4-1, KA5-2, KA6-2, KA7-3, KA12-1, KA13-2, KA14-2 and KA15-3 are connected in parallel and connected to the upper end of the coil of the S3 programming contactor KM5;

[0041] The lower ends of the normally open contacts of the intermediate relays KA8-1, KA9-2, KA10-2, KA11-3, KA12-2, KA13-3, KA14-3 and KA15-4 are connected in parallel and connected to the upper end of the coil of the S4 programming contactor KM6;

[0042] The lower end of the forward contactor KM1 coil, the lower end of the forward indicator light HD1, the lower end of the reverse contactor KM2 coil, the lower end of the reverse indicator light HD2, the lower ends of the intermediate relays KA1 to KA15 coils, the lower ends of the time relays KT1 to KT14 coils, and the lower ends of the contactors KM3 to KM6 coils are connected in parallel, and the normally closed contact of the series thermal relay FR is connected to one end of the bipolar circuit breaker QF2;

[0043] The other end of the bipolar circuit breaker QF2 is connected to the secondary line power supply port B;

[0044] The digital common terminal COM of the frequency converter VVVF is connected to the upper ends of the normally open contacts of the programming contactors KM1-3, KM2-3, KM3, KM4, KM5 and KM6 respectively;

[0045] The lower ends of the normally open contacts of the programming contactors KM1-3, KM2-3, KM3, KM4, KM5 and KM6 are respectively connected to the forward input terminal FWD, the reverse input terminal REV and the programming terminals S1 to S4 of the frequency converter VVVF.

[0046] In the above technical scheme, when the 15-speed control circuit of a frequency converter of the present invention is turned on in forward rotation, the bipolar circuit breakers QF1 and QF2 are manually closed first, and then the forward button SB1 is pressed, the coil of the forward contactor KM1 and the forward indicator light HD1 are energized, and the normally open contact KM1-1 of the forward contactor is closed and self-locked. The normally open contact KM1-3 of the forward contactor is closed, and the forward input terminal FWD of the frequency converter VVVF is energized. At the same time, the normally open contact KM1-2 of another forward contactor is closed, and the coils of the 1-speed intermediate relay KA1 and the 1-speed time relay KT1 are energized at the same time. The normally open contact of the 1-speed intermediate relay KA1 is closed, the S1 programming contactor KM3 is energized, the normally open contact of the S1 programming contactor KM3 is closed, the S1 programming terminal of the frequency converter VVVF is energized, and the frequency converter starts to operate at the 1-speed frequency.

[0047] When the delay time of the 1st-speed time relay KT1 is reached, the normally open contact of the time relay KT1 is closed, and the 2nd-speed intermediate relay KA2 and the 2nd-speed time relay KT2 coil are energized at the same time. The normally open contact of the intermediate relay KA2 is closed and self-locked. The normally open contact of the other pair of intermediate relays KA1 is closed, the S2 programming contactor KM4 is energized, the normally open contact of the S2 programming contactor KM4 is closed, the S2 programming terminal of the inverter VVVF is energized, and the inverter starts to operate at the 2nd-speed frequency.

[0048] Similarly, the frequency converter gradually operates from 2-speed frequency to 15-speed frequency, and different speed operation curves can be set according to the production process, thereby improving the function of the entire equipment.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A 15-speed control circuit of a frequency converter, comprising a secondary line power port A and a power port B, characterized in that: The control circuit also includes a forward contactor KM1, a reverse contactor KM2, programming contactors KM3 to KM6, intermediate relays KA1 to KA15, a thermal relay FR, time relays KT1 to KT14, bipolar circuit breakers QF1 and QF2, a forward button SB1, a reverse button SB2, a stop button SB3, a forward indicator light HD1, a reverse indicator light HD2 and a frequency converter VVVF; The secondary power supply port A is connected to the upper end of the forward button SB1, the upper end of the forward contactor normally open contact KM1-1, the upper end of the reverse button SB2, the upper end of the reverse contactor normally open contact KM2-1, the upper end of the forward contactor normally open contact KM1-2, and the upper end of the reverse contactor normally open contact KM2-2 through the bipolar circuit breaker QF1 and the stop button SB3; The lower end of the forward button SB1 and the lower end of the forward contactor normally open contact KM1-1 are connected in parallel, and after being connected in series with the reverse contactor KM2 normally closed contact, they are respectively connected to the upper end of the forward contactor KM1 coil and the upper end of the forward indicator HD1; The lower end of the reverse button SB2 and the lower end of the reverse contactor normally open contact KM2-1 are connected in parallel, and after being connected in series with the normally closed contact of the forward contactor KM1, they are respectively connected to the upper end of the reverse contactor KM2 coil and the upper end of the reverse indicator HD2; The lower end of the forward contactor normally open contact KM1-2 and the lower end of the reverse contactor normally open contact KM2-2 are connected in parallel, and are respectively connected in series with the upper end of the normally closed contact of the intermediate relay KA2, the upper end of the delayed closed normally open contact of the time relays KT1 to KT14, the upper end of the normally open contacts of the intermediate relays KA2 to KA15, and the upper ends of the normally open contacts of the intermediate relays KA1, KA3-1, KA5-1, KA7-1, KA9-1, KA11-1, KA13-1, and KA15-1, and the upper ends of the normally open contacts of the intermediate relays KA2-1, KA3-2 , KA6-1, KA7-2, KA10-1, KA11-2, KA14-1, KA15-2 normally open contacts are connected at the upper ends, the intermediate relays KA4-1, KA5-2, KA6-2, KA7-3, KA12-1, KA13-2, KA14-2, KA15-3 normally open contacts are connected at the upper ends, the intermediate relays KA8-1, KA9-2, KA10-2, KA11-3, KA12-2, KA13-3, KA14-3, KA15-4 normally open contacts are connected at the upper ends; The lower end of the normally closed contact of the intermediate relay KA2 is connected to the upper end of the coil of the intermediate relay KA1 and the upper end of the coil of the time relay KT1 respectively; The lower ends of the time relays KT1 to KT14 delay closing of the normally open contacts, are respectively connected in parallel with the lower ends of the normally open contacts of the intermediate relays KA2 to KA15, and are respectively connected in series with the upper ends of the normally closed contacts of the intermediate relays KA3 to KA15. The lower ends of the normally closed contacts of the intermediate relays KA3 to KA15 are respectively connected to the upper ends of the coils of the intermediate relays KA2 to KA15 and the upper ends of the coils of the time relays KT2 to KT14; The lower ends of the normally open contacts of the intermediate relays KA1, KA3-1, KA5-1, KA7-1, KA9-1, KA11-1, KA13-1 and KA15-1 are connected in parallel and connected to the upper end of the coil of the S1 programming contactor KM3; The lower ends of the normally open contacts of the intermediate relays KA2-1, KA3-2, KA6-1, KA7-2, KA10-1, KA11-2, KA14-1 and KA15-2 are connected in parallel and connected to the upper end of the coil of the S2 programming contactor KM4; The lower ends of the normally open contacts of the intermediate relays KA4-1, KA5-2, KA6-2, KA7-3, KA12-1, KA13-2, KA14-2 and KA15-3 are connected in parallel and connected to the upper end of the coil of the S3 programming contactor KM5; The lower ends of the normally open contacts of the intermediate relays KA8-1, KA9-2, KA10-2, KA11-3, KA12-2, KA13-3, KA14-3 and KA15-4 are connected in parallel and connected to the upper end of the coil of the S4 programming contactor KM6; The lower end of the forward contactor KM1 coil, the lower end of the forward indicator light HD1, the lower end of the reverse contactor KM2 coil, the lower end of the reverse indicator light HD2, the lower ends of the intermediate relays KA1 to KA15 coils, the lower ends of the time relays KT1 to KT14 coils, and the lower ends of the contactors KM3 to KM6 coils are connected in parallel, and the normally closed contact of the series thermal relay FR is connected to one end of the bipolar circuit breaker QF2; The other end of the bipolar circuit breaker QF2 is connected to the secondary line power supply port B; The digital common terminal COM of the frequency converter VVVF is connected to the upper ends of the normally open contacts of the programming contactors KM1-3, KM2-3, KM3, KM4, KM5 and KM6 respectively; The lower ends of the normally open contacts of the programming contactors KM1-3, KM2-3, KM3, KM4, KM5 and KM6 are respectively connected to the forward input terminal FWD, the reverse input terminal REV and the programming terminals S1 to S4 of the frequency converter VVVF.

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