CN202084982U - Bypass device of low voltage converter - Google Patents
Bypass device of low voltage converter Download PDFInfo
- Publication number
- CN202084982U CN202084982U CN2011202058403U CN201120205840U CN202084982U CN 202084982 U CN202084982 U CN 202084982U CN 2011202058403 U CN2011202058403 U CN 2011202058403U CN 201120205840 U CN201120205840 U CN 201120205840U CN 202084982 U CN202084982 U CN 202084982U
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- CN
- China
- Prior art keywords
- power supply
- low voltage
- motor
- bypass power
- frequency converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Protection Of Generators And Motors (AREA)
Abstract
The utility model provides a bypass device of a low voltage converter, which comprises a lower voltage converter, and a motor connected with the low voltage converter. The bypass device of the low voltage converter is characterized in that a bypass power supply device and a bypass power supply control device are arranged between the input end and the output end of the low voltage converter. When the low voltage converter has a fault, the motor and the low voltage converter can be disconnected through the bypass power supply control device, and the bypass power supply device is used for continuously supplying electricity for the motor so as to enable the motor to maintain the normal running. When abnormal conditions such as over current and the like exist on the motor, a thermal relay FR cuts off the power supply of the bypass power supply device to the motor so as to protect the motor, and a change-over switch SA in the bypass power supply control device can adopt three control models such as automatic control, manual control and stop, so as to control the bypass power supply device, thus being flexible and convenient, otherwise, for ensuring to be input into the bypass power supply safely and reliably, a block circuit is arranged for guaranteeing the safety of the converter.
Description
Technical field
Belong to the design of motor electric actuator.
Background technology
In Industry Control, low voltage frequency converter is commonly used to control motor speed, to satisfy needs energy-conservation and control.In Electric Machine Control, although the reliability of motor itself is higher, the low voltage frequency converter that is used for controlling motor speed can break down because of various reasons, in case break down, will cause motor to be shut down, and equipment is out of service, thereby brings economic loss to enterprise.For avoiding and reduce the fault that low voltage frequency converter brings, prior art adopts following method to solve usually: the one, dispose standby motor and frequency converter, and when frequency converter breaks down, enable standby motor and frequency converter; The 2nd, dispose the standby variable frequency device separately, in case during frequency converter failure, drop into the standby variable frequency device.Because frequency converter is to have than high technology content and comparatively complicated electric actuator, its price is higher relatively, and configuration standby variable frequency device will increase input, brings financial burden to enterprise.Therefore, be necessary prior art is improved.
Summary of the invention
For overcoming the prior art above shortcomings, the utility model provides low voltage frequency converter shunting device a kind of simple in structure, safe and reliable, practical, to solve the generation of the problems such as motor shutdown that frequency converter failure was brought.
The utility model provides a kind of like this low voltage frequency converter shunting device, comprise low voltage frequency converter and the motor that links to each other with low voltage frequency converter, it is characterized in that between low voltage frequency converter input and output, being provided with the bypass power supply device, the bypass power supply control device also is set simultaneously, when breaking down,, motor and low voltage frequency converter are broken away from by the bypass power supply control device with convenient low voltage frequency converter, continue power supply by the bypass power supply device to motor simultaneously, to keep the normal operation of motor.
Described bypass power supply device comprises that isolating switch QS2, contactor KM1, KM2's often opens main contact and thermal relay FR.
Described bypass power supply control device comprises relay K A1 and the indicator light X that links to each other with low voltage frequency converter 3 pin, the relay K A1 normally opened contact and the normally-closed contact that link to each other with power supply respectively, relay K A2 and normally opened contact thereof and normally-closed contact, contactor KM1 and normally closed interlock thereof, contactor KM2 and normally closed interlock thereof, the normally-closed contact of thermal relay FR also comprises change over switch SA, to be provided with automatically, manually and stop three kinds of control models, be used to control power supply, the power failure of bypass power supply device.
The utility model compared with prior art has following advantage and effect: adopt such scheme, can be when low voltage frequency converter breaks down, in time disconnect being connected of motor and low voltage frequency converter by the bypass power supply control device, change simultaneously by the bypass power supply device and continue power supply, to keep the normal operation of motor to motor.When abnormal conditions such as overcurrent occurring when motor,, cut off the bypass power supply device and power to motor by thermal relay FR; the protection motor; simultaneously by the change over switch SA in the bypass power supply control device, can adopt automatically, manually and stop three kinds of control models, the bypass power supply device is controlled; both flexible; convenient again, in addition, for guaranteeing to drop into safely and reliably bypass power supply; also be provided with locked loop, with the safety of protection frequency converter.
Description of drawings
Fig. 1 is the circuit structure diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
The low voltage frequency converter shunting device that the utility model provides, comprise low voltage frequency converter B and the motor M 1 that links to each other with low voltage frequency converter B, between the input of low voltage frequency converter B and output, the bypass power supply device is set, the bypass power supply control device also is set simultaneously, wherein, described bypass power supply device comprises isolating switch QS2, contactor KM1, KM2 often opens main contact, and thermal relay FR, described bypass power supply control device comprises relay K A1 and the indicator light X that links to each other with 3 pin of low voltage frequency converter B, the relay K A1 normally opened contact and the normally-closed contact that link to each other with power supply respectively, relay K A2 and normally opened contact thereof and normally-closed contact, contactor KM1 and normally closed interlock thereof, contactor KM2 and normally closed interlock thereof, the normally-closed contact of thermal relay FR, also comprise change over switch SA, as Fig. 1, the course of work is as follows: during startup, connect isolating switch QS2, QS1, it is electric that contactor KM1 coil is got, and KM1 often opens the main contact closure, and motor M 1 is turned round by low voltage frequency converter B power supply; Under automatic control mode, when low voltage frequency converter B is out of order, its 3 pin output HIGH voltage, relay K A1 coil is got, the normally-closed contact of KA1 disconnects simultaneously, make contactor KM1 coil losing electricity, thereby what disconnect KM1 in the bypass power supply device often opens main contact, motor M 1 and frequency converter B is broken away from, simultaneously the normally opened contact closure of relay K A1, relay K A2 coil is got, the normally opened contact closure of KA2, it is electric that contactor KM2 coil is got, the normally open contact self-locking of KM2, simultaneously in the bypass power supply device KM2 often open the main contact closure, make motor M 1 work as usual.When occurring overcurrent etc. in motor M 1 running when unusual, thermal relay FR work, the normally-closed contact of FR disconnects, and makes contactor KM2 coil losing electricity, and then the main contact of often opening of KM2 disconnects in the bypass power supply device, makes motor out of service and be protected.
Claims (3)
1. a low voltage frequency converter shunting device comprises low voltage frequency converter and the motor that links to each other with low voltage frequency converter, it is characterized in that being provided with between low voltage frequency converter input and output the bypass power supply device, and the bypass power supply control device also is set simultaneously.
2. low voltage frequency converter shunting device according to claim 1 is characterized in that described bypass power supply device comprises that isolating switch QS2, contactor KM1, KM2's often opens main contact and thermal relay FR.
3. low voltage frequency converter shunting device according to claim 1, it is characterized in that described bypass power supply control device comprises relay K A1 and the indicator light X that links to each other with low voltage frequency converter 3 pin, the relay K A1 normally opened contact and the normally-closed contact that link to each other with power supply respectively, relay K A2 and normally opened contact thereof and normally-closed contact, contactor KM1 and normally closed interlock thereof, contactor KM2 and normally closed interlock thereof, the normally-closed contact of thermal relay FR also comprises change over switch SA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202058403U CN202084982U (en) | 2011-06-17 | 2011-06-17 | Bypass device of low voltage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202058403U CN202084982U (en) | 2011-06-17 | 2011-06-17 | Bypass device of low voltage converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202084982U true CN202084982U (en) | 2011-12-21 |
Family
ID=45345599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202058403U Expired - Lifetime CN202084982U (en) | 2011-06-17 | 2011-06-17 | Bypass device of low voltage converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202084982U (en) |
-
2011
- 2011-06-17 CN CN2011202058403U patent/CN202084982U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111221 |
|
| CX01 | Expiry of patent term |