CN218771838U - Power frequency variable frequency switching control circuit with complementary function - Google Patents
Power frequency variable frequency switching control circuit with complementary function Download PDFInfo
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- CN218771838U CN218771838U CN202223285561.XU CN202223285561U CN218771838U CN 218771838 U CN218771838 U CN 218771838U CN 202223285561 U CN202223285561 U CN 202223285561U CN 218771838 U CN218771838 U CN 218771838U
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Abstract
The utility model discloses a take power frequency conversion switching control circuit of complementary function, it mainly includes: the control bypass, the power frequency fault bypass, the frequency conversion bypass and the frequency conversion fault bypass are electrically connected to two ends of the single-phase alternating current input, and are also connected with other circuits for indication, alarm and operation. The power frequency variable frequency switching control function and the complementary function are realized, the number of the relays and the alternating current contactors used in the power frequency variable frequency switching control function can be greatly reduced while the function is realized, and further the production and manufacturing cost and the subsequent maintenance difficulty and cost are reduced.
Description
Technical Field
The utility model relates to power frequency conversion switching control equipment/circuit field especially involves a take power frequency conversion switching control circuit of complementary function.
Background
The mechanical equipment has the conditions of full load and low load in the operation process, and the equipment works at power frequency under the conditions of full load or high load so as to ensure the efficiency under the condition of high load; under the condition of low load, the equipment is enabled to work under the frequency lower than the power frequency through the frequency converter/circuit, so that the electric energy is saved and the requirement of low load is met.
In order to ensure the normal operation and safety of the equipment, it is necessary to ensure that only one of the power frequency and the frequency conversion can be started at the same time, and that the current operation state is not affected by the other fault when the power frequency/frequency conversion operates. The existing solution is to set up a plurality of complementary functional devices (relays) to form a complementary circuit, but the existing control circuit is too complex, needs to use more relays to realize the complementary function, has higher production and manufacturing cost, and is also troublesome for subsequent overhaul and maintenance.
Therefore, there is a need for a power frequency conversion switching control circuit with complementary functions that can solve one or more of the above problems.
SUMMERY OF THE UTILITY MODEL
For solving one or more problems that exist among the prior art, the utility model provides a take power frequency conversion switching control circuit of complementary function. The utility model discloses a solve the technical scheme that above-mentioned problem adopted and be: the utility model provides a take power frequency conversion switching control circuit of complementary function, it includes: a control bypass electrically connected to the single-phase AC input, the control bypass comprising: the relay KA3, one end of a contact 1-9 of the relay KA3 is electrically connected with a first end of a single-phase alternating current input, the contact 1-9 of the relay KA3, a contact 2-1 of the switch SB2, a contact 4-3 of the switch SB1 and a contact A2-A1 of the relay KA2 are sequentially connected in series, and one end of a contact A2-A1 of the relay KA2 is electrically connected with a second end of the single-phase alternating current input;
the switch SB3 is connected to the first end of the single-phase alternating current input, the switch SB3 is provided with a 3-4 contact gear and a 1-2 contact gear, and the 3-4 contact gear is connected with the 1-2 contact gear in parallel;
a power frequency bypass connected between the 1-2 contact gear and the second end of the single-phase alternating current input, the power frequency bypass comprising: 2-10 contacts of the relay KA3, 10-6 contacts of the relay KA2, 22-21 contacts of the alternating current contactor KM1, A2-A1 contacts of the alternating current contactor KM2, 2-10 contacts of the relay KA3, 10-6 contacts of the relay KA2, 22-21 contacts of the alternating current contactor KM1 and A2-A1 contacts of the alternating current contactor KM2 are sequentially connected in series;
a power frequency fault bypass, the power frequency fault bypass in parallel with the power frequency bypass, the power frequency fault bypass comprising: the contact 6-10 of the relay KA3, the contact 98-97 of the thermal overload relay NR2 and the contact A2-A1 of the relay KA3, the contact 6-10 of the relay KA3 is connected with the contact 98-97 of the thermal overload relay NR2 in parallel, and the contact A2-A1 of the relay KA3 is connected with the contact 6-10 of the relay KA3 and the contact 98-97 of the thermal overload relay NR2 in series;
a variable frequency bypass connected between the 3-4 contact gear and a second end of the single phase AC input, the variable frequency bypass comprising: the contact 3-11 of the relay KA3, the contact 11-7 of the relay KA2, the contact 22-21 of the alternating current contactor KM2, the contact A2-A1 of the relay KA1 and the contact A2-A1 of the alternating current contactor KM1 are sequentially connected in series, the contact 3-11 of the relay KA3, the contact 11-7 of the relay KA2, the contact 22-21 of the alternating current contactor KM2 and the contact A2-A1 of the alternating current contactor KM1 are sequentially connected in series, and the contact A2-A1 of the relay KA1 is connected in parallel with the contact 22-21 of the alternating current contactor KM2 and the contact A2-A1 of the alternating current contactor KM 1;
a frequency conversion fault bypass, which is connected in series between the 3-4 contact position and the A2-A1 contact of the relay KM3, and comprises: the relay comprises a variable frequency fault input ALM1-ALM2 contact and 7-11 contacts of the relay KA3, wherein the variable frequency fault input ALM1-ALM2 contact is connected with the 7-11 contacts of the relay KA3 in parallel;
the A2-A1 contact of the relay KA1, the A2-A1 contact of the relay KA2, the A2-A1 contact of the relay KA3, the A2-A1 contact of the alternating current contactor KM1 and the A2-A1 contact of the alternating current contactor KM2 are power supply ends;
the alternating current contactor KM1 is a three-phase alternating current contactor for controlling variable frequency output, and the alternating current contactor KM2 is a three-phase alternating current contactor for controlling power frequency output.
In some embodiments, the single-phase AC input is electrically connected to a power indication circuit and an emergency stop switch.
In some embodiments, further comprising: the bypass is instructed to the power frequency, the power frequency instruct the bypass with switch SB 1's 4-3 contact the A2-A1 contact of relay KA2 is parallelly connected, the bypass is instructed to the power frequency includes: the relay KA 2's 9-5 contact, AC contactor KM 1's 14-13 contact, AC contactor KM 2's 14-13 contact, relay KA 1's 1-9 contact, power frequency indicator lamp, the relay KA 2's 9-5 contact one end with the switch SB 1's 4-3 contact one end is connected, the relay KA 2's 9-5 contact the other end with AC contactor KM 1's 14-13 contact, AC contactor's 14-13 contact one end is connected, AC contactor KM 1's 14-13 contact with AC contactor's 14-13 contact is parallelly connected, relay KA 1's 1-9 contact with power frequency indicator lamp establishes ties between AC contactor KM 1's 14-13 contact, AC contactor's 14-13 contact the other end and the second end of single phase current input.
In some embodiments, further comprising: a frequency conversion indication bypass, the frequency conversion indication bypass being connected in parallel with the A2-A1 contact of the relay KA2, the frequency conversion indication bypass comprising: 5-9 contact points of the relay KA1 and a variable frequency indicator lamp, wherein the 5-9 contact points of the relay KA1 are connected with the variable frequency indicator lamp in series.
In some embodiments, further comprising: a fault alarm indication bypass connected across the single phase ac input, the fault alarm indication bypass comprising: 5-9 contacts of the relay KA3 and a fault indicator lamp, wherein the 5-9 contacts of the relay KA3 are connected with the fault indicator lamp in series.
In some embodiments, further comprising: the frequency conversion operation output contact is connected with the 10-6 contacts of the relay KA1 in series, and the fault output contact is connected with the 8-12 contacts of the relay KA3 in series.
In some embodiments, further comprising: the frequency conversion state output contact, the 7-11 contacts of the relay KA1 and the 12-8 contacts of the relay KA2 are connected in series, and the power frequency state output contact, the 3-11 contacts of the relay KA1 and the 12-8 contacts of the relay KA2 are connected in series.
The utility model discloses the beneficial value who gains is: the utility model realizes the power frequency and frequency conversion switching and control by connecting the control bypass, the power frequency fault bypass, the frequency conversion fault bypass and other electric devices together; only one of power frequency or variable frequency can be started at the same time; when the power frequency operation is switched to the frequency conversion operation, both the power frequency operation and the frequency conversion operation are stopped, and when the frequency conversion operation is switched to the power frequency operation, both the power frequency operation and the frequency conversion operation are stopped; the frequency conversion fault protection has no influence on the power frequency operation during the power frequency operation, and the power frequency fault protection has no influence on the frequency conversion operation during the frequency conversion operation; the complementary function device that reduces to use only uses two AC contactor KM1 and KM2 that have a pair of normally open normally closed complementary contact, only uses three relays KA1, KA2 and KA3 that have four pairs of normally open normally closed complementary contacts, and then reduces the production manufacturing finished product to and can make things convenient for follow-up maintenance to overhaul. The utility model discloses a practical value has greatly improved above.
Drawings
Fig. 1 is a circuit block diagram of the present invention;
fig. 2 is a partial enlarged view I of the circuit block diagram of the present invention;
fig. 3 is a partial enlarged view II of the circuit block diagram of the present invention;
fig. 4 is a circuit block diagram of the frequency conversion operation output contact of the present invention;
fig. 5 is a circuit block diagram of the fault output contact of the present invention;
fig. 6 is a circuit block diagram of the state output contact of the present invention;
fig. 7 is a schematic diagram of contacts of the relay and the ac contactor according to the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms without departing from the spirit or essential characteristics thereof, and it should be understood that the invention is not limited to the embodiments disclosed herein.
As shown in fig. 1-7, the present invention discloses a power frequency conversion switching control circuit with complementary function, which comprises: a control bypass electrically connected to the single-phase AC input, the control bypass comprising: the relay KA3, one end of a contact 1-9 of the relay KA3 is electrically connected with a first end of a single-phase alternating current input, the contact 1-9 of the relay KA3, a contact 2-1 of the switch SB2, a contact 4-3 of the switch SB1 and a contact A2-A1 of the relay KA2 are sequentially connected in series, and one end of a contact A2-A1 of the relay KA2 is electrically connected with a second end of the single-phase alternating current input;
the switch SB3 is connected to the first end of the single-phase alternating current input, the switch SB3 is provided with a contact shift 3-4 and a contact shift 1-2, and the contact shift 3-4 is connected with the contact shift 1-2 in parallel;
a power frequency bypass connected between the 1-2 contact gear and the second end of the single-phase alternating current input, the power frequency bypass comprising: 2-10 contacts of the relay KA3, 10-6 contacts of the relay KA2, 22-21 contacts of the alternating current contactor KM1, A2-A1 contacts of the alternating current contactor KM2, 2-10 contacts of the relay KA3, 10-6 contacts of the relay KA2, 22-21 contacts of the alternating current contactor KM1 and A2-A1 contacts of the alternating current contactor KM2 are sequentially connected in series;
a power frequency fault bypass, the power frequency fault bypass in parallel with the power frequency bypass, the power frequency fault bypass comprising: 6-10 contacts of the relay KA3, 98-97 contacts of a thermal overload relay NR2 and A2-A1 contacts of the relay KA3, wherein the 6-10 contacts of the relay KA3 are connected with the 98-97 contacts of the thermal overload relay NR2 in parallel, and the A2-A1 contacts of the relay KA3 are connected with the 6-10 contacts of the relay KA3 and the 98-97 contacts of the thermal overload relay NR2 in series;
a variable frequency bypass connected between the 3-4 contact tap and a second end of the single phase AC input, the variable frequency bypass comprising: the contact 3-11 of the relay KA3, the contact 11-7 of the relay KA2, the contact 22-21 of the alternating current contactor KM2, the contact A2-A1 of the relay KA1 and the contact A2-A1 of the alternating current contactor KM1 are sequentially connected in series, the contact 3-11 of the relay KA3, the contact 11-7 of the relay KA2, the contact 22-21 of the alternating current contactor KM2 and the contact A2-A1 of the alternating current contactor KM1 are sequentially connected in series, and the contact A2-A1 of the relay KA1 is connected in parallel with the contact 22-21 of the alternating current contactor KM2 and the contact A2-A1 of the alternating current contactor KM 1;
a variable frequency fault bypass connected in series between the 3-4 contact position and the A2-A1 contact of the relay KM3, the variable frequency fault bypass comprising: the relay comprises a frequency conversion fault input ALM1-ALM2 contact and 7-11 contacts of the relay KA3, wherein the frequency conversion fault input ALM1-ALM2 contact is connected with the 7-11 contacts of the relay KA3 in parallel;
the A2-A1 contact of the relay KA1, the A2-A1 contact of the relay KA2, the A2-A1 contact of the relay KA3, the A2-A1 contact of the alternating current contactor KM1 and the A2-A1 contact of the alternating current contactor KM2 are power supply ends;
the alternating current contactor KM1 is a three-phase alternating current contactor for controlling variable frequency output, and the alternating current contactor KM2 is a three-phase alternating current contactor for controlling power frequency output.
As shown in fig. 1 and 2, a power supply indicating circuit and an emergency stop switch SB4 are electrically connected to the single-phase alternating-current input end, and the power supply indicating circuit comprises a power supply indicator lamp HL1.
As shown in fig. 1 and 2, the present invention further includes: the bypass is instructed to the power frequency, the power frequency instruct the bypass with switch SB 1's 4-3 contact, relay KA 2's A2-A1 contact is parallelly connected, the bypass is instructed to the power frequency includes: 9-5 contacts of relay KA2, 14-13 contacts of ac contactor KM1, 14-13 contacts of ac contactor KM2, 1-9 contacts of relay KA1, power frequency pilot lamp HL3, the one end of 9-5 contacts of relay KA2 with the one end of 4-3 contacts of switch SB1 is connected, the other end of 9-5 contacts of relay KA2 with 14-13 contacts of ac contactor KM1, the one end of 14-13 contacts of ac contactor is connected, 14-13 contacts of ac contactor KM1 with 14-13 contacts of ac contactor are parallelly connected, 1-9 contacts of relay KA1 with power frequency pilot lamp HL3 is established ties between 14-13 contacts of ac contactor KM1, the other end of 14-13 contacts of ac contactor and the second end of single phase alternating current input.
A frequency conversion indication bypass, the frequency conversion indication bypass being connected in parallel with the A2-A1 contact of the relay KA2, the frequency conversion indication bypass comprising: 5-9 contact, the frequency conversion pilot lamp HL4 of relay KA1, 5-9 contact and the frequency conversion pilot lamp HL4 of relay KA1 establish ties.
As shown in fig. 1 and 3, the present invention further includes: a fault alarm indication bypass connected across the single phase ac input, the fault alarm indication bypass comprising: 5-9 contact, the fault indicator HL2 of relay KA3, 5-9 contact and the fault indicator HL2 of relay KA3 establish ties.
As shown in fig. 4-5, the frequency conversion operation output contact is connected with the 10-6 contacts of the relay KA1 in series, and the fault output contact is connected with the 8-12 contacts of the relay KA3 in series.
As shown in fig. 6, the frequency conversion state output contact, the 7-11 contacts of the relay KA1, the 12-8 contacts of the relay KA2 are connected in series, and the power frequency state output contact, the 3-11 contacts of the relay KA1, and the 12-8 contacts of the relay KA2 are connected in series.
It should be noted that the switch SB3 is a normally open normally closed contact device, wherein the contact 1-2 is a power frequency gear, the contact 3-4 is a frequency conversion gear, and only one of the power frequency gear and the frequency conversion gear can be selected at the same time; when the power frequency is switched to the frequency conversion gear during operation, both the power frequency and the frequency conversion gear stop operating, and when the frequency conversion is switched to the power frequency gear during operation, both the power frequency and the frequency conversion gear stop operating, so that the complementary function of switching between the power frequency and the frequency conversion is realized.
The power frequency starts, and switch SB3 selects contact 1-2 shelves to switch to the power frequency state, and frequency conversion circuit does not have the electricity this moment, and relay KM1 and KA1 do not have the electricity, and the frequency conversion can not move. The starting switch SB1 is pressed down, the relay KA2 supplies power, contacts 6-10, 5-9 and 8-12 of the relay KA2 are all closed, the alternating current contactor KM2 obtains power supply through contacts 21-22 of the alternating current contactor KM1, contacts 13-14 of the alternating current contactor KM2 are closed to achieve starting self-locking power supply, the power frequency indicator lamp lights HL3, power frequency operation is achieved, and meanwhile, the power frequency state output contact is effective.
And (3) stopping power frequency, pressing a stop switch SB2, powering off the relay KA2, switching off contacts 5-9, 6-10 and 8-12 of the relay KA2, controlling the alternating current contactor KM2 to be powered off, stopping the power frequency, turning off a power frequency indicator lamp HL3, and simultaneously switching off the power frequency state output contact.
And (4) power frequency fault protection: when a fault occurs in power frequency operation, the contact 97-98 of the thermal overload relay NR2 is closed, the relay KA3 supplies power, the contact 6-10 of the relay KA3 is closed to realize self-locking power supply, the normally closed contacts 2-10 and 1-9 of the relay KA3 are disconnected, the relay KA2 and the alternating current contactor KM2 are powered off, the power frequency operation is stopped, the normally open contacts 5-9 and 8-12 of the relay KA3 are closed, the fault indicator lamp HL2 is on, and meanwhile, the fault output contact is effective. And 8-12 contacts of the relay KA2 are opened, and the power frequency state output contact is controlled to be opened.
The normally open contacts 6-10 of the fault relay KA3 realize self-locking power supply, so once the contacts 97-98 of the thermal overload relay NR2 are closed, the power frequency fault can be reported all the time, and the emergency stop switch SB4 can realize the function of recovering power frequency operation in power failure.
And (3) frequency conversion starting: switch SB3 selects contact 3-4 to shift to the frequency conversion state, and power frequency circuit does not have the electricity this moment, and alternating current contactor KM2 does not have the electricity, and the power frequency can not move. The starting switch SB1 is pressed, the relay KA2 supplies power, contacts 5-9, 7-11 and 8-12 of the relay KA2 are closed, the alternating current contactor KM1 is supplied with power through contacts 21-22 of the alternating current contactor KM2, the frequency conversion relay KA1 is supplied with power, contacts 13-14 of the alternating current contactor KM1 are closed to realize starting self-locking power supply, contacts 5-9, 6-10 and 7-11 of the frequency conversion relay KA1 are closed, the frequency conversion indicator lamp HL4 is on, frequency conversion operation is carried out, meanwhile, the frequency conversion state output contact is effective, and the frequency conversion operation output contact is effective.
And (3) stopping frequency conversion: when the stop button SB2 is pressed down, the relay KA2 is powered off, the contacts 5-9, 7-11 and 8-12 of the relay KA2 are all disconnected, the alternating current contactor KM1 and the relay KA1 are controlled to be powered off, the contacts 5-9, 6-10 and 7-11 of the variable frequency relay KA1 are all disconnected, the power frequency stops running, the variable frequency indicator lamp HL4 is turned off, meanwhile, the variable frequency state output contact is disconnected, and the variable frequency running output contact is disconnected.
Frequency conversion fault protection: when the frequency conversion operation fails, the frequency conversion fault input contacts ALM1-ALM2 are closed, the relay KA3 supplies power, the contacts 7-11 of the relay KA3 are closed to realize self-locking power supply, the normally closed contacts 3-11 and 1-9 of the relay KA3 are opened, the relays KA2 and KA1 and the alternating current contactor KM2 are powered off, the frequency conversion operation is stopped, the normally open contacts 5-9 and 8-12 of the relay KA3 are closed, the fault indicator lamp HL2 is on, and meanwhile the fault output contact is effective. And the contacts 8-12 of the relay KA2 are opened, the contacts 7-11 of the relay KA1 are opened, and the frequency conversion state output contacts are controlled to be opened. And (4) opening contacts 6-10 of the relay KA1, and controlling the frequency conversion operation output contacts to be opened.
The normally open contacts 7-11 of the fault relay KA3 realize self-locking power supply, so once the frequency conversion fault input contacts ALM1-ALM2 are closed, the frequency conversion fault can be reported all the time, and the emergency stop switch SB4 can realize the function of restoring the frequency conversion operation in power failure.
When the power frequency or variable frequency operation is carried out, the emergency stop switch SB4 is pressed down, all the devices are powered off and stop operating, and the function of emergency stop is realized.
The three-phase alternating current contactor KM1 controls the frequency converter to supply power to and cut off the power of the motor; the three-phase alternating current contactor KM2 controls a power grid to supply power to and cut off the power of the motor; three relay KA1, KA2 and KA3, each relay all have four groups normally open normally closed contact, and KA1 is frequency conversion relay, and KA2 is the start stop relay, and KA3 is the fault relay. The three-phase alternating-current contactors KM1 and KM2 are respectively provided with a set of normally open and normally closed contacts. The used devices are minimum, and only five main devices of KM1, KM2, KA1, KA2 and KA3 realize the power frequency variable frequency switching control circuit with complementary functions.
Starting self-locking: and the self-locking of power supply feedback is realized through the contacts 5-9 of the relay KA2 and the contacts 13-14 of KM1 and KM 2.
The power frequency operation indication and the frequency conversion operation indication complement functions: the indicating lamp display complementary function is realized through normally open and normally closed complementary contacts 1-9 and 5-9 of the relay KA1, only the power frequency or frequency conversion indicating lamp is turned on at the same time, and the power frequency or frequency conversion indicating lamp and the frequency conversion indicating lamp are not turned on at the same time.
Power frequency and frequency conversion switch complementary functions: the 2-gear selection switch SB3 is a device with a pair of normally-open normally-closed complementary contacts, the 1-2 gear of the selection contact is a power frequency gear, the 3-4 gear of the selection contact is a frequency conversion gear, and only one gear of the power frequency gear or the frequency conversion gear can be selected at the same time; when the power frequency is switched to the frequency conversion gear during operation, both the gears stop operating, and when the frequency conversion is switched to the power frequency gear during operation, both the gears stop operating, so that the power frequency and frequency conversion switching complementary function is realized.
The starting circuit and the fault alarm circuit have complementary functions: the complementary functions of the starting circuit and the fault alarm circuit are realized through normally-open normally-closed complementary contacts 1-9 and 5-9 of the relay KA3, only the starting circuit or the alarm circuit is powered to work at the same time, and the starting circuit or the alarm circuit is not powered to work at the same time.
Power frequency operation and power frequency fault complementation function: the power frequency operation and power frequency fault complementation function is realized through normally open normally closed complementary contacts 2-10 and 6-10 of the relay KA3, only power frequency operation or power frequency fault circuit is powered to work at the same time, and the power frequency operation or power frequency fault circuit is not powered to work at the same time.
Frequency conversion operation and frequency conversion fault complementation function: the normally open and normally closed complementary contacts 3-11 and 7-11 of the relay KA3 realize the complementary functions of frequency conversion operation and frequency conversion fault, only the frequency conversion operation or the frequency conversion fault circuit supplies power at the same time, and the two circuits do not simultaneously supply power.
Power frequency fault input self-locking: the power supply self-locking is realized through the contacts 6-10 of the relay KA3, once a power frequency fault is input, the fault power supply self-locking always keeps a fault alarm state, and the emergency stop switch SB4 realizes the function of recovering the fault self-locking in case of power failure.
Frequency conversion fault input self-locking: the power supply self-locking is realized through the contacts 7-11 of the relay KA3, once a frequency conversion fault is input, the fault power supply self-locking always keeps a fault alarm state, and the emergency stop switch SB4 realizes the function of recovering the fault self-locking in case of power failure.
Power frequency and frequency conversion complementary function: the power frequency three-phase alternating current contactor KM2 is connected with normally closed contacts 21-22 of the variable frequency alternating current contactor KM1 in series; the variable-frequency three-phase alternating current contactor KM1 is connected with normally closed contacts 21-22 of a power frequency alternating current contactor KM2 in series; the power frequency and frequency conversion complementary function is realized, only one of KM1 or KM2 can be powered at the same time, and KM1 and KM2 cannot be powered simultaneously, so that the power frequency and frequency conversion complementary function is realized.
Self-locking of fault output contacts: the power frequency fault and the frequency conversion fault share one fault relay KA3. When the fault relay KA3 has a power frequency fault, self-locking is realized through the KA3 contact 6-10; when the fault relay KA3 has a frequency conversion fault, self-locking is realized through KA3 contacts 7-11; therefore, no matter in power frequency fault or frequency conversion fault, the KA3 can realize self-locking power supply, and the fault output contact is controlled by the KA3 contacts 8-12, so that the fault output contact can realize the self-locking function.
The power frequency state output contact and the frequency conversion state output contact have complementary functions: the power frequency state output contact is controlled by serially connecting KA contacts 8-12 with KA1 contacts 3-11; the frequency conversion state output contact is controlled by connecting a KA2 contact 8-12 in series with a KA1 contact 7-11; the KA1 contacts 3-11 and 7-11 are a group of normally open normally closed contacts with complementary functions, the power frequency state output contact is effective or the frequency conversion state output contact is effective at the same time, and the power frequency state output contact and the frequency conversion state output contact cannot be effective at the same time, so that the power frequency state output contact and the frequency conversion state output contact can realize complementary functions.
The power frequency fault input and the frequency conversion fault input complement functions: the 2-gear selection switch SB3 is a device with a pair of normally-open and normally-closed complementary contacts, the 1-2 gear of the selection contact is a power frequency gear, and the 3-4 gear of the selection contact is a frequency conversion gear. When a power frequency gear is selected, the power frequency circuit is powered on, the frequency conversion circuit is powered off, the power frequency fault input is only effective to the power frequency operation, and the frequency conversion fault input is ineffective to the power frequency operation because of the power failure; when the frequency conversion gear is selected, the frequency conversion circuit is electrified, the power frequency circuit is not electrified, the frequency conversion fault input is only effective to the frequency conversion operation, and the power frequency fault input is ineffective to the frequency conversion operation because of the no electricity; and the complementary function of power frequency fault input and frequency conversion fault input is realized.
As shown in fig. 1 to 7, all the complementary functions and the self-locking function can be realized by only five devices, namely KM1, KM2, KA1, KA2 and KA3, and the devices are minimized. Wherein KM1 and KM2 respectively have a set of normally open normally closed contact, three relay KA1, KA2 and KA3, and each relay all has four sets of normally open normally closed contacts.
To sum up, the utility model realizes the power frequency and frequency conversion switching and control by connecting the control bypass, the power frequency fault bypass, the frequency conversion fault bypass and other electric devices together; only one of power frequency or variable frequency can be started at the same time; when the power frequency operation is switched to the frequency conversion, both the power frequency operation and the frequency conversion operation are stopped, and when the frequency conversion operation is switched to the power frequency operation, both the power frequency operation and the frequency conversion operation are stopped; the frequency conversion fault protection has no influence on the power frequency operation during the power frequency operation, and the power frequency fault protection has no influence on the frequency conversion operation during the frequency conversion operation; the complementary function device that reduces to use only uses two AC contactor KM1 and KM2 that have a pair of normally open normally closed complementary contact, only uses three relay KA1, KA2 and KA3 that only has four pairs of normally open normally closed complementary contact, and then reduces the production manufacturing finished product to and can make things convenient for follow-up maintenance and overhaul. The utility model discloses a practical value has greatly improved above.
The embodiments described above merely represent one or more embodiments of the present invention, which are described in detail and concrete, but cannot be understood as limitations of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. The utility model provides a power frequency conversion switching control circuit of complementary function in area which characterized in that includes: a control bypass electrically connected to the single-phase AC input, the control bypass comprising: the relay KA3, one end of a contact 1-9 of the relay KA3 is electrically connected with a first end of a single-phase alternating current input, the contact 1-9 of the relay KA3, a contact 2-1 of the switch SB2, a contact 4-3 of the switch SB1 and a contact A2-A1 of the relay KA2 are sequentially connected in series, and one end of a contact A2-A1 of the relay KA2 is electrically connected with a second end of the single-phase alternating current input;
the switch SB3 is connected to the first end of the single-phase alternating current input, the switch SB3 is provided with a contact shift 3-4 and a contact shift 1-2, and the contact shift 3-4 is connected with the contact shift 1-2 in parallel;
a power frequency bypass connected between the 1-2 contact gear and the second end of the single-phase alternating current input, the power frequency bypass comprising: 2-10 contacts of the relay KA3, 10-6 contacts of the relay KA2, 22-21 contacts of an alternating current contactor KM1, A2-A1 contacts of the alternating current contactor KM2, 2-10 contacts of the relay KA3, 10-6 contacts of the relay KA2, 22-21 contacts of the alternating current contactor KM1 and A2-A1 contacts of the alternating current contactor KM2 are sequentially connected in series;
a power frequency fault bypass, the power frequency fault bypass in parallel with the power frequency bypass, the power frequency fault bypass comprising: the contact 6-10 of the relay KA3, the contact 98-97 of the thermal overload relay NR2 and the contact A2-A1 of the relay KA3, the contact 6-10 of the relay KA3 is connected with the contact 98-97 of the thermal overload relay NR2 in parallel, and the contact A2-A1 of the relay KA3 is connected with the contact 6-10 of the relay KA3 and the contact 98-97 of the thermal overload relay NR2 in series;
a variable frequency bypass connected between the 3-4 contact tap and a second end of the single phase AC input, the variable frequency bypass comprising: the contact 3-11 of the relay KA3, the contact 11-7 of the relay KA2, the contact 22-21 of the alternating current contactor KM2, the contact A2-A1 of the relay KA1 and the contact A2-A1 of the alternating current contactor KM1 are sequentially connected in series, the contact 3-11 of the relay KA3, the contact 11-7 of the relay KA2, the contact 22-21 of the alternating current contactor KM2 and the contact A2-A1 of the alternating current contactor KM1 are sequentially connected in series, and the contact A2-A1 of the relay KA1 is connected in parallel with the contact 22-21 of the alternating current contactor KM2 and the contact A2-A1 of the alternating current contactor KM 1;
a variable frequency fault bypass connected in series between the 3-4 contact position and the A2-A1 contact of the relay KM3, the variable frequency fault bypass comprising: the relay comprises a variable frequency fault input ALM1-ALM2 contact and 7-11 contacts of the relay KA3, wherein the variable frequency fault input ALM1-ALM2 contact is connected with the 7-11 contacts of the relay KA3 in parallel;
the A2-A1 contact of the relay KA1, the A2-A1 contact of the relay KA2, the A2-A1 contact of the relay KA3, the A2-A1 contact of the alternating current contactor KM1 and the A2-A1 contact of the alternating current contactor KM2 are power supply ends;
the alternating current contactor KM1 is a three-phase alternating current contactor for controlling variable frequency output, and the alternating current contactor KM2 is a three-phase alternating current contactor for controlling power frequency output.
2. The power frequency variable frequency switching control circuit with the complementary function according to claim 1, wherein the single-phase alternating current input end is electrically connected with a power supply indicating circuit and an emergency stop switch.
3. The power frequency variable-frequency switching control circuit with the complementary function according to claim 1, wherein a power frequency indication bypass is connected in parallel with the 4-3 contact of the switch SB1 and the A2-A1 contact of the relay KA2, and the power frequency indication bypass comprises: the relay KA 2's 9-5 contact, AC contactor KM 1's 14-13 contact, AC contactor KM 2's 14-13 contact, relay KA 1's 1-9 contact, power frequency indicator lamp, the relay KA 2's 9-5 contact one end with the switch SB 1's 4-3 contact one end is connected, the relay KA 2's 9-5 contact the other end with AC contactor KM 1's 14-13 contact, AC contactor's 14-13 contact one end is connected, AC contactor KM 1's 14-13 contact with AC contactor's 14-13 contact is parallelly connected, relay KA 1's 1-9 contact with power frequency indicator lamp establishes ties between AC contactor KM 1's 14-13 contact, AC contactor's 14-13 contact the other end and the second end of single phase current input.
4. The power frequency variable frequency switching control circuit with complementary functions of claim 1 or 3, wherein a variable frequency indication bypass is connected in parallel with the A2-A1 contact of the relay KA2, and comprises: 5-9 contact points of the relay KA1 and a variable frequency indicator lamp, wherein the 5-9 contact points of the relay KA1 are connected with the variable frequency indicator lamp in series.
5. The power frequency variable frequency switching control circuit with the complementary function according to claim 1, wherein a fault alarm indication bypass is connected to two ends of the single-phase alternating current input, and the fault alarm indication bypass comprises: 5-9 contacts of the relay KA3 and a fault indicator lamp, wherein the 5-9 contacts of the relay KA3 are connected with the fault indicator lamp in series.
6. The power frequency variable frequency switching control circuit with complementary functions of claim 1, wherein a variable frequency operation output contact is connected in series with 10-6 contacts of the relay KA1, and a fault output contact is connected in series with 8-12 contacts of the relay KA3.
7. The power frequency variable frequency switching control circuit with complementary functions as claimed in claim 1, wherein the variable frequency state output contact, the 7-11 contacts of the relay KA1, the 12-8 contacts of the relay KA2 are connected in series, and the power frequency state output contact, the 3-11 contacts of the relay KA1, the 12-8 contacts of the relay KA2 are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223285561.XU CN218771838U (en) | 2022-12-07 | 2022-12-07 | Power frequency variable frequency switching control circuit with complementary function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223285561.XU CN218771838U (en) | 2022-12-07 | 2022-12-07 | Power frequency variable frequency switching control circuit with complementary function |
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| Publication Number | Publication Date |
|---|---|
| CN218771838U true CN218771838U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223285561.XU Active CN218771838U (en) | 2022-12-07 | 2022-12-07 | Power frequency variable frequency switching control circuit with complementary function |
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| Country | Link |
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| CN (1) | CN218771838U (en) |
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