CN209761820U - automatic start-stop control circuit for low-voltage variable frequency motor cooling fan - Google Patents
automatic start-stop control circuit for low-voltage variable frequency motor cooling fan Download PDFInfo
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- CN209761820U CN209761820U CN201920567075.6U CN201920567075U CN209761820U CN 209761820 U CN209761820 U CN 209761820U CN 201920567075 U CN201920567075 U CN 201920567075U CN 209761820 U CN209761820 U CN 209761820U
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Abstract
The utility model belongs to the electrical control circuit field, concretely relates to automatic control circuit that opens and stops of low pressure inverter motor cooling blower. The utility model discloses a temperature controller carries out temperature control, when the temperature surpassed the default after the frequency conversion host computer starts, temperature controller TKM's normally open contact is closed, first fan relay KM 0's coil is got the electricity, make cooling blower can the electric work of getting, provide the cooling air for the frequency conversion host computer, when the temperature is less than the default, the normally open contact of temperature controller resumes normally open state, thereby with the help of the coil disconnection of temperature controller TKM with first fan relay KM0, make cooling blower stop work, the automation of having realized cooling blower opens and stops, play energy-conserving effect, the waste of the energy has been avoided.
Description
Technical Field
the utility model belongs to the electrical control circuit field, concretely relates to automatic control circuit that opens and stops of low pressure inverter motor cooling blower.
Background
Low pressure inverter motor need dispose cooling blower and carry out supplementary heat dissipation, this cooling blower's automation is opened and is stopped and control through the temperature controller at present, control scheme is comparatively simple reliable, frequency conversion host computer heat dissipation capacity is big, its cooling scheme is with the help of cooling blower from the external cold air of drawing and sending in to the motor is inside to cool down, the inlet port has the filter screen to carry out simple filtration, but present automation is opened and is stopped control circuit and can not make cooling blower positive and negative rotation control, it has the branch to lead to the filter screen outside, debris such as leaf are adhered to, influence the air input cooling, need regularly manual clearance, certain maintenance cost's increase has also been caused.
SUMMERY OF THE UTILITY MODEL
the utility model discloses a solve the problem that exists among the above-mentioned prior art, the utility model provides an automatic control circuit that opens and stop of low pressure inverter motor cooling blower can open according to the temperature of setting for and open the cooling automatically, and through the reversal control circuit that sets up, realizes cooling blower's antiport for the inlet port switches for the exhaust in the short time, will adhere to the debris clearance outside the filter screen, improves the cleanliness of filter screen, improves the air input.
the utility model discloses a specific technical scheme be:
The automatic start-stop control circuit of the cooling fan of the low-voltage variable-frequency motor comprises a main loop and a control loop, wherein the main loop comprises a variable-frequency host, the cooling fan and a power supply, the cooling fan and the variable-frequency host are respectively connected with the power supply, the cooling fan is in on-off connection with the power supply by virtue of primary normally open contacts of a first fan relay KM0 and a second fan relay KM1 which are arranged in the main loop in parallel, the primary normally open contacts of the first fan relay KM0 and the second fan relay KM1 are opposite in phase sequence, the variable-frequency host is in on-off connection with the power supply by virtue of a frequency converter, a circuit breaker QF is also connected between the frequency converter and the power supply in series, and the control loop further comprises a selector switch S, a start button SBS, a coil of the first fan relay KM0 and a temperature controller TKM;
one end of the starting button SBS is connected with a live wire of the control power supply through a first contact of the selector switch S, and the other end of the starting button SBS is connected with a zero line of the control power supply after being connected with a coil of the first fan relay KM0 in series;
One end of a normally open contact of the temperature controller TKM is connected with a second contact of the selector switch S in series and then is connected with a live wire of a control power supply, and the other end of the normally open contact of the temperature controller TKM is connected between a starting button SBS and a coil of a first fan relay KM 0;
The secondary normally open contact of the first fan relay KM0 is connected in parallel with the start button SBS, and the first contact of the change-over switch S is opposite to the connection side of the second contact.
Control circuit still include clean button SBQ and second fan relay KM 1's coil, clean button SBQ establish ties between second fan relay KM 1's coil and control power's live wire, second fan relay KM 1's secondary normally open contact and clean button SBQ are parallelly connected, second fan relay KM 1's secondary normally closed contact establish ties between control power's zero line and first fan relay KM 0's coil.
The cleaning button SBQ and the starting button SBS are double control buttons including a group of normally open contacts and a group of normally closed contacts,
A normally open contact of the cleaning button SBQ is connected in series between a coil of the second fan relay KM1 and a control power supply, and a normally closed contact is connected in series between a normally open contact of the starting button SBS and a coil of the first fan relay KM 0;
the normally open contact of the start button SBS is connected in series between the coil of the first fan relay KM0 and the control power supply, and the normally closed contact is connected in series between the normally open contact of the cleaning button SBQ and the coil of the second fan relay KM 1.
The secondary normally closed contact of the first fan relay KM0 is connected in series between the coil of the second fan relay KM1 and the zero line of the control power supply, and the secondary normally closed contact of the second fan relay KM1 is connected in series between the coil of the first fan relay KM0 and the zero line of the control power supply.
The utility model has the advantages that:
The utility model discloses a temperature controller carries out temperature control, when the temperature surpassed the default after the frequency conversion host computer starts, temperature controller TKM's normally open contact is closed, first fan relay KM 0's coil is got the electricity, make cooling blower can the electric work of getting, provide the cooling air for the frequency conversion host computer, when the temperature is less than the default, the normally open contact of temperature controller resumes normally open state, thereby with the help of the coil disconnection of temperature controller TKM with first fan relay KM0, make cooling blower stop work, the automation of having realized cooling blower opens and stops, play energy-conserving effect, the waste of the energy has been avoided.
Drawings
FIG. 1 is a schematic diagram of the main circuit of the present invention;
FIG. 2 is a schematic diagram of a control circuit of the present invention;
Detailed Description
the present invention will be further explained with reference to the accompanying drawings and specific embodiments:
Concrete embodiment is as shown in fig. 1 and 2, the utility model relates to an automatic control circuit that stops that opens of low pressure inverter motor cooling blower, including main loop and control circuit, the main loop include frequency conversion host computer, cooling blower and power supply, cooling blower, frequency conversion host computer be connected with power supply respectively, cooling blower in the main loop first fan relay KM0 and the second fan relay KM1 that connect in parallel once normally open contact and power supply form the break-make and be connected, first fan relay KM0 and second fan relay KM1 once normally open contact and cooling blower between be connected opposite phase sequence, the frequency conversion host computer form the break-make with power supply with the help of the converter and be connected, converter and power supply between still establish ties and have circuit breaker QF, control circuit still include change over switch S, start button SBS, A coil of the first fan relay KM0 and a temperature controller TKM;
one end of the starting button SBS is connected with a live wire of the control power supply through a first contact of the selector switch S, and the other end of the starting button SBS is connected with a zero line of the control power supply after being connected with a coil of the first fan relay KM0 in series;
One end of a normally open contact of the temperature controller TKM is connected with a second contact of the selector switch S in series and then is connected with a live wire of a control power supply, and the other end of the normally open contact of the temperature controller TKM is connected between a starting button SBS and a coil of a first fan relay KM 0;
The secondary normally open contact of the first fan relay KM0 is connected in parallel with the start button SBS, and the first contact of the change-over switch S is opposite to the connection side of the second contact.
The utility model discloses at the during operation, at first inspection circuit connects, after confirming to connect correctly and not having the potential safety hazard, operating personnel closed circuit breaker QF to start the frequency conversion host computer switch and make the coil of auxiliary relay KA electric, the normally open contact series connection of auxiliary relay KA is between the common terminal and the corotation input of converter, the frequency conversion host computer starts after the normally open contact closure of KA, opening of frequency conversion host computer opens with cooling blower opens and stops mutual independence. When the change-over switch S is switched to the manual side as shown in the figure 2, the first contact is conducted, the second contact is disconnected, the start button SBS controls the start of the cooling fan, the button STB is responsible for cutting off the power supply of the cooling fan, after the start button SBS is pressed, the coil of the first fan relay KM0 is electrified, the secondary normally open contact of the first fan relay KM0 is closed to form self locking, the cooling fan is in the manual state at the moment, the working state is kept unchanged when the button STB is not pressed, the cooling fan cannot be started and stopped along with the temperature change in the motor well, when the change-over switch S is switched to the automatic side as shown in the figure 2, the first contact is disconnected, the second contact is closed, the cooling fan adopts a temperature controller TKM arranged in the motor well to automatically control the starting and stopping, when the temperature of the frequency conversion host exceeds a preset value, the coil of the first fan relay KM0 is, and the cooling fan is started, when the temperature of the frequency conversion host is lower than a preset value, the coil of the first fan relay KM0 loses power by means of the disconnection of the TKM normally open contact, and the cooling fan stops.
further, in order to blow away sundries attached to the filter screen, the control circuit further comprises a cleaning button SBQ and a coil of a second fan relay KM1, the cleaning button SBQ is connected in series between the coil of the second fan relay KM1 and a live wire of a control power supply, a secondary normally open contact of the second fan relay KM1 is connected in parallel with the cleaning button SBQ, and a secondary normally closed contact of the second fan relay KM1 is connected in series between a zero line of the control power supply and the coil of the first fan relay KM 0. In the main loop, the phase sequence of the connection between the primary normally open contacts of the first fan relay KM0 and the second fan relay KM1 and the cooling fan is opposite, so that the cooling fan can be started in a forward and reverse rotation manner, as shown in fig. 1, when the cooling fan rotates forwards, the cleaning button SBQ is not pressed at the moment, and the coil of the first fan relay KM0 is electrified, when the primary normally open contact is closed, the cooling fan is normally started to blow air into the motor, the phase sequence of the cooling fan is L3, L2 and L1 from left to right, when maintenance is required, the cleaning button SBQ is pressed, the coil of the second fan relay KM1 is energized, the normally open contact is closed once, so that phase sequence switching is completed, the cooling fan is started reversely, the phase sequence of the cooling fan is L1, L2 and L3 from left to right, air in the motor well flows reversely, air enters from the air outlet and is exhausted from the air inlet, the heat dissipation effect is also achieved, and impurities at the filter screen are blown away automatically.
furthermore, the cleaning button SBQ and the starting button SBS are double control buttons which comprise a group of normally open contacts and a group of normally closed contacts,
a normally open contact of the cleaning button SBQ is connected in series between a coil of the second fan relay KM1 and a control power supply, and a normally closed contact is connected in series between a normally open contact of the starting button SBS and a coil of the first fan relay KM 0;
the normally open contact of the start button SBS is connected in series between the coil of the first fan relay KM0 and the control power supply, and the normally closed contact is connected in series between the normally open contact of the cleaning button SBQ and the coil of the second fan relay KM 1.
The secondary normally closed contact of the first fan relay KM0 is connected in series between the coil of the second fan relay KM1 and the zero line of the control power supply, and the secondary normally closed contact of the second fan relay KM1 is connected in series between the coil of the first fan relay KM0 and the zero line of the control power supply.
with the help of clean button SBQ and start button SBS's mechanical interlocking and mutual electric interlocking, formed and prevented mistake and touched the structure, press clean button SBQ when needs are maintained for outside first fan relay KM 0's coil surely goes out the circuit, when needs start cooling blower, press start button SBS and surely go out the circuit with second fan relay KM1, avoid causing short-circuit fault, guaranteed the utility model discloses the safe orderly use of circuit.
As shown in fig. 2, the switch of the frequency conversion host machine has a manual control mode and an automatic control mode along with the difference of the gear positions of the change-over switch S, wherein in the manual control mode, the third contact of the change-over switch closes the fourth contact to be disconnected, the button SBB is switched on at the moment, the relay KA is started by pressing the button SBB, the normally open contact of KA and the button SBB form interlocking, the frequency converter is manually started at the moment, when the change-over switch S is switched to the automatic control mode, the third contact of the change-over switch opens the fourth contact to be closed, the PLC is switched in at the moment, the on-off control is performed through a preset program in the PLC, the planned on-off of KA is realized, the automatic start of the frequency conversion host machine is realized, and the cooling.
Claims (4)
1. Automatic control circuit that stops that opens of low pressure variable frequency motor cooling blower, including main loop and control circuit, the main loop include frequency conversion host computer, cooling blower and power supply, cooling blower, frequency conversion host computer be connected with power supply respectively, cooling blower with the help of in the main loop parallelly connected first fan relay KM0 that sets up and the one time normally open contact and the power supply of second fan relay KM1 form the break-make and be connected, the phase sequence of being connected between the one time normally open contact of first fan relay KM0 and second fan relay KM1 and the cooling blower is opposite, the frequency conversion host computer form the break-make with power supply with the help of the converter and be connected, converter and power supply between still establish ties and have circuit breaker QF, its characterized in that: the control loop further comprises a selector switch S, a starting button SBS, a coil of the first fan relay KM0 and a temperature controller TKM;
One end of the starting button SBS is connected with a live wire of the control power supply through a first contact of the selector switch S, and the other end of the starting button SBS is connected with a zero line of the control power supply after being connected with a coil of the first fan relay KM0 in series;
one end of a normally open contact of the temperature controller TKM is connected with a second contact of the selector switch S in series and then is connected with a live wire of a control power supply, and the other end of the normally open contact of the temperature controller TKM is connected between a starting button SBS and a coil of a first fan relay KM 0;
The secondary normally open contact of the first fan relay KM0 is connected in parallel with the start button SBS, and the first contact of the change-over switch S is opposite to the connection side of the second contact.
2. The automatic start-stop control circuit of the low-voltage variable frequency motor cooling fan according to claim 1, characterized in that: control circuit still include clean button SBQ and second fan relay KM 1's coil, clean button SBQ establish ties between second fan relay KM 1's coil and control power's live wire, second fan relay KM 1's secondary normally open contact and clean button SBQ are parallelly connected, second fan relay KM 1's secondary normally closed contact establish ties between control power's zero line and first fan relay KM 0's coil.
3. The automatic start-stop control circuit of the low-voltage variable frequency motor cooling fan according to claim 2, characterized in that: the cleaning button SBQ and the starting button SBS are double control buttons including a group of normally open contacts and a group of normally closed contacts,
A normally open contact of the cleaning button SBQ is connected in series between a coil of the second fan relay KM1 and a control power supply, and a normally closed contact is connected in series between a normally open contact of the starting button SBS and a coil of the first fan relay KM 0;
The normally open contact of the start button SBS is connected in series between the coil of the first fan relay KM0 and the control power supply, and the normally closed contact is connected in series between the normally open contact of the cleaning button SBQ and the coil of the second fan relay KM 1.
4. the automatic start-stop control circuit of the low-voltage variable frequency motor cooling fan according to claim 3, characterized in that: the secondary normally closed contact of the first fan relay KM0 is connected in series between the coil of the second fan relay KM1 and the zero line of the control power supply, and the secondary normally closed contact of the second fan relay KM1 is connected in series between the coil of the first fan relay KM0 and the zero line of the control power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920567075.6U CN209761820U (en) | 2019-04-24 | 2019-04-24 | automatic start-stop control circuit for low-voltage variable frequency motor cooling fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920567075.6U CN209761820U (en) | 2019-04-24 | 2019-04-24 | automatic start-stop control circuit for low-voltage variable frequency motor cooling fan |
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| Publication Number | Publication Date |
|---|---|
| CN209761820U true CN209761820U (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920567075.6U Active CN209761820U (en) | 2019-04-24 | 2019-04-24 | automatic start-stop control circuit for low-voltage variable frequency motor cooling fan |
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| CN (1) | CN209761820U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112217424A (en) * | 2020-09-27 | 2021-01-12 | 国电龙源节能技术有限公司上海分公司 | Cooling fan of medium-voltage frequency converter cabinet and control device and method of air conditioner |
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2019
- 2019-04-24 CN CN201920567075.6U patent/CN209761820U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112217424A (en) * | 2020-09-27 | 2021-01-12 | 国电龙源节能技术有限公司上海分公司 | Cooling fan of medium-voltage frequency converter cabinet and control device and method of air conditioner |
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