CN210629384U - Simple frequency converter protection and watchdog system - Google Patents

Abstract

The utility model relates to a simple and easy converter protection and watchdog system, including three-phase four-wire main power supply switch SM, three-phase fuse FU1, ac contactor KM1, lack looks detection and protection auxiliary relay KA1 ~ KA4, reset time relay KT1, set time relay KT2, three-phase four-wire main power supply switch SM, three-phase fuse FU1 and ac contactor KM1 are connected to the converter after establishing ties in proper order, the utility model discloses can overcome prior art's not enough, can save artifical maintenance detection cost, can eliminate equipment trouble in equipment trouble's the very first time simultaneously.

Description

Simple frequency converter protection and watchdog system

Technical Field

The utility model relates to a motor control equipment's control protection system especially relates to a simple and easy external protection controlling means that is used for unmanned nurse of motor control equipment such as converter, soft starter.

Background

At present, no related products of the frequency converter watchdog exist in the market, the watchdog mostly adopts a self-contained soft program of the frequency converter to carry out related control, an embedded system is adopted, a special embedded protection device is separately developed, PLC control is adopted, the cost is high, the construction technical requirement is higher, the later maintenance difficulty is large, the user intervention difficulty is large or manual intervention is basically impossible. When the frequency converter fails, external manual power failure and power re-on are needed to eliminate the protection codes, whether a manual real-time monitoring system works normally or not is needed, and power failure and power re-on operation are carried out when equipment fails, and the problems of negligence or untimely disposal and the like can also occur by adopting manual intervention and real-time monitoring. Simple and easy converter protection and watchdog system can automated inspection and control, alleviate artifical maintenance cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provides one kind and can save artifical maintenance detection cost, can eliminate equipment trouble's simple and easy converter protection and watchdog system in equipment trouble's the very first time simultaneously.

A simple frequency converter protection and watchdog system comprises a three-phase four-wire main power supply switch SM, a three-phase fuse FU1, an alternating current contactor KM1, a phase-loss detection and protection auxiliary relay KA1-KA4, a reset time relay KT1 and a set time relay KT2, wherein the three-phase four-wire main power supply switch SM, the three-phase fuse FU1 and the alternating current contactor KM1 are sequentially connected in series and then connected to a frequency converter, and the phase-loss detection and protection auxiliary relay KA1-KA3 can start a power supply system after setting the set time only if and only if the three-phase four-wire power supply is normal; the reset time relay KT1 starts a reset circuit when the system is normally powered and has no output when the preset time of the time relay is exceeded or the output-free time due to faults exceeds the preset time of the time relay in the using process of the system, and the system is powered off to reset the information of the frequency converter; the setting time relay KT2 supplies power to the system when the system is powered on or reset to reach the time preset by the time relay, and the frequency converter is powered on and normally started.

Further, the capacity of the alternating current contactor KM1 is determined by the capacity of the frequency converter and the input power of the output electric appliance; the logical relationship is as follows:

KM1＝KA1·KA2·KA3·KT2。

furthermore, the auxiliary relays KA1-KA4 are all composed of common intermediate relays with coils of 220V, only one set of normally open contacts are needed for KA1-KA3, and only one set of normally closed contacts are needed for KA 4.

Further, the reset time relay KT1 and the set time relay KT2 use JSZ3C-B time relays with four-segment range adjustability; the time of the time relay is configured according to the requirement set by the system, and the logical relationship is as follows:

to sum up, the utility model discloses following beneficial effect has:

1. when the simple frequency converter protection and watchdog system detects that an external three-phase power supply system has a phase failure, the power-off protection is automatically implemented;

2. the simple frequency converter protection and watchdog system can realize delayed power supply after being powered on, and can prevent the power-on instant surge from being overlarge due to the simultaneous starting of a plurality of devices after power failure;

3. the simple frequency converter protection and watchdog system can automatically monitor whether the frequency converter normally works, and the watchdog disconnection system is started to supply power to realize system power-off reset when the frequency converter has no output within a set time or no output time exceeds the set time after the frequency converter works for a period of time;

4. the simple frequency converter protection and watchdog system can realize that the system is electrified again within a set time after the system is reset after power failure to realize electrification and setting;

5. simple and easy converter protection and watchdog system can also save artifical maintenance detection cost, can eliminate equipment trouble simultaneously in equipment trouble's the very first time, reduce unnecessary because of artifical guardianship does not put in place the secondary accident that causes (like cutting off the water), reach the effect of saving time, laborsaving, province responsibility.

Drawings

Fig. 1 is an application circuit diagram of the simple frequency converter protection and watchdog system of the present invention.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the accompanying drawings.

Fig. 1 is an application diagram of the simple frequency converter protection and watchdog system according to the present invention, wherein SM is a three-phase four-wire main power switch; FU1 is a three-phase fuse; KM1 is an alternating current contactor; the 'frequency conversion' is an external frequency converter, is not in the range of accessories of the protection system, but is a protected object; KA1-KA3 are open-phase detection and protection auxiliary relays, and a power supply system can be started after the set time is set only if and only if three-phase four-wire power supply is normal; KT1 is the time relay that resets, and when the system normally supplies power and no output exceeds the time that this time relay is preset or the system does not have output time because of the trouble in the use and exceeds the time that this time relay is preset then start reset circuit, system outage reset converter information.

KT2 is a setting time relay, when the system is powered on or reset to reach the time preset by the time relay, the power supply system is powered on, and the frequency converter is normally started;

the logic relation among the AC contactor KM1, the reset time relay KT1 and the set time relay KT2 is as follows:

KM1＝KA1·KA2·KA3·KT2；

the upper end and the lower end of the frequency conversion in the figure 1 are respectively connected to the power supply end and the output end of the frequency converter, the system power supply '-X' is connected to the output end of the original frequency converter, and the capacity of the main contactor KM1 in the system is determined by the capacity of the frequency converter and the input power of an output electric appliance; the auxiliary relays KA1-KA4 are all formed by common intermediate relays with coils of 220V, only one group of normally open contacts are needed for KA1-KA3, and only one group of normally closed contacts are needed for KA 4; the time relay time is configured according to the design requirement of the system, and a JSZ3C-B relay with four-segment range adjustment is recommended to be used.

The utility model discloses utilize basic logic control relation, solve the actual maintenance problem with the minimum cost, realize the function of time real-time detection and control, can reach the secondary accident of avoiding leading to because of the inevitable blind area of artifical detection can also be avoided to the equipment damage who leads to because of the external power supply problem.

The above detailed description is not to be considered as limiting the invention, and insubstantial changes from the disclosure herein may be made by those skilled in the art without departing from the scope of the invention.

Claims (4)

1. The utility model provides a simple and easy converter protection and watchdog system which characterized in that: the three-phase four-wire main power supply switch SM, the three-phase fuse FU1, the alternating current contactor KM1, the open-phase detection and protection auxiliary relays KA1-KA4, the reset time relay KT1 and the set time relay KT2 are sequentially connected in series and then connected to a frequency converter, wherein the open-phase detection and protection auxiliary relay KA1-KA3 can start a power supply system after the set time only when the three-phase four-wire power supply is normal; the reset time relay KT1 starts a reset circuit when the system is normally powered and has no output when the preset time of the time relay is exceeded or the output-free time due to faults exceeds the preset time of the time relay in the using process of the system, and the system is powered off to reset the information of the frequency converter; the setting time relay KT2 supplies power to the system when the system is powered on or reset to reach the time preset by the time relay, and the frequency converter is powered on and normally started.

2. The simple transducer protection and watchdog system of claim 1, wherein: the capacity of the alternating current contactor KM1 is determined by the capacity of the frequency converter and the input power of the output electric appliance; the logical relationship is as follows:

KM1＝KA1·KA2·KA3·KT2。

3. the simple transducer protection and watchdog system of claim 1, wherein: the auxiliary relays KA1-KA4 are all composed of common intermediate relays with coils of 220V, only one set of normally open contacts are needed for KA1-KA3, and only one set of normally closed contacts are needed for KA 4.

4. The simple transducer protection and watchdog system of claim 1, wherein: the reset time relay KT1 and the set time relay KT2 use JSZ3C-B time relays with four-section range adjustability; the time of the time relay is configured according to the requirement set by the system, and the logical relationship is as follows:

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