A vacuum pressure transmitter is installed on the vacuum negative pressure pipeline, and the vacuum pressure signal is sent into an electric signal and sent to the air pressure central control PLC, and the vacuum pressure is displayed on the monitoring microcomputer of the central control room, which is convenient for the operator to negative pressure Monitor the pipeline pressure to understand the operation of the vacuum machine. The cooling system of the control cabinet is combined with the internal space of the VS20 vacuum machine and the position of the control cabinet. A vent hole is opened in the upper left corner of the control cabinet of the vacuum machine, and the axial flow fan is installed on the vent hole, the axial flow fan Start and stop with the vacuum machine; also open the air intake hole under the control cabinet, so that the air inside the control cabinet flows, reduce the temperature inside the control cabinet, and facilitate the heat dissipation of components.
Control circuit improvement The host control circuit before improvement: When starting, press the start button, the MX contact of the control board is closed, the soft starter controls the start and run of the host; when stopped, press the stop button to control the board The MX contact is disconnected and the soft starter controls the host to stop. The improved host control circuit diagram before the improvement of the host control circuit: the improved host part of the circuit and other control circuits are unchanged.
Improved working principle of the host electrical control circuit: During operation, after closing the power switch, press the start button to control the upper contact MX to close, the intermediate relay A4 is energized, and its normally closed contact is closed; the soft starter begins to control The host starts normally. When the soft starter is started, its running contacts 13 and 14 are closed. Relay A2 is energized, self-locking, its normally closed contact is disconnected, A4 relay is de-energized, soft starter No. 1 terminal When the power is lost, the soft starter is out of operation; at the same time, the normally open contact of A2 is closed, the KM coil is energized, and the installed contactor is put into operation; the main engine is running normally. When stopped, press the stop button, the contact MX on the control circuit board is disconnected, the host control power is cut off, and the host stops running. The local/remote switch realizes the conversion of local/remote operation. When disconnected, the local button operates the vacuum machine to start and stop; when closed, the microcomputer controls the vacuum machine to start and stop.
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