CN217332570U - Control circuit for high-power RC load - Google Patents
Control circuit for high-power RC load Download PDFInfo
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- CN217332570U CN217332570U CN202220739035.7U CN202220739035U CN217332570U CN 217332570 U CN217332570 U CN 217332570U CN 202220739035 U CN202220739035 U CN 202220739035U CN 217332570 U CN217332570 U CN 217332570U
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Abstract
The utility model relates to a RC load technical field discloses a control circuit for high-power RC load, aims at solving the higher problem of failure rate of contactor among the current RC load control circuit, and the scheme mainly includes: the RC load comprises a resistor and at least one capacitor, the resistor and the at least one capacitor are connected in parallel, and the circuit comprises: first contactor, second contactor, third contactor, first relay, second relay, third relay, fourth relay and controller, the controller includes signal input port, first signal output port, second signal output port and third signal output port, third contactor, third relay, third signal output port are the same with the quantity of electric capacity to third contactor, third relay, third signal output port and electric capacity one-to-one. The utility model discloses reduce the failure rate of contactor, the high-power RC load of specially adapted.
Description
Technical Field
The utility model relates to a RC load technical field relates to a control circuit for high-power RC load particularly.
Background
In the test of UPS products, a linear RC load with adjustable power factor must be used, but because of its loud noise and large heat generation, it is usually located in a fixed area far away from the product to be tested, and at this time, a remote control is needed, and a contactor is a switch control device that must be used.
The C load in the RC load belongs to an energy storage type capacitor load, when the C load is switched on and off by the contactor, electric arcs can appear at two ends of a contact, the contactor is prone to failure, and arc extinguishing specifications and increasing contactor current specifications cannot be adopted on the premise that cost and space are limited.
In order to meet the requirement of testing various power levels, the load has power of a plurality of gears, for example, a 3-phase alternating current RC load of 300Kvar, at least each phase has 12 gears, and 36 gears are needed in total, so that 36 contactors with different power are needed, the probability of simultaneous use of all gears is low, but delay exists in the on-off of the gear contactors, and the set load power cannot be instantly input.
The RC load design inherent characteristics are: the rated current of the main circuit is far larger than that of the gear contactor. When the contactor is used in practice, the full-power use probability is small, however, the on-off times of the contactor at a small gear are the largest, and the failure rate is very high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a control circuit for high-power RC load, make it can solve the problem that the contactor failure rate is high after adding corresponding software method.
The utility model provides a technical scheme that above-mentioned technical problem adopted is: a control circuit for a high power RC load, said RC load comprising a resistor and at least one capacitor, said resistor and at least one capacitor being connected in parallel, the circuit comprising: the controller comprises a signal input port, a first signal output port, a second signal output port and a third signal output port, the number of the third contactor, the third relay and the third signal output port is the same as that of capacitors, and the third contactor, the third relay and the third signal output port are in one-to-one correspondence with the capacitors;
the first signal output port is grounded through a coil of the first relay and a coil of the fourth relay in sequence, the second signal output port is grounded through a coil of the second relay, the third signal output port is grounded through a corresponding coil of the third relay, the signal input port is connected with the voltage input end through a normally open contact of the fourth relay, one end of the coil of the first contactor is connected with a commercial power live wire through the normally open contact of the first relay, the other end of the coil of the first contactor is connected with the commercial power zero line, one end of the coil of the second contactor is connected with the commercial power live wire through the normally open contact of the second relay, the other end of the coil of the second contactor is connected with the commercial power zero line, one end of the coil of the third contactor is connected with the commercial power live wire through the normally open contact of the corresponding third relay, and the other end of the coil of the third contactor is connected with the commercial power zero line, one end of the resistor is connected with a live wire of the commercial power sequentially through a normally open contact of the second contactor and a normally open contact of the first contactor, the other end of the resistor is connected with a zero line of the commercial power, and the capacitor is connected with a normally open contact of the corresponding third contactor in series.
Further, still include: and the prompting module is connected with a fourth signal output port of the controller.
Further, the controller model is CPUST 30.
Further, the model of the first relay, the second relay and the third relay is MYSN-GS.
Further, the first contactor has a model number of NXC-18, and the second and third contactors have a model number of NXC-9.
The utility model has the advantages that: a control circuit for high-power RC load, after having used corresponding software method, detect the on-state of the normally open contact of first contactor through setting up the fourth relay to only when the normally open contact of first contactor is in the off-state, just can control the on-state or the disconnection of the normally open contact of second contactor and third contactor, not only can reduce load power's delay time, satisfy the instantaneous loaded demand of load, can also realize the protection to the contactor, reduce the failure rate of contactor.
Drawings
Fig. 1 is a first schematic structural diagram of a control circuit for a high-power RC load according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram ii of a control circuit for a high-power RC load according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram three of a control circuit for a high-power RC load according to an embodiment of the present invention;
description of reference numerals:
l-live line of mains supply; n-mains supply zero line; r1-resistance; c1-capacitance; a PLC-controller; q0-first signal output port; q1-second signal output port; q2-a third signal output port; IO-signal input port; KM 1-first contactor; KM 2-second contactor; KM 3-third contactor; KA01 — first relay; KA02 — second relay; KA 03-third relay.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The utility model aims at providing a control circuit for high-power RC load, the RC load includes a resistance and at least one electric capacity, resistance and at least one electric capacity are parallelly connected, and this circuit includes: the controller comprises a signal input port, a first signal output port, a second signal output port and a third signal output port, the number of the third contactor, the third relay and the third signal output port is the same as that of capacitors, and the third contactor, the third relay and the third signal output port are in one-to-one correspondence with the capacitors; the first signal output port is grounded through a coil of the first relay and a coil of the fourth relay in sequence, the second signal output port is grounded through a coil of the second relay, the third signal output port is grounded through a corresponding coil of the third relay, the signal input port is connected with the voltage input end through a normally open contact of the fourth relay, one end of the coil of the first contactor is connected with a commercial power live wire through the normally open contact of the first relay, the other end of the coil of the first contactor is connected with the commercial power zero line, one end of the coil of the second contactor is connected with the commercial power live wire through the normally open contact of the second relay, the other end of the coil of the second contactor is connected with the commercial power zero line, one end of the coil of the third contactor is connected with the commercial power live wire through the normally open contact of the corresponding third relay, and the other end of the coil of the third contactor is connected with the commercial power zero line, one end of the resistor is connected with a live wire of the commercial power sequentially through a normally open contact of the second contactor and a normally open contact of the first contactor, the other end of the resistor is connected with a zero line of the commercial power, and the capacitor is connected with a normally open contact of the corresponding third contactor in series.
After the corresponding software method is applied, a user can load and unload the RC load by sending a corresponding instruction to the controller, namely, the controller can be used for controlling the on/off of the normally open contacts of the contactors, specifically, when a first signal output port of the controller outputs a high level signal, coils of the first relay and the fourth relay are electrified, the normally open contacts of the first relay and the fourth relay are closed, after the normally open contact of the first relay is closed, the coil of the first contactor is electrified, the normally open contact of the first contactor is closed, when a first signal output port of the controller outputs a low level signal, the coils of the first relay and the fourth relay are powered off, the normally open contacts of the first relay and the fourth relay are disconnected, and after the normally open contact of the first relay is disconnected, the coil of the first contactor is powered off, and the normally open contact of the first contactor is opened. Similarly, the normally open contacts of the second contactor and the third contactor are switched on and off by outputting high and low levels through a second signal output port and a third signal output port of the controller, and loading and unloading of the RC load are further realized. When the normally open contact of the first contactor is closed, the normally open contact of the fourth relay is closed, so that a high-level signal is input into the signal input port of the controller, when the high-level signal is input into the signal input port, the controller locks output signals of the second signal input port and the third signal input port, and a user cannot perform closing or opening operation on the normally open contacts of the second contactor and the third contactor at the moment; when the normally open contact of first contactor breaks off, can make the normally open contact disconnection of fourth relay, and then make the signal input part of controller input low level signal, do not lock the output signal of second signal input part and third signal input part this moment, the user can carry out the closure or the disconnection operation to the normally open contact of second contactor and third contactor this moment. So can realize loading the RC load, can only close the normally open contact of gear contactor (be second contactor and third contactor) earlier, the normally open contact of the UPS output contactor (be first contactor) of reclosing again, when uninstallation RC load, can only break off the normally open contact of UPS output contactor (be first contactor) earlier, the normally open contact of the gear contactor (be second contactor and third contactor) of reopening, and then realize the protection to the contactor, reduce the failure rate of contactor.
Examples
The embodiment of the utility model provides a control circuit for high-power RC load, as shown in fig. 1 to fig. 3, the RC load includes a resistance R1 and a electric capacity C1, resistance R1 and electric capacity C1 are parallelly connected, and this circuit includes: first contactor KM1, second contactor KM2, third contactor KM3, first relay KA01, second relay KA02, third relay KA03, fourth relay KA04 and controller PLC, controller PLC includes signal input port IO, first signal output port Q0, second signal output port Q1 and third signal output port Q2, and in fig. 3, 1M and 2M are the common ground port of controller, and 2L + is power input port.
The first signal output port Q0 is grounded through a coil KA01A of the first relay and a coil KA04A of the fourth relay in sequence, the second signal output port Q1 is grounded through a coil KA02A of the second relay, the third signal output port Q2 is grounded through a coil KA03A of the corresponding third relay, the signal input port IO is connected with a voltage input end through a normally open contact KA04B of the fourth relay, the voltage input by the voltage input end is 24V, one end of a coil KM1A of the first contactor is connected with a live wire L of a commercial power through the normally open contact KA01B of the first relay, the other end of a coil KM1A of the first contactor is connected with the live wire N, one end of a coil KM2B of the second contactor is connected with the live wire L through the normally open contact KA02B of the second relay, the other end of a coil KM2A of the second contactor is connected with the live wire N, one end of a coil KM3A of the third contactor is connected with the live wire 03B L of the live wire relay through the normally open contact 03 of the third relay, the other end of the coil KM3A of the third contactor is connected with a commercial power zero line N, one end of the resistor R1 is connected with a commercial power live line L through a normally open contact KM2B of the second contactor and a normally open contact KM1B of the first contactor in sequence, the other end of the resistor R1 is connected with the commercial power zero line N, and the capacitor C1 is connected with a normally open contact KM3B of the corresponding third contactor in series.
In this embodiment, the controller PLC model is CPUST30, the first relay KA01, the second relay KA02 and the third relay KA03 model are MYSN-GS, the first contactor KM1 model is NXC-18, and the second contactor KM2 and the third contactor KM3 model are NXC-9.
The circuit principle is as follows:
when the first signal output port Q0 of the controller PLC outputs a high level signal, the coil KA01A of the first relay and the coil KA04A of the fourth relay are energized, so that the normally open contact KA01B of the first relay and the normally open contact KA04B of the fourth relay are closed, after the normally open contact KA01B of the first relay is closed, the coil KM1A of the first contactor is energized, so that the normally open contact KM1B of the first contactor is closed, when the first signal output port Q0 of the controller PLC outputs a low level signal, the coil KA01A of the first relay and the coil KA04A of the fourth relay are powered down, so that the normally open contact KA01B of the first relay and the normally open contact KA04B of the fourth relay are disconnected, after the normally open contact KA01B of the first relay is disconnected, so that the coil KA01A of the first contactor is powered down, and further the normally open contact KM1B of the first normally open contactor.
When controller PLC's second signal output port Q1 output high level signal, the coil KA02A circular telegram of second relay, make the normally open contact KA02B of second relay closed, the normally open contact KA02B of second relay is closed back, make the coil KM2A circular telegram of second contactor, and then make the normally open contact KM2B of second contactor closed, when controller PLC's second signal output port Q1 outputs low level signal, the coil KA02A of second relay falls down, make the normally open contact KA02B disconnection of second relay, the normally open contact KA02B disconnection back of second relay, make the coil KA02A of second contactor fall down, and then make the normally open contact KM2B disconnection of second contactor.
When third signal output port Q2 of controller PLC exported high level signal, the coil KA03A circular telegram of third relay, make the normally open contact KA03B of third relay closed, the normally open contact KA03B of third relay is closed back, make the coil KM3A circular telegram of third contactor, and then make the normally open contact KM3B of third contactor closed, when third signal output port Q2 of controller PLC exported low level signal, the coil KA03A of third relay cuts down, make the normally open contact KA03B disconnection of third relay, the normally open contact KA03B disconnection back of third relay, make the coil KM3A of third contactor cut down, and then make the normally open contact KM3B disconnection of third contactor.
In practical application, a user can output high and low levels through the first signal output port Q0, the second signal output port Q1 and the third signal output port Q2 of the controller to realize the closing and opening of the normally open contacts of the first contactor KM1, the second contactor KM2 and the third contactor KM3, and further realize the loading and unloading of the RC load.
When the normally open contact KM1 of the first contactor is closed, the normally open contact KA04A of the fourth relay is closed, so that a high-level signal is input into a signal input port IO of the controller PLC, when the high-level signal is input into the signal input port IO of the controller PLC, output signals of the second signal input port Q1 and the third signal input port Q2 are locked, and a user cannot close or open the normally open contact KM2B of the second contactor and the normally open contact KM3B of the third contactor at the moment; when the normally open contact KM1 of first contactor disconnected, can make the normally open contact KA04A disconnection of fourth relay, and then make controller PLC's signal input part IO input low level signal, controller PLC does not lock second signal input part Q1 and third signal input part Q2's output signal this moment, and the user can carry out the operation of closing or opening to the normally open contact KM2B of second contactor and the normally open contact KM3B of third contactor this moment. So can realize at loading RC load, the normally open contact of the gear contactor (namely second contactor KM2 and third contactor KM3) can only be closed earlier, the normally open contact of the UPS output contactor (namely first contactor KM1) of reclosing, when uninstalling RC load, the normally open contact of the UPS output contactor (namely first contactor KM1) can only be disconnected earlier, the normally open contact of the gear contactor (namely second contactor KM2 and third contactor KM3) of reopening, and then realize the protection to the contactor, reduce the failure rate of contactor.
It should be noted that, related computer programs for locking the output signal of the signal output port by the controller PLC belong to the prior art, which do not belong to the key point of this embodiment and are not described herein again.
In order to facilitate reminding the user, the embodiment further includes: and the prompting module is connected with a fourth signal output port of the controller, wherein the prompting module can be a sound prompting module and/or a light prompting module, such as a loudspeaker, an indicator light, a display and the like.
After the corresponding software method is applied, when the normally open contact KM1 of the first contactor is closed, if a user sends an instruction of opening or closing the second contactor KM2 or the third contactor KM3 to the controller PLC, the user is prompted through the prompting module to inform the user that the normally open contact KM1 of the first contactor needs to be opened first.
It should be noted that the present invention provides only a specific structure of a control circuit for a high-power RC load, wherein the related modules are hardware system modules or functional modules combining a computer software program or protocol with hardware in the prior art, and the computer software program or protocol related to the functional modules is known to those skilled in the art, and is not an improvement of the present system, and is not described herein again; the improvement of the system is the interaction relation or the connection relation among all the modules, namely the integral structure of the system is improved, so as to solve the corresponding technical problems to be solved by the system.
Claims (5)
1. Control circuit for a high power RC load, said RC load comprising a resistor and at least one capacitor, said resistor and at least one capacitor being connected in parallel, characterized in that the circuit comprises: the controller comprises a signal input port, a first signal output port, a second signal output port and a third signal output port, the number of the third contactor, the third relay and the third signal output port is the same as that of capacitors, and the third contactor, the third relay and the third signal output port are in one-to-one correspondence with the capacitors;
the first signal output port is grounded through a coil of the first relay and a coil of the fourth relay in sequence, the second signal output port is grounded through a coil of the second relay, the third signal output port is grounded through a corresponding coil of the third relay, the signal input port is connected with the voltage input end through a normally open contact of the fourth relay, one end of the coil of the first contactor is connected with a commercial power live wire through the normally open contact of the first relay, the other end of the coil of the first contactor is connected with the commercial power zero line, one end of the coil of the second contactor is connected with the commercial power live wire through the normally open contact of the second relay, the other end of the coil of the second contactor is connected with the commercial power zero line, one end of the coil of the third contactor is connected with the commercial power live wire through the normally open contact of the corresponding third relay, and the other end of the coil of the third contactor is connected with the commercial power zero line, one end of the resistor is connected with a live wire of the commercial power sequentially through a normally open contact of the second contactor and a normally open contact of the first contactor, the other end of the resistor is connected with a zero line of the commercial power, and the capacitor is connected with a normally open contact of the corresponding third contactor in series.
2. The control circuit for a high power RC load according to claim 1, further comprising: and the prompting module is connected with a fourth signal output port of the controller.
3. The control circuit for a high power RC load according to claim 1, wherein said controller is of the type CPUST 30.
4. The control circuit for a high power RC load according to claim 1, wherein said first, second and third relays are of the type MYSN-GS.
5. The control circuit for a high power RC load according to claim 1, wherein said first contactor is of the type NXC-18 and said second and third contactors are of the type NXC-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220739035.7U CN217332570U (en) | 2022-03-31 | 2022-03-31 | Control circuit for high-power RC load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220739035.7U CN217332570U (en) | 2022-03-31 | 2022-03-31 | Control circuit for high-power RC load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217332570U true CN217332570U (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220739035.7U Active CN217332570U (en) | 2022-03-31 | 2022-03-31 | Control circuit for high-power RC load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217332570U (en) |
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2022
- 2022-03-31 CN CN202220739035.7U patent/CN217332570U/en active Active
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