A centrifugal water-cooled chiller controller

Abstract

The utility model discloses a centrifugal water -cooled water chiller controller, include: a plurality of control panel, control panel include: MCU, it can transmit first communication signal on first Hlink bus and transmit second communication signal on second Hlink bus, first communication unit, first two stage isolation unit for isolating the power signal and communication signal of MCU and first communication unit, second communication unit, second two stage isolation unit for isolating the power signal and communication signal of MCU and second communication unit, main control panel is connected with each slave control panel communication through second Hlink bus, at least one expansion board, include: expansion MCU, expansion communication unit, third two stage isolation unit for isolating the power signal and communication signal of MCU and expansion communication unit, the utility model discloses can improve centrifugal water -cooled water chiller in the reliable communication of industrial complex scene.

Claims

1. A controller for a centrifugal water-cooled chiller unit, characterized in that, include: Multiple control boards, including a master control board and at least one slave control board, the control boards comprising: An MCU that can transmit a first communication signal on a first Hlink bus and a second communication signal on a second Hlink bus; The first dual-stage isolation unit includes a first power isolation unit and a first communication isolation unit; The first communication unit, the first power isolation unit is used to isolate the power supply of the control board and the power supply of the first communication unit, and the first communication isolation unit is used to isolate the communication signals of the MCU and the first communication unit on the first Hlink bus. The second dual-level isolation unit includes a second power isolation unit and a second communication isolation unit; The second communication unit, the second power isolation unit is used to isolate the power supply of the control board and the power supply of the second communication unit, and the second communication isolation unit is used to isolate the communication signals of the MCU and the second communication unit on the second Hlink bus. The main control board communicates with each slave control board via a second Hlink bus. At least one expansion board, which is communicatively connected to the main control board via a first Hlink bus, or to a slave control board via a first Hlink bus, or partially communicatively connected to the main control board and partially communicatively connected to the slave control board via a first Hlink bus, and the expansion board includes: Expand MCU; The third dual-level isolation unit includes a third power isolation unit and a third communication isolation unit; An extended communication unit is provided, wherein the third power isolation unit is used to isolate the power supply of the extended MCU and the power supply of the extended communication unit, and the third communication isolation unit is used to isolate the communication signals of the extended MCU and the extended communication unit on the first Hlink bus.

2. The centrifugal water-cooled chiller controller according to claim 1, characterized in that, The first power isolation unit, the second power isolation unit, and the third power isolation unit are all the same power isolation module; Each of the first communication isolation unit, the second communication isolation unit, and the third communication isolation unit includes a transmit isolation circuit, a receive isolation circuit, a clock isolation circuit, and a reset isolation circuit; The transmit isolation circuit, receive isolation circuit, clock isolation circuit, and reset isolation circuit are all isolated using optocouplers.

3. The centrifugal water-cooled chiller controller according to claim 1, characterized in that, The control panel also includes: An enable switching unit, which is connected to the MCU, is used to switch the output of a first enable signal and a second enable signal; A latch unit receives a first enable signal and a second enable signal, and has a first data channel and a second data channel. The first enable signal is used to control the connection / disconnection of the first data channel, and the second enable signal is used to control the connection / disconnection of the second data channel. The first RS485 circuit has the input terminals of the first set of data channels and the input terminals of the second set of data channels respectively connected to the communication signals isolated by the MCU via the first communication isolation unit. The output terminal of the first set of data channels is connected to the first RS485 circuit, and the output terminal of the second set of data channels is connected to the first communication unit. The first RS485 circuit transmits 485 communication signals to the 485 bus.

4. The centrifugal water-cooled chiller controller according to claim 3, characterized in that, The enable switching unit includes: A switch control unit, the control terminal of which is connected to the output terminal of the MCU; A relay has one end of its coil grounded and the other end connected to the output terminal of the switch control unit. The normally closed switch of the relay is connected in series between the power supply output by the first power isolation unit and the first enable signal. The normally open switch of the relay is connected in series between the power supply output by the first power isolation unit and the second enable signal. When the MCU outputs the first control signal at its output terminal, the coil is not energized, and the first enable signal enables a first set of data channels. When the MCU outputs the second control signal at its output terminal, the coil is energized, and the second enable signal enables a second set of data channels.

5. The centrifugal water-cooled chiller controller according to claim 4, characterized in that, The relay is a solid-state relay.

6. The centrifugal water-cooled chiller controller according to claim 4, characterized in that, The switch control unit includes: A switch control element, the control terminal of which is connected to the output terminal of the MCU, the first terminal of the switch control element is grounded, and the second terminal of the switch control element is connected to the other end of the coil.

7. The centrifugal water-cooled chiller controller according to claim 6, characterized in that, The switch control element is: The base of the NPN transistor is connected to the output terminal of the MCU, the emitter of the NPN transistor is grounded, and the collector of the NPN transistor is connected to the other end of the coil.

8. The centrifugal water-cooled chiller controller according to claim 1, characterized in that, The MCU adopts a main control chip, the first communication unit adopts an MM1192 communication chip and is used to receive signals that have been alternately reversed, and the power supply of the MM1192 communication chip is the power supply output after being isolated by the first power isolation unit. The centrifugal water-cooled chiller unit controller also includes: The demodulation circuit is used to convert the signal output by the MM1192 communication chip into a binary output signal corresponding to the signal that alternately reverses the signal. The power supply in the demodulation circuit is the power supply output after being isolated by the first power isolation unit, and the ground in the demodulation circuit is the ground isolated by the first power isolation unit. The modulation circuit is used to modulate the signal output from the signal transmitting end of the main control chip into the signal received by the MM1192 communication chip. The power supply in the modulation circuit is the power supply output through the first power isolation unit, and the ground in the modulation circuit is the ground isolated by the first power isolation unit.

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