CN215719719U - Linkage control circuit for blower and power frequency exhaust fan in clean area of pharmaceutical factory - Google Patents
Linkage control circuit for blower and power frequency exhaust fan in clean area of pharmaceutical factory Download PDFInfo
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- CN215719719U CN215719719U CN202122217972.4U CN202122217972U CN215719719U CN 215719719 U CN215719719 U CN 215719719U CN 202122217972 U CN202122217972 U CN 202122217972U CN 215719719 U CN215719719 U CN 215719719U
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Abstract
The utility model discloses a linkage control circuit of a blower and a power frequency exhaust fan in a clean area of a pharmaceutical factory, which comprises a main loop and a secondary control circuit, wherein the power input end of the main loop is connected with an alternating current power supply, the power output end of the main loop is respectively connected with a variable frequency blower, a heat dissipation fan of the variable frequency blower and a plurality of power frequency exhaust fans, the secondary control circuit is used for generating switching control signals according to control instructions sent by a PLC (programmable logic controller), and the main loop realizes linkage control of the variable frequency blower, the heat dissipation fan of the variable frequency blower and the power frequency exhaust fans according to the switching control signals. The remarkable effects are as follows: the automatic linkage control and manual linkage control of the clean air conditioning variable-frequency air feeder and the power frequency exhaust fan in the clean area of the pharmaceutical factory are realized, the intelligent degree is high, the use effect is good, the economic benefit is obvious, the realization is convenient, the investment cost is low, and the popularization and application prospect is wide.
Description
Technical Field
The utility model relates to the technical field of linkage control of equipment in a clean area of a pharmaceutical factory, in particular to a linkage control circuit of a blower and a power frequency exhaust fan in the clean area of the pharmaceutical factory.
Background
In order to meet the requirements of pharmaceutical technology and respond to national energy-saving and emission-reduction policies, the variable-frequency fan is widely applied to pharmaceutical plants. The variable frequency speed regulation is known as one of the most ideal speed regulation modes with the greatest development prospect, and the frequency converter is adopted to form a variable frequency speed regulation transmission system, so that the first purpose is to meet the requirements of a clean air conditioning system and ensure the production quality of medicines; secondly, the production automation degree is improved, and the operation reliability of the system is ensured; thirdly, the energy is saved and the production and operation cost is reduced.
After the variable frequency speed regulation is adopted, the purification requirement of a clean air-conditioning system can be ensured, the operation and control system can be simplified, and the control level of equipment can be improved. When the motor or the power supply has faults, the frequency converter can actively report the faults and output on-off signals through the relay contacts. Meanwhile, the energy-saving effect of the fan-type load is very obvious, the power consumption of the fan-type load is proportional to the third power of the rotating speed, the frequency converter can carry out stepless speed regulation, when the average flow required by a user is small, the rotating speed of the fan and the rotating speed of the water pump are low, the energy-saving effect is very considerable, and the power saving rate can reach 20% -60%.
However, the original clean air conditioning system in the clean area of the pharmaceutical factory needs to be manually operated by a special line controller or a simple switch button to open or close the blower and the exhaust fan, and does not have linkage coordination with other linkage equipment to process the air in the current area, so that the intelligent degree of the blower unit is not high, the operation experience of users is poor, the control mode is single and not flexible, and building automation and intelligentization cannot be realized; meanwhile, the air feeder and the exhaust fan are controlled respectively, operation is complex, indoor airflow unified control is not facilitated, air volume balance cannot be guaranteed, requirements of a medicine production environment cannot be met, and finished medicine production products are unqualified.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a linkage control circuit for a blower and a power frequency exhaust fan in a clean area of a pharmaceutical factory, which can realize linkage control of a variable frequency blower and a power frequency exhaust fan of a clean air conditioner of a pharmaceutical factory building, and has the advantages of high intelligent degree and convenient operation.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a clean district forced draught blower of pharmaceutical factory and power frequency exhaust fan coordinated control circuit which the key lies in: including main loop and secondary control circuit, the power input end of main loop is connected with alternating current power supply, the power output end of main loop is connected with frequency conversion forced draught blower and radiator fan and a plurality of power frequency exhaust fan respectively, secondary control circuit is used for generating switching control signal according to the control command that the PLC controller sent, the main loop realizes the coordinated control of frequency conversion forced draught blower and radiator fan, power frequency exhaust fan according to switching control signal.
Furthermore, the main circuit comprises a power bus, a main circuit breaker, a first auxiliary circuit breaker, a plurality of second auxiliary circuit breakers, a frequency converter, a first contactor, a second contactor and a plurality of third contactors, the input ends of the main circuit breaker, the first auxiliary circuit breaker and the plurality of second auxiliary circuit breakers are all connected with the power bus, the output end of the main circuit breaker is connected with the input end of the frequency converter, the output end of the frequency converter is connected with the main contact of the first contactor in series and then is connected to the variable frequency blower, the output end of the first auxiliary breaker is connected with the main contact of the second contactor and the coil winding of the first thermal relay in series and then is connected with the heat radiation fan of the variable frequency blower, and the output end of the second auxiliary breaker is respectively connected with the main contact of the third contactor and the coil winding of the second thermal relay in series and then is connected with the exhaust fan in a one-to-one correspondence manner.
Further, the secondary control circuit comprises a first linkage control unit and a plurality of second linkage control units, wherein:
the input end of the first linkage control unit is connected with the output end of the over-current prevention unit, the input end of the over-current prevention unit is connected with a phase line of an alternating current power supply and used for generating a control signal according to a control instruction sent by a PLC (programmable logic controller) and carrying out linkage control on the variable frequency air feeder and a heat dissipation fan thereof;
and the input end of the second linkage control unit is connected with the output end of the over-current prevention unit and is used for generating a control signal according to a control instruction sent by the PLC controller so as to carry out linkage control on the power frequency exhaust fan.
Furthermore, the first linkage control unit comprises a first change-over switch, a first input end and a second input end of the first change-over switch are both connected with the output end of the overcurrent-preventing unit, the first output end of the first transfer switch is connected with a first normally open control switch of the PLC controller in series and then is connected with the input end of a normally closed switch of the first thermal relay, the second output end of the first change-over switch is connected with the first normally closed control switch and the first normally open button switch in sequence and then is connected with the input end of the normally closed switch of the first thermal relay, the output end of the normally closed switch of the first thermal relay is connected with the coil winding of the second contactor in series and then is connected with the central line of the alternating current power supply, one end of a second auxiliary contact of the second contactor is connected with the output end of the overcurrent prevention unit, and the other end of the second auxiliary contact of the second contactor is connected with the coil winding of the first indicating relay in series and then is connected with the central line of the alternating current power supply.
Further, first coordinated control unit still includes first operation pilot lamp, second operation pilot lamp, third operation pilot lamp and trouble lamp, first operation pilot lamp is used for right the operating condition of the radiator fan of frequency conversion forced draught blower instructs, second operation pilot lamp and third operation pilot lamp are used for right the converter operating condition of frequency conversion forced draught blower instructs, the trouble lamp is used for instructing the converter fault signal of frequency conversion forced draught blower, and is concrete:
the input end of the first operation indicator lamp is connected with the output end of a first auxiliary contact of the second contactor, the first auxiliary contact of the second contactor is connected with the first normally-open button switch in parallel, and the output end of the first operation indicator lamp is connected with the center line of the alternating current power supply;
the input end of the second operation indicator lamp is connected with the output end of the overcurrent-preventing unit after being connected in series with the first normally-open switch of the first indicator relay, and the output end of the second operation indicator lamp is connected with the central line of the alternating current power supply;
the input end of the third operation indicator lamp is connected with the output end of the overcurrent prevention unit after being connected with a normally open switch of a second indicator relay in series, the output end of the third operation indicator lamp is connected with the center line of the alternating current power supply, and two ends of a coil winding of the second indicator relay are connected with the digital signal output end group of the frequency converter;
the input end of the fault indicator lamp is connected with the output end of the overcurrent-preventing unit after being connected with a normally open switch of a third indicator relay in series, the output end of the fault operation indicator lamp is connected with the central line of the alternating current power supply, and two ends of a coil winding of the third indicator relay are connected with the fault signal output end group of the frequency converter.
Further, a coil winding of a fault control relay is connected in parallel to the fault indicator lamp, and the normally closed switch of the fault control relay is connected between the normally closed switch of the first thermal relay and the coil winding of the second contactor.
Furthermore, the first linkage control unit further comprises an emergency stop switch installed on the equipment site, the input end of the emergency stop switch is connected with the output end of the overcurrent prevention unit, the output end of the emergency stop switch is connected with the center line of the alternating current power supply after being connected with the coil winding of the first contactor in series, and the auxiliary contact of the first contactor is connected between the normally closed switch of the first thermal relay and the coil winding of the second contactor.
Furthermore, the second linkage control unit comprises a second change-over switch, a first input end of the second change-over switch is connected with an output end of the overcurrent prevention unit, a second input end of the second change-over switch is connected with an output end of the overcurrent prevention unit after being connected with a second normally open switch of the first indication relay in series, a first output end of the second change-over switch is connected with an input end of a normally closed switch of the second thermal relay after being connected with a second normally open control switch of the PLC controller in series, an output end of the normally closed switch of the second thermal relay is connected with a coil winding of the third contactor in series and then is connected with a central line of the alternating current power supply, and a second output end of the second change-over switch is connected with an input end of the normally closed switch of the second thermal relay after being connected with the second normally closed control switch and the second normally open button switch in sequence.
The utility model has the following remarkable effects: the circuit structure is simple, the use and the operation are simple and convenient, the automatic linkage control and the manual linkage control of the clean air conditioning variable-frequency air feeder and the power frequency exhaust fan in a clean area of a pharmaceutical factory are realized, the intelligent degree is high, the use effect is good, the economic benefit is obvious, the realization is convenient, the investment cost is low, and the popularization and application prospect is wide.
Drawings
FIG. 1 is a circuit schematic of the present invention;
FIG. 2 is a circuit schematic of the frequency converter;
fig. 3 is a circuit schematic of the secondary control circuit.
Detailed Description
The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a clean district forced draught blower and power frequency exhaust fan coordinated control circuit of pharmaceutical factory, including main loop 10 and secondary control circuit 20, the power input end and the alternating current power supply of main loop 10 are connected, the power output end of main loop 10 is connected with frequency conversion forced draught blower 30 and cooling fan 301 and a plurality of power frequency exhaust fan 40 respectively, secondary control circuit 20 is used for generating control signal according to the control command that the PLC controller sent, main loop 10 realizes frequency conversion forced draught blower 30 and cooling fan 301, power frequency exhaust fan 40's coordinated control according to switching control signal.
Referring to fig. 1, the main circuit 10 includes a power bus 11, a main breaker QF1, a first sub breaker QF2, a plurality of second sub breakers (QF 3.1-qf3. n), a frequency converter nBPQ, a first contactor nJX-KM, a second contactor nBPS-KM, and a plurality of third contactors (1 PF-KM-nPF-KM), wherein the input terminals of the main breaker QF1, the first sub breaker QF2, and the plurality of second sub breakers (QF 3.1-qf3. n) are connected to the power bus 11, the output terminal of the main breaker QF1 is connected to the input terminal of the frequency converter nBPQ, the output terminal of the frequency converter nBPQ is connected to the frequency converter blower 30 after being connected to the main contact of the first contactor nJX-KM in series, the output terminal of the first sub breaker 2 is connected to the main contact of the second contactor nBPS-KM in series and the heat dissipation fan 301 of the frequency converter 30 after being connected to the coil winding of the first thermal relay nBPS-KH, the output ends of the second auxiliary breakers (QF 3.1-QF 3.n) are respectively connected with the main contacts of the third contactors (1 PF-KM-nPF-KM) and the coil windings of the second thermal relays (1 PF-KH-nPF-KH) in series and then are correspondingly connected with the power frequency exhaust fan 40.
As shown in fig. 2 and 3, the secondary control circuit 20 includes a first linkage control unit 21 and a plurality of second linkage control units 22, wherein: the input end of the first linkage control unit 21 is connected with the output end of the over-current prevention unit FU, and the input end of the over-current prevention unit FU is connected with the phase line L of the alternating current power supply, and is used for generating a control signal according to a control instruction sent by a PLC controller and performing linkage control on the variable frequency blower 30 and the cooling fan 301 thereof; the second linkage control unit 22 is arranged in the control circuit of each power frequency exhaust fan 40, the input end of the second linkage control unit is connected with the output end of the overcurrent prevention unit FU, and the second linkage control unit is used for generating a control signal according to a control instruction sent by the PLC controller, and carrying out linkage control on the power frequency exhaust fans 40, specifically:
the first linkage control unit 21 comprises a first change-over switch 2SA, a first input end and a second input end of the first change-over switch 2SA are both connected with an output end of the over-current prevention unit FU, a first output end of the first change-over switch 2SA is connected with an input end of a normally closed switch of the first thermal relay nBPS-KH after being connected with a first normally open control switch S0 of a PLC in series, a second output end of the first change-over switch 2SA is connected with an input end of a normally closed switch of the first thermal relay nBPS-KH after being sequentially connected with a first normally closed control switch nBPS-SS and a first normally open button switch BPN-SB, an output end of the normally closed switch of the first thermal relay nBPS-KH is connected with a normally closed control switch YF of a fire prevention valve in series and a coil winding of the second contactor nBPS-KM in series and then is connected with a central line N of an alternating current power supply, one end of a second auxiliary contact of the second contactor nBPS-KM is connected with the output end of the over-current prevention unit FU, and the other end of the second auxiliary contact of the second contactor nBPS-KM is connected with a coil winding of the first indication relay nBPQ-KA1 in series and then is connected with a center line N of the alternating current power supply.
Further, the first linkage control unit 21 further includes a first operation indicator lamp nBPS-RD, a second operation indicator lamp nBPQ-RD, a third indicator lamp nBPQ-BD, and a fault indicator lamp nBPQ-YD, where the first operation indicator lamp nBPS-RD is used to indicate an operation state of the heat dissipation fan 301 of the variable frequency blower 30, the second operation indicator lamp nBPQ-RD and the third indicator lamp nBPQ-BD are used to indicate an operation state of the inverter nBPQ of the variable frequency blower 30, and the fault indicator lamp nBPQ-YD is used to indicate a fault signal of the inverter nBPQ of the variable frequency blower 30, specifically:
the input end of the first operation indicator lamp nBPS-RD is connected with the output end of the first auxiliary contact of the second contactor nBPS-KM, the first auxiliary contact of the second contactor nBPS-KM is connected with the first normally-open button switch nBPS-SB in parallel, and the output end of the first operation indicator lamp nBPS-RD is connected with the center line N of the alternating current power supply; through the circuit, when the heat radiation fan 301 of the variable frequency blower 30 is powered on to work, the first operation indicator lamp nBPS-RD emits light for indication;
the input end of the second operation indicator lamp nBPQ-RD is connected with the output end of the over-current prevention unit FU after being connected in series with a first normally open switch of a first indicator relay nBPQ-KA1, the output end of the second operation indicator lamp nBPQ-RD is connected with the center line N of the alternating current power supply, one end of a coil winding of the first indicator relay nBPQ-KA1 is connected with the output end of the over-current prevention unit FU through a second auxiliary contact of a second contactor nBPS-KM, and the other end of the coil winding of the first indicator relay FU-KA 1 is connected with the center line N of the alternating current power supply FU; when the variable-frequency blower 30 works, a second auxiliary contact of the second contactor nBPS-KM is closed, a coil winding of the first indicating relay nBPQ-KA1 is electrified, a first normally open switch of the first indicating relay nBPQ-KA1 is closed, and the second operation indicating lamp nBPQ-RD emits light for indication;
the input end of the third operation indicator lamp nBPQ-BD is connected with the output end of the overcurrent-preventing unit FU after being connected in series with a normally open switch of a second indicator relay nBPQ-J1, the output end of the third operation indicator lamp nBPQ-BD is connected with the center line N of an alternating current power supply, and two ends of a coil winding of the second indicator relay nBPQ-J1 are connected with the digital signal output end group of the frequency converter nBPQ; when the variable-frequency blower 30 works and the frequency converter reaches a given frequency, a coil winding of a second indication relay nBPQ-J1 is electrified, and a third operation indication lamp nBPQ-BD emits light for indication;
the input end of the fault indicator lamp nBPQ-YD is connected with a normally open switch of a third indicator relay nBPQ-J2 in series and then is connected with the output end of the over-current prevention unit FU, the output end of the fault operation indicator lamp nBPQ-YD is connected with the central line N of an alternating current power supply, and two ends of a coil winding of the third indicator relay nBPQ-J2 are connected with a fault signal output end group of the frequency converter nBPQ; when the frequency converter nBPQ sends a fault signal, a coil winding of the third indicating relay nBPQ-J2 is electrified, a normally open switch of the third indicating relay is closed, and a fault indicating lamp nBPQ-YD is lightened for indicating.
Still further, a coil winding of a fault control relay nBPQ-KA2 is connected in parallel to the fault indicator lamp nBPQ-YD, and a normally closed switch of the fault control relay nBPQ-KA2 is connected between a normally closed switch of the first thermal relay nBPS-KH and the coil winding of the second contactor nBPS-KM, so that a power circuit of the variable frequency blower 30 is cut off in time when a fault occurs.
Furthermore, the first linkage control unit 21 further comprises an emergency shutdown switch nSB-1JS installed on the site of the equipment, the input end of the emergency shutdown switch nSB-1JS is connected with the output end of the overcurrent prevention unit FU, the output end of the emergency shutdown switch nSB-1JS is connected with the center line N of the alternating current power supply after being connected with the coil winding of the first contactor nJX-KM in series, and the auxiliary contact of the first contactor nJX-KM is connected between the normally closed switch of the first thermal relay nBPS-KH and the coil winding of the second contactor nBPS-KM. Through the circuit, emergency stop (overhaul) operation is required on the equipment site, and the emergency stop switch nSB-1JS can be pressed down to cut off the power supply of the variable frequency blower 30.
In this embodiment, the circuit can also realize the electric heating and humidification linkage control of the heat dissipation fan 301 of the variable frequency blower 30, and the specific circuit includes an electric heating switch DJR, an electric humidification switch DJS and a feedback interlocking intermediate relay DJ-KA, wherein after being connected in parallel, one end of the electric heating switch DJR and the electric humidification switch DJS is connected with the output end of the over-current prevention unit FU, the other end of the electric heating switch DJR and the electric humidification switch DJS is connected with the center line N of the alternating current power supply through a coil winding of the feedback interlocking intermediate relay DJ-KA, one end of a normally open switch of the feedback interlocking intermediate relay DJ-KA is connected with the output end of the over-current prevention unit FU, and the other end of the normally closed switch of the first thermal relay nBPS-KH is connected with the input end of the normally closed switch of the first thermal relay nBPS-KH.
As can be further seen from fig. 3, the second linkage control unit 22 includes a second transfer switch (1 PF-SA-nPF-SA), a first input terminal of the second transfer switch (1 PF-SA-nPF-SA) is connected to the output terminal of the over-current preventing unit FU, a second input terminal thereof is connected to the output terminal of the over-current preventing unit FU after being connected in series with the normally open switch of the first indication relay, a first output terminal thereof is connected to the input terminal of the normally closed switch of the second thermal relay (1 PF-KH-nPF-KH) after being connected to the second normally open control switch S1 of the PLC controller in series, an output terminal of the normally closed switch of the second thermal relay (1 PF-KH-nPF-KH) is connected to the center line N of the ac power supply after being connected to the coil winding of the third contactor (1 PF-KM-nPF-KM) in series, the second output end of the first thermal relay is connected with a second normally closed control switch (1 PF-SS-nPF-SS) and a second normally open push-button switch (1 PF-SSB-nPF-SB) in sequence and then is connected with the input end of the normally closed switch of the second thermal relay (1 PF-KH-nPF-KH).
The circuit can realize automatic linkage control and manual linkage control of the clean air-conditioning variable-frequency air feeder 30 and the power-frequency exhaust fan 40 in a clean area of a pharmaceutical factory, and the change-over switches 2SA and 1 PF-SA-nPF-SA are turned to linkage gears in an automatic linkage control mode, and at the moment, the variable-frequency air feeder 30 and the power-frequency exhaust fan 40 run in a linkage mode through a control interface of a PLC (programmable logic controller) of an air-conditioning automatic control system; in the manual linkage control mode, the change-over switches 2SA and 1 PF-SA-nPF-SA are switched to manual gears, and linkage operation of the blower 30 and the power frequency exhaust fan 40 is realized through electric linkage.
The start and stop sequence of the air feeder and the exhaust fan in the pharmaceutical factory building is as follows: when the machine is started, the blower 30 is started first, and then the working frequency exhaust fan 40 is started; when the machine is stopped, the ventilator 40 is stopped first, and then the blower 30 is stopped. Therefore, the manual control loop of the power frequency exhaust fan 40 is electrically interlocked through the auxiliary contact of the nBPQ-KA1 contactor, so that the condition that the blower 30 must operate when the power frequency exhaust fan 40 operates is ensured; when the machine is stopped, the blower 30 stops running, and the power frequency exhaust fan 40 also needs to stop running, so that misoperation is prevented.
Finally, in each control circuit of the exhaust fan, "n" represents "power consumption equipment number". If no PLC automatic control system exists, the 2SA change-over switch, the loop and the contact are cancelled; the contactor nBPQ-KA1 adopts a normally open auxiliary contact; if all the exhaust fans share one PLC start-stop signal, an intermediate relay is added, and meanwhile, the normally open contact of the intermediate relay replaces the PLC linkage control contact of each exhaust fan; if there is no such element in the primary system diagram, the loop is cancelled, and the first contactor nJX-KM in the primary loop 10 and the secondary control circuit 20 is cancelled.
The technical solution provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a clean district forced draught blower of pharmaceutical factory and power frequency exhaust fan coordinated control circuit which characterized in that: including main loop and secondary control circuit, the power input end of main loop is connected with alternating current power supply, the power output end of main loop is connected with frequency conversion forced draught blower and radiator fan and a plurality of power frequency exhaust fan respectively, secondary control circuit is used for generating control signal according to the control command that the PLC controller sent, the main loop realizes the coordinated control of frequency conversion forced draught blower and radiator fan, power frequency exhaust fan according to control signal.
2. The linkage control circuit of the blower and the power frequency exhaust fan in the clean area of the pharmaceutical factory according to claim 1, characterized in that: the major loop includes power bus, main circuit breaker, first vice circuit breaker, the vice circuit breaker of a plurality of second, converter, first contactor, second contactor and a plurality of third contactor, the input of main circuit breaker, first vice circuit breaker and the vice circuit breaker of a plurality of second all with power bus connects, the output of main circuit breaker with the input of converter links to each other, the output of converter concatenates behind the main contact of first contactor and is connected to the frequency conversion forced draught blower, the output of first vice circuit breaker concatenate behind the main contact of second contactor, the coil winding of first thermal relay with the cooling blower of frequency conversion links to each other, the output of the vice circuit breaker of second concatenates respectively behind the main contact of third contactor, the coil winding of second thermal relay with the exhaust fan one-to-one is connected.
3. The linkage control circuit of the blower and the power frequency exhaust fan in the clean area of the pharmaceutical factory according to claim 2, characterized in that: the secondary control circuit comprises a first linkage control unit and a plurality of second linkage control units, wherein:
the input end of the first linkage control unit is connected with the output end of the over-current prevention unit, the input end of the over-current prevention unit is connected with a phase line of an alternating current power supply and used for generating a control signal according to a control instruction sent by a PLC (programmable logic controller) and carrying out linkage control on the variable frequency air feeder and a heat dissipation fan thereof;
and the input end of the second linkage control unit is connected with the output end of the over-current prevention unit and is used for generating a control signal according to a control instruction sent by the PLC controller so as to carry out linkage control on the power frequency exhaust fan.
4. The linkage control circuit of the blower and the power frequency exhaust fan in the clean area of the pharmaceutical factory according to claim 3, characterized in that: the first linkage control unit comprises a first change-over switch, the first input end and the second input end of the first change-over switch are both connected with the output end of the overcurrent-preventing unit, the first output end of the first transfer switch is connected with a first normally open control switch of the PLC controller in series and then is connected with the input end of a normally closed switch of the first thermal relay, the second output end of the first change-over switch is connected with the first normally closed button switch and the first normally open button switch in sequence and then is connected with the input end of the normally closed switch of the first thermal relay, the output end of the normally closed switch of the first thermal relay is connected with the coil winding of the second contactor in series and then is connected with the neutral line of the alternating current power supply, one end of a second auxiliary contact of the second contactor is connected with the output end of the overcurrent prevention unit, and the other end of the second auxiliary contact of the second contactor is connected with a coil winding of the first indicating relay in series and then is connected with a neutral line of the alternating-current power supply.
5. The linkage control circuit of the blower and the power frequency exhaust fan in the clean area of the pharmaceutical factory according to claim 4, characterized in that: first coordinated control unit still includes first operation pilot lamp, second operation pilot lamp, third operation pilot lamp and trouble pilot lamp, first operation pilot lamp is used for right the operating condition of the radiator fan of frequency conversion forced draught blower instructs, second operation pilot lamp is used for right with the third operation pilot lamp the converter operating condition of frequency conversion forced draught blower instructs, the trouble pilot lamp is used for instructing the converter fault signal of frequency conversion forced draught blower, and is concrete:
the input end of the first operation indicator lamp is connected with the output end of a first auxiliary contact of the second contactor, the first auxiliary contact of the second contactor is connected with the first normally-open button switch in parallel, and the output end of the first operation indicator lamp is connected with a neutral line of an alternating current power supply;
the input end of the second operation indicator lamp is connected with the output end of the overcurrent-preventing unit after being connected in series with the first normally-open switch of the first indicator relay, and the output end of the second operation indicator lamp is connected with the neutral line of the alternating-current power supply;
the input end of the third operation indicator lamp is connected with the output end of the overcurrent prevention unit after being connected with a normally open switch of a second indicator relay in series, the output end of the third operation indicator lamp is connected with a neutral wire of an alternating current power supply, and two ends of a coil winding of the second indicator relay are connected with the digital signal output end group of the frequency converter;
the input end of the fault indicator lamp is connected with the output end of the overcurrent prevention unit after being connected with a normally open switch of a third indicator relay in series, the output end of the fault operation indicator lamp is connected with a neutral line of an alternating current power supply, and two ends of a coil winding of the third indicator relay are connected with the fault signal output end group of the frequency converter.
6. The linkage control circuit of the blower and the power frequency exhaust fan in the clean area of the pharmaceutical factory according to claim 5, characterized in that: and the fault indicator lamp is connected with a coil winding of a fault control relay in parallel, and the normally closed switch of the fault control relay is connected between the normally closed switch of the first thermal relay and the coil winding of the second contactor.
7. The linkage control circuit of the blower and the power frequency exhaust fan in the clean area of the pharmaceutical factory according to claim 4 or 6, characterized in that: the first linkage control unit further comprises an emergency stop switch installed on the equipment site, the input end of the emergency stop switch is connected with the output end of the overcurrent prevention unit, the output end of the emergency stop switch is connected with a coil winding of the first contactor in series and then is connected with a neutral line of an alternating current power supply, and an auxiliary contact of the first contactor is connected between a normally closed switch of the first thermal relay and a coil winding of the second contactor.
8. The linkage control circuit of the blower and the power frequency exhaust fan in the clean area of the pharmaceutical factory according to claim 4, characterized in that: the second linkage control unit comprises a second change-over switch, a first input end of the second change-over switch is connected with an output end of the overcurrent-preventing unit, a second input end of the second change-over switch is connected with an output end of the overcurrent-preventing unit after being connected with a second normally-open switch of the first indication relay in series, a first output end of the second change-over switch is connected with an input end of a normally-closed switch of the second thermal relay after being connected with a second normally-open control switch of the PLC controller in series, an output end of the normally-closed switch of the second thermal relay is connected with a coil winding of the third contactor in series and then is connected with a neutral line of the alternating current power supply, and a second output end of the second change-over switch is connected with an input end of the normally-closed switch of the second thermal relay after being connected with the second normally-closed button switch and the second normally-open button switch in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122217972.4U CN215719719U (en) | 2021-09-14 | 2021-09-14 | Linkage control circuit for blower and power frequency exhaust fan in clean area of pharmaceutical factory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122217972.4U CN215719719U (en) | 2021-09-14 | 2021-09-14 | Linkage control circuit for blower and power frequency exhaust fan in clean area of pharmaceutical factory |
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| Publication Number | Publication Date |
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| CN215719719U true CN215719719U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122217972.4U Active CN215719719U (en) | 2021-09-14 | 2021-09-14 | Linkage control circuit for blower and power frequency exhaust fan in clean area of pharmaceutical factory |
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| Country | Link |
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| CN (1) | CN215719719U (en) |
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