CN214503857U

CN214503857U - Automatic abnormity monitoring and alarming system for special energy consumption brake unit of motor frequency converter

Info

Publication number: CN214503857U
Application number: CN202120533976.0U
Authority: CN
Inventors: 周贵财
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-10-26
Anticipated expiration: 2031-03-15

Abstract

The utility model discloses an automatic unusual alarm system that supervises of special energy consumption braking unit of motor converter, including power module, control signal input module, by the voltage input module of supervision, step-down partial pressure module one, step-down partial pressure module two, overvoltage protection module, host system, alarm module, power module connects host system, and control signal input module connects step-down partial pressure module one, and step-down partial pressure module one connects host system, is connected step-down partial pressure module two by the voltage input module of supervision, and step-down partial pressure module two connects overvoltage protection module, and host system is connected to overvoltage protection module, and alarm module is connected to host system, compares with prior art, the beneficial effects of the utility model are that: the scheme solves the problem that whether the energy consumption brake unit of the real-time monitoring frequency converter breaks down or not by using a simple circuit, achieves the aim of lightening the condition that whether equipment is abnormal or not is checked by a worker or not, the check and the supervision on other equipment are influenced, and the whole equipment has safety, stability and effectiveness.

Description

Automatic abnormity monitoring and alarming system for special energy consumption brake unit of motor frequency converter

Technical Field

The utility model relates to a motor field specifically is an automatic unusual alarm system that supervises of special power consumption braking unit of motor converter.

Background

The energy consumption braking unit is used for the motor to run, when the frequency converter controls the motor to change from high speed to low speed, because the mechanical load is added on the motor running system, the sudden deceleration can generate physical inertia rotation, so that the rotating speed of the motor is higher than the set speed of the frequency converter, at this time, the motor can change from passive to active, namely, the motor can change into a generator state, and regenerative electric energy can be generated, the electric energy can be converted into direct current voltage through an internal circuit of the frequency converter, the voltage can be increased along with the speed increase of the motor, the bus voltage of the frequency converter exceeds equipment to damage the frequency converter and related equipment, and the excessive regenerative electric energy consumption is needed to be consumed to reduce the bus voltage to protect the frequency converter, and the protection function is formed by the energy consumption braking unit of the frequency converter and a braking resistor.

The regenerative electric energy is consumed, high power consumption can be generated on the brake resistor, the consumption can be caused to the fact that the brake resistor is blown, or a main power switch tube IGPT in the transducer energy-consuming brake unit is blown or short-circuited, the conventional transducer energy-consuming brake unit has no function of sending a sensible abnormal alarm to nearby working personnel when the resistor is blown, the switch is opened, the IGPT is blown or the short-circuited, and the working personnel do not know that the equipment is abnormal until the transducer starts overvoltage protection or overcurrent protection to stop running until the machine stops running and need to process the abnormal alarm only when an abnormal code appears on a display screen or a display lamp of the transducer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic unusual alarm system that supervises of special power consumption braking unit of motor converter to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides an automatic unusual alarm system that supervises of special energy consumption braking unit of motor converter, includes power module, control signal input module, is supervised voltage input module, step-down partial pressure module one, step-down partial pressure module two, overvoltage protection module, host system, alarm module, power module connects host system, and control signal input module connects step-down partial pressure module one, and step-down partial pressure module one connects host system, is connected step-down partial pressure module two by supervision voltage input module, and step-down partial pressure module two connects overvoltage protection module, and host system is connected to overvoltage protection module, and alarm module is connected to host system.

As a further aspect of the present invention: the input voltage of the power supply module is 5V, and voltage is provided for the circuit.

As a further aspect of the present invention: the first voltage reduction and division module is composed of a resistor R8 and a resistor R9, the second voltage reduction and division module is composed of a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7, and the first voltage reduction and division module and the second voltage reduction and division module consume high voltage into low voltage to protect normal operation of the main control chip.

As a further aspect of the present invention: the overvoltage protection module is composed of a voltage stabilizing diode ZD1, and a protection circuit is safe.

As a further aspect of the present invention: the main control module comprises a chip PMS171B and a control alarm module.

As a further aspect of the present invention: the alarm module comprises an alarm lamp LED1 and an alarm BUZZER BUZZER, and plays a role in prompting that a brake resistor is blown off when the frequency converter works, or a main power switch tube IGPT in an energy consumption brake unit of the frequency converter is blown off or short circuit.

Compared with the prior art, the beneficial effects of the utility model are that: whether real time monitoring converter work breaks down is solved to the simple circuit of this scheme utilization, reaches and alleviates whether the staff need not the time check equipment have the anomaly and influence inspection and supervision to other equipment, influences staff's reassurance operation, owing to be the operation of supervising of real-time nature, gives effectual assurance to equipment overall security, stability, validity etc..

Drawings

Fig. 1 is a block diagram of a frequency converter circuit.

FIG. 2 is a block diagram of a dissipative braking unit.

Fig. 3 is a circuit diagram of an automatic abnormality monitoring and alarming system of a special energy consumption brake unit for a motor frequency converter.

Figure 4 is a buzzer alarm/pause status logic table.

FIG. 5 is a schematic diagram of a dissipative braking unit.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

Example 1: referring to fig. 5, an automatic abnormality monitoring and alarming system for an energy-consuming brake unit dedicated for a motor frequency converter, a power supply module for providing power supply, a control signal input module for inputting control signal, a monitored voltage input module for inputting monitoring voltage, a first voltage reduction and voltage division module for reducing voltage, a second voltage reduction and voltage division module for dividing voltage, an overvoltage protection module for an overvoltage protection circuit, a main control module for receiving signals and controlling whether to alarm or not, an alarm module for emitting light and sounding, the power module is connected with the main control module, the control signal input module is connected with the first voltage reduction and voltage division module, the first voltage reduction and voltage division module is connected with the main control module, the monitored voltage input module is connected with the second voltage reduction and voltage division module, the second voltage reduction and voltage division module is connected with the overvoltage protection module, the overvoltage protection module is connected with the main control module, and the main control module is connected with the alarm module.

As shown in fig. 3, a 5V voltage is connected to pin 4 of PMS171B, a control signal input module is connected to a resistor R8, the other end of resistor R8 is connected to pin 8 of resistor R9 and PMS171B, the other end of resistor R9 is grounded, a monitored voltage input module is connected to a resistor R7, the other end of resistor R7 is connected to a resistor R6, the other end of resistor R6 is connected to a resistor R5, the other end of resistor R5 is connected to a resistor R4, the other end of resistor R4 is connected to a resistor R3, the other end of resistor R3 is connected to a resistor R2, the cathode of zener diode ZD1, pin 9 of PMS171B, the anode of zener diode ZD1 is grounded, the other end of resistor R2 is grounded, pin 2 of PMS171B is connected to a resistor R1, the other end of resistor R1 is connected to the anode of LED1, the cathode of the alarm lamp LED1 is grounded, the cathode of the alarm lamp, the pin 1 of PMS171B is connected to the BUZZER of the BUZZER.

The working circuit of the motor frequency converter is shown in figure 1: the three-phase 380V alternating current firstly passes through bridge type rectification, and through the soft control switch, the soft control switch is connected with the brake unit and is detected whether converter busbar voltage surpasses the settlement voltage range, and the soft control switch exports three-phase alternating current power supply machine work through IGPT switch tube simultaneously.

The utility model discloses a theory of operation is: referring to figures 1-5 of the drawings,

1, the voltage of converter power consumption braking unit input can be normal with the input voltage difference when unusual at converter operating condition, leads to the change of monitoring voltage according to the different voltage of input for main control module produces different output state, and makes corresponding output, and normal time does not send out the police dispatch newspaper, and when unusual, bee calling organ can ring, and the warning light can give out light.

Normally, one end of the brake resistor is connected with the positive pole of the bus voltage, the other end is connected with the collector of the pin IGPT C, the bus voltage is provided with hundreds of volts (different voltage values according to different power supply voltages), the voltage of hundreds of volts is reduced to about 2.5-3V by a voltage division circuit to be used as a monitored voltage, the voltage is input to the pin No. 9 of the PMS171B, and the voltage is called the monitored voltage.

3, at the position of the brake function starting point on the circuit of the energy consumption brake unit of the frequency converter, the brake function is triggered to start along with the rising of the bus voltage, a driving voltage of about 15V is output to the IGPT grid, a 2.5V control signal voltage is synchronously output to the No. 8 pin of the PMS171B by utilizing the 15V voltage signal, and the alarm chip utilizes the control signals to determine whether the brake resistor and the IGPT are normal at the moment.

4, when the frequency converter works abnormally, the pin 1 of the PMS171B outputs a frequency of about 4KhzPWM level to push the alarm buzzer to send out an intermittent alarm sound of about 70 decibels.

5, pin 2 of PMS171B is connected with LED, and when alarming, it will flash synchronously.

6, actual operation of the dissipative braking unit:

first condition (normal): when the motor is normally used as a load, because the rotating speed is synchronous with the frequency converter or when the rotating speed is increased, the speed is the same as or lower than the speed of the frequency converter, no regenerative electric energy is generated at this time, the bus voltage of the energy-consuming braking unit of the frequency converter is about 540V (about 540V when 380V power supply voltage is used, and the 220V power supply voltage is reduced in proportion), and the bus voltage does not exceed the starting voltage value, so the starting and stopping control point of the energy-consuming braking unit of the frequency converter does not output a control voltage signal to the No. 8 pin of the IGPT and the PMS171B, the voltage of the No. 8 pin is 0, and the No. 9 pin of the PMS171B is in a stopping state because of the IGPT, so the monitoring voltage is not switched to the braking resistor, and can be kept at 2.5V, the chip judges that the motor is normal, and does not send an alarm signal. At this time, pin 8 of PMS171B is low; pin 9 of PMS171B is high and is determined to be normal. (in FIG. 4, "0" indicates a low level and "1" indicates a high level)

Second condition (abnormal): when the brake resistor has been blown, but IGPT is normal, pin 8 of PMS171B becomes 0V, and pin 9 of PMS171B also becomes 0V because the bus voltage is not increased; at this time, pin 8 of PMS171B is at low level, and pin 9 of PMS171B is at low level, and an alarm signal is generated when it is determined that the pin is abnormal. (due to resistance disconnection)

Third condition (abnormal): when the brake resistor is not opened, but the IGPT is short-circuited, the IGPT directly short-circuits the voltage on the connection pin of the brake resistor to the negative end of the power supply through the emitter of the IGPT, at this time, the monitored voltage drops to nearly 0V, the pin 9 of the PMS171B disappears to become 0V, but the pin 8 of the PMS171B still remains 0V because the bus bar is still in a low-voltage state, and at this time, the pin 8 of the PMS171B is at a low level; pin 9 of PMS171B is low; if the abnormal condition is determined, an alarm signal is sent out. (short circuit due to IGPT)

Fourth condition (abnormal): when the braking resistor is not opened, but the IGPT is blown open, if the bus voltage generates electricity because the motor rotates slowly from high speed or needs to stop suddenly, the bus voltage is increased, when the bus voltage is increased to the braking set value, the control point of the frequency converter energy consumption braking unit is changed from low voltage to high voltage, and simultaneously the control voltage of 2.5V is output to pin 8 of PMS171B, the monitored voltage has high voltage because the IGPT is disconnected (opened), so pin 9 of PMS171B still has about 2.5V. At this time, pin 8 of the PMS171B is controlled to be at a high level; pin 9 of PMS171B is high; if the abnormal condition is determined, an alarm signal is sent out. (open circuit due to IGPT)

Fifth condition (normal): when the bus voltage is increased to a braking set value, a control point of a frequency converter energy consumption braking unit is converted from low voltage to high voltage, meanwhile, a control voltage of a control signal 2.5V is output to a pin 8 of the PMS171B, a braking resistor is connected with a collector electrode of an ICPT (integrated circuit transformer), so that the detection voltage is low level, a pin 9 of the PMS171B is 0V, at the moment, the pin 8 of the PMS171B is high level, the pin 9 of the PMS171B is low level, the chip judges that the voltage is normal, and an alarm signal is not sent out.

Embodiment 2, based on embodiment 1, fig. 3 shows that the overvoltage protection module is composed of a zener diode ZD1, and the zener diode ZD1 will conduct when the voltage across the zener diode ZD1 exceeds 3V, so as to ensure that the voltage does not exceed 3V, and protect the circuit.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an automatic unusual alarm system that supervises of special energy consumption braking unit of motor converter, includes power module, control signal input module, is supervised voltage input module, step-down partial pressure module one, step-down partial pressure module two, overvoltage protection module, host system, alarm module, its characterized in that, power module connects host system, and control signal input module connects step-down partial pressure module one, and step-down partial pressure module one connects host system, is supervised voltage input module connection step-down partial pressure module two, and step-down partial pressure module two connects overvoltage protection module, and host system is connected to overvoltage protection module, and alarm module is connected to host system.

2. The automatic abnormity supervision and alarm system of the special energy consumption brake unit for the motor frequency converter as claimed in claim 1, wherein the input voltage of the power module is 5V.

3. The automatic abnormality monitoring and alarming system for the special energy-consuming brake unit of the motor frequency converter as claimed in claim 1, wherein the first voltage-reducing and voltage-dividing module is composed of a resistor R8 and a resistor R9, and the second voltage-reducing and voltage-dividing module is composed of a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7.

4. The automatic abnormity supervision and alarm system of the special energy consumption brake unit for the motor frequency converter is characterized in that the overvoltage protection module is composed of a voltage stabilizing diode ZD 1.

5. The automatic abnormality monitoring and alarming system for the motor frequency converter dedicated dissipative braking unit according to claim 1, wherein the master control module comprises a chip PMS 171B.

6. The automatic abnormity monitoring and alarming system for the special energy-consuming brake unit of the motor frequency converter is characterized in that the alarming module comprises an alarming lamp LED1 and an alarming BUZZER BUZZER.