Frequency converter double-channel signal setting device and frequency converter

Abstract

The utility model provides a frequency converter two-way signal giving device and a frequency converter, comprising a frequency converter and a central control analog quantity signal module, the central control analog quantity signal module is used for outputting given analog quantity signals to the frequency converter, the frequency converter comprises an input end and an output end, and the central control analog quantity signal module comprises an input end and an output end. The input end of the central control analog quantity signal module is connected with the output end of the frequency converter, the output end of the central control analog quantity signal module is connected with the input end of the frequency converter, and the first analog quantity signal transmitter is connected with the central control analog quantity signal module in parallel and used for outputting a given analog quantity signal to the frequency converter. When the frequency converter cannot receive signals due to abnormal signal transmission of the central control analog quantity signal module, the intermediate relay can be controlled through the signal selection knob switch, and then the first analog quantity signal transmitter is quickly switched to output the signals, so that the time for personnel to go to the field for maintenance is shortened, and the damage to equipment is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to frequency converter technical field, concretely relates to a frequency converter double -way signal given device and frequency converter. BACKGROUND

[0002] In daily production life, frequency converter is widely used, and the frequency converter is a kind of power control equipment controlled by changing the frequency of motor working power supply, when using, the speed signal of frequency converter can be given by the DCS or PLC analog quantity module output of central control room, it is convenient for personnel monitoring and adjustment, when output signal is abnormal interruption, frequency converter cannot receive instruction, and it will be abnormal stop, if using on power, thermoelectric system, personnel handle not in time, it can cause property loss or serious safety accident, frequency converter has operating system, but still exists the risk of running interruption under the condition of not receiving signal.

[0003] The existing frequency converter itself has the operation panel start and the signal selection given by panel, but if signal cannot be received, personnel still need to go to the scene to set parameter, it is not conducive to quickly solve the problem, and there is the risk of equipment interruption.

[0004] Therefore, the prior art still needs further development. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the above technical insufficiency, provides a kind of frequency converter double -way signal given device and frequency converter to solve the problems existing in prior art.

[0006] To achieve the above technical purpose, according to the first aspect of the utility model, the utility model provides a kind of frequency converter double -way signal given device, including frequency converter and central control analog quantity signal module, the central control analog quantity signal module is used to give the analog quantity signal of frequency converter output given, the frequency converter includes input and output, the central control analog quantity signal module includes input and output, the input of the central control analog quantity signal module is connected with the output of the frequency converter, the output of the central control analog quantity signal module is connected with the input of the frequency converter, the device further includes:

[0007] First analog quantity signal transmitter, with the central control analog quantity signal module parallel, is used to give the analog quantity signal of frequency converter output given.

[0008] Specifically, the first analog quantity signal transmitter includes input and output, the input of the first analog quantity signal transmitter is connected with the output of the frequency converter, and the output of the first analog quantity signal transmitter is connected with the input of the frequency converter.

[0009] Specifically, the device further comprises an intermediate relay arranged between the central control analog signal module and the frequency converter.

[0010] Specifically, the intermediate relay comprises an input end and an output end.

[0011] The input end of the intermediate relay is connected with the output end of the central control analog signal module, and the output end of the intermediate relay is connected with the input end of the frequency converter.

[0012] Specifically, the intermediate relay is a single-pole double-throw relay, and the single-pole double-throw relay comprises a normally open contact and a normally closed contact.

[0013] Specifically, the input end of the intermediate relay is connected with the output end of the first analog signal transmitter.

[0014] Specifically, the first analog signal transmitter is connected in parallel with the central control analog signal module through the intermediate relay.

[0015] Specifically, the device further comprises a signal selection knob switch and a power module, and the power module is connected in series with the signal selection knob switch, the intermediate relay and the first analog signal transmitter in sequence.

[0016] Specifically, the signal selection knob switch is connected in series with the intermediate relay and the central control analog signal module in sequence.

[0017] According to the second aspect of the utility model, the utility model also provides a frequency converter, and the frequency converter comprises the frequency double-path signal given device.

[0018] Beneficial effects:

[0019] The utility model provides a kind of frequency converter double-path signal given device, central control analog signal module and the circuit of first analog signal transmitter two-way selection analog quantity input signal are arranged, the switching of intermediate relay control circuit is utilized, can guarantee when central control analog signal module signal transmission anomaly leads to frequency converter unable to receive normal signal, can pass through signal selection knob switch control intermediate relay, and then quickly switch to first analog signal transmitter and output signal, control frequency converter, so that when fault occurs, it is not necessary to enter frequency converter internal adjustment parameter, can be quickly recovered equipment start by circuit switching, reduce the time of personnel to go to the scene maintenance, avoid the damage of equipment, greatly enhance the reliability and flexibility of entire control system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the circuit connection schematic view of frequency converter double-path signal given device provided in the specific embodiment of the utility model;

[0021] Figure 2 is the circuit connection structure schematic diagram of the signal selection knob switch control intermediate relay provided in the embodiment of the utility model;

[0022] Among them, the above-mentioned drawing includes the following figure marks:

[0023] 1, frequency converter;2, central control analog signal module;3, first analog signal transmitter;4, intermediate relay;5, signal selection knob switch;6, power module;7, adjusting knob;8, digital display screen. Specific embodiments

[0024] In order to make the personnel in the art better understand the technical scheme of the utility model, the technical scheme of the utility model is described clearly and completely below in combination with the drawings of the utility model, based on the embodiment in the present application, other similar embodiments obtained by the person skilled in the art without making creative labor should belong to the scope of protection of the present application.In addition, the direction words mentioned in the following embodiments, such as 'up', 'down', 'left', 'right', etc., are only the direction of the drawing, therefore, the direction words used are used to explain but not limit the utility model.

[0025] The utility model is further described below in combination with the drawings and preferred embodiments.

[0026] Please refer to Figure 1 and Figure 2 , the embodiment provides a frequency converter two-way signal setting device, including frequency converter 1 and central control analog signal module 2, the central control analog signal module 2 is used to give the frequency converter 1 output given analog signal, the frequency converter 1 includes input and output, the central control analog signal module 2 includes input and output, the input of the central control analog signal module 2 is connected with the output of the frequency converter 1, the output of the central control analog signal module 2 is connected with the input of the frequency converter 1, the device still includes:

[0027] First analog signal transmitter 3, with the central control analog signal module 2 is parallel, for the frequency converter 1 output given analog signal.

[0028] It can be understood that the central control analog signal module 2 is a DCS analog module or a PLC analog module of a central control room, which can be used to control the rotating speed of the frequency converter 1 by outputting a given analog signal, but when the central control analog signal module 2 cannot receive a signal due to an abnormal situation, the frequency converter 1 will be abnormally stopped without receiving an instruction, and then professional personnel need to go to the site to set parameters, which consumes manpower and wastes time, and is not conducive to quickly solving problems, and the utility model discloses a small analog signal transmitter, that is, a first analog signal transmitter 3, which is connected in parallel with the DCS analog module or the PLC analog module, forms a double-path given signal of the frequency converter 1, and switches the analog signal given to the frequency converter 1 by which path manually, so that the normal operation of the equipment can be ensured when an abnormal situation occurs.

[0029] Referring to Figure 1 In the frequency converter double-path signal given device, the first analog signal transmitter 3 comprises an input end and an output end, the input end of the first analog signal transmitter 3 is connected with the output end of the frequency converter 1, and the output end of the first analog signal transmitter 3 is connected with the input end of the frequency converter 1, so that a closed-loop architecture is formed in which the first analog signal transmitter 3 is connected with the input end of the frequency converter 1.

[0030] Preferably, the first analog signal transmitter 3 can be a 4-20mA analog signal generator, a digital display screen 8 is arranged on the first analog signal transmitter 3, which is used to display the value of the analog signal given by the first analog signal transmitter 3, and an adjusting knob 7 is further arranged on the first analog signal transmitter 3, which is used to adjust the value of the analog signal output by the first analog signal transmitter 3, that is, when an abnormal situation occurs, the first analog signal transmitter 3 is switched to give the frequency converter 1 a signal, and then the size of the analog signal to be output can be adjusted through the adjusting knob 7, so that the user can operate conveniently.

[0031] Referring to Figure 1 In the frequency converter double-path signal given device, the device further comprises an intermediate relay 4 which is arranged between the central control analog signal module 2 and the frequency converter 1 and is used to control the on-off of a circuit manually, so as to control whether the central control analog signal module 2 outputs a given analog signal to the frequency converter 1 manually.

[0032] Referring to Figure 1 The intermediate relay 4 comprises an input end and an output end;

[0033] The input end of the intermediate relay 4 is connected with the output end of the central control analog signal module 2, and the output end of the intermediate relay 4 is connected with the input end of the frequency converter 1.

[0034] Preferably, the intermediate relay 4 is a single-pole double-throw relay, which includes a normally open contact and a normally closed contact.

[0035] In some specific embodiments, the single-pole double-throw relay includes an input end and an output end, the input end of the single-pole double-throw relay (the coil side of the intermediate relay 4) is connected to the output end of the central control analog signal module 2, which is used to generate control signals (such as 4-20 mA or 0-10 V analog signals) that adjust the working state of the frequency converter 1 according to the set value of the system, and the output end of the single-pole double-throw relay includes a common terminal, a normally open contact and a normally closed contact, which can switch between two different circuits, when the coil is not activated, the common terminal is connected with the normally closed contact; when the coil is activated, the common terminal is connected with the normally open contact, which makes it able to switch between two different control modes. In this embodiment, when the normally closed contact of the intermediate relay 4 is closed, the control signal of the central control analog signal module 2 is allowed to pass through and reach the frequency converter 1, when it is necessary to switch to the backup control path, i.e. the first analog signal transmitter 3, the intermediate relay 4 coil loses power, the normally open contact is closed, cutting off the current control path and enabling the backup path, greatly improving the stability and reliability of the system.

[0036] Referring to Figure 1 , the input end of the intermediate relay 4 is connected with the output end of the first analog signal transmitter 3.

[0037] Referring to Figure 1 , the first analog signal transmitter 3 is connected in parallel with the central control analog signal module 2 through the intermediate relay 4.

[0038] Referring to Figure 1 and Figure 2 , the device further includes a signal selection knob switch 5 and a power module 6, the power module 6 is connected in series with the signal selection knob switch 5, the intermediate relay 4 and the first analog signal transmitter 3 in sequence.

[0039] Referring to Figure 1 and Figure 2 , the signal selection knob switch 5 is connected in series with the intermediate relay 4 and the central control analog signal module 2 in sequence, the signal selection knob switch 5 is used to manually control the on-off of the normally open contact and the normally closed contact of the single-pole double-throw relay, so as to quickly switch the signal given circuit of the frequency converter 1 when an abnormality occurs, thereby ensuring the normal operation of the frequency converter 1 device.

[0040] Referring to Figure 1 and Figure 2The running process of the frequency converter dual-channel signal given device in the embodiment is as follows: when the system signal transmission is normal, the normally closed contact of the intermediate relay 4KA1 is in a closed state, the circuit between the central control analog signal module 2 and the frequency converter 1 is conducted, and the analog signal given by the DCS or PLC analog module is given to the frequency converter 1 through the normally closed contact of the KA1; when it is found that the system signal transmission is abnormal and the frequency converter 1 cannot receive the given signal of the DCS or PLC analog module, the signal selection knob switch 5SB1 is closed by manual operation, the intermediate relay 4KA1 is actuated, and the normally open contact is closed, at this time, the circuit between the first analog signal transmitter 3 and the frequency converter 1 is conducted, and the frequency converter 1 continues to work after receiving the analog signal given by the first analog signal transmitter 3.

[0041] Further, the first analog signal transmitter 3 always outputs an analog signal (4-20 mA or voltage signal, depending on the demand of the frequency converter 1) at the normally open contact of the KA1 through the adjusting knob 7 for standby use, the adjusting knob 7 can manually adjust the size of the output signal to control the output of the frequency converter 1, and the output signal is displayed on the digital display screen 8.

[0042] It should be noted that the embodiment provides a frequency converter dual-channel signal given device, which sets a circuit for selecting analog input signals through the central control analog signal module and the first analog signal transmitter, and uses the intermediate relay to control the switching of the circuit, so that when the central control analog signal module cannot transmit signals normally and the frequency converter cannot receive normal signals, the intermediate relay can be controlled through the signal selection knob switch, and then the first analog signal transmitter can be quickly switched and output signals, so that the frequency converter can be controlled, and when a fault occurs, it is not necessary to enter the frequency converter to adjust parameters, the equipment can be quickly restored by switching the circuit, the time for personnel to go to the site for maintenance can be reduced, the damage of the equipment can be avoided, and the reliability and flexibility of the entire control system are greatly enhanced.

[0043] The embodiment further provides a frequency converter, which comprises the above-mentioned frequency converter dual-channel signal given device, specifically comprises a frequency converter 1 and a central control analog signal module 2, the central control analog signal module 2 is used for outputting given analog signals to the frequency converter 1, the frequency converter 1 comprises an input end and an output end, the central control analog signal module 2 comprises an input end and an output end, the input end of the central control analog signal module 2 is connected with the output end of the frequency converter 1, the output end of the central control analog signal module 2 is connected with the input end of the frequency converter 1, and the device further comprises a first analog signal transmitter 3 which is connected with the central control analog signal module 2 in parallel and is used for outputting given analog signals to the frequency converter 1.

[0044] Referring to Figure 1 and Figure 2The specific working process of the frequency converter dual-channel signal setting device is as follows: in normal circumstances, the intermediate relay 4 of the analog signal setting module 2 (including a DCS or a PLC analog signal setting module) is closed, and the signal is transmitted to the analog input terminal of the frequency converter 1 to provide a signal for the frequency converter 1 device control; the first analog signal transmitter 3 is installed in parallel with the analog signal setting module 2, and the first analog signal transmitter 3 is connected in series with the signal selection knob switch 5, the power module 6, and the normally open and closed contacts of the intermediate relay 4; the first analog signal transmitter 3 is provided with an adjusting knob 7, and the size of the analog output signal can be adjusted; when an abnormality occurs, the analog output signal can be adjusted, and the first analog signal transmitter 3 can be directly switched from the analog signal setting module 2 to the first analog signal transmitter 3.

[0045] The embodiment provides a frequency converter, and specifically provides a frequency converter dual-channel signal setting device, which is provided with a control analog signal module and a first analog signal transmitter circuit for selecting analog input signals in two ways; the switching of the intermediate relay control circuit can ensure that when the signal transmission of the control analog signal module is abnormal and the frequency converter cannot receive normal signals, the intermediate relay can be controlled through the signal selection knob switch, and then the first analog signal transmitter can be quickly switched and output signals, so that the frequency converter can be controlled, and when a fault occurs, it is not necessary to enter the frequency converter to adjust parameters, the equipment can be quickly started through circuit switching, the time for personnel to go to the site for maintenance is reduced, the damage of the equipment is avoided, and the reliability and flexibility of the entire control system are greatly enhanced.

[0046] The technical features described above can be combined in any way. Although all possible combinations of the technical features are not described, any combination of the technical features should be considered to be covered by the present description, as long as there is no contradiction.

[0047] The specific implementation method of the above-mentioned utility model does not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A dual-channel signal input device for a frequency converter, comprising a frequency converter (1) and a central control analog signal module (2), wherein the central control analog signal module (2) is used to output a given analog signal to the frequency converter (1), the frequency converter (1) includes an input terminal and an output terminal, the central control analog signal module (2) includes an input terminal and an output terminal, the input terminal of the central control analog signal module (2) is connected to the output terminal of the frequency converter (1), and the output terminal of the central control analog signal module (2) is connected to the input terminal of the frequency converter (1), characterized in that, The device further includes: The first analog signal transmitter (3) is connected in parallel with the central control analog signal module (2) and is used to output a given analog signal to the frequency converter (1).

2. The inverter dual-channel signal input device according to claim 1, characterized in that, The first analog signal transmitter (3) includes an input terminal and an output terminal. The input terminal of the first analog signal transmitter (3) is connected to the output terminal of the frequency converter (1), and the output terminal of the first analog signal transmitter (3) is connected to the input terminal of the frequency converter (1).

3. The inverter dual-channel signal input device according to claim 2, characterized in that, The device also includes an intermediate relay (4), which is located between the central control analog signal module (2) and the frequency converter (1).

4. The inverter dual-channel signal input device according to claim 3, characterized in that, The intermediate relay (4) includes an input terminal and an output terminal; The input terminal of the intermediate relay (4) is connected to the output terminal of the central control analog signal module (2), and the output terminal of the intermediate relay (4) is connected to the input terminal of the frequency converter (1).

5. The inverter dual-channel signal input device according to claim 4, characterized in that, The intermediate relay (4) is a single-pole double-position relay, which includes normally open contacts and normally closed contacts.

6. The inverter dual-channel signal input device according to claim 5, characterized in that, The input terminal of the intermediate relay (4) is connected to the output terminal of the first analog signal transmitter (3).

7. The inverter dual-channel signal input device according to claim 6, characterized in that, The first analog signal transmitter (3) and the central control analog signal module (2) are connected in parallel through the intermediate relay (4).

8. The inverter dual-channel signal input device according to claim 7, characterized in that, The device also includes a signal selection rotary switch (5) and a power module (6), wherein the power module (6) is connected in series with the signal selection rotary switch (5), the intermediate relay (4), and the first analog signal transmitter (3).

9. The inverter dual-channel signal input device according to claim 8, characterized in that, The signal selection rotary switch (5) is connected in series with the intermediate relay (4) and the central control analog signal module (2).

10. A frequency converter, characterized in that, The frequency converter (1) includes a frequency converter dual-channel signal input device as described in any one of claims 1 to 9.

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