1. The 1K16 comes from the instrument control interlock contact, allowing the motor to start when the contact is closed.2. The 1K15 comes from the instrument control interlock contact, when the process fails, the normally closed contact disconnects and stops the motor.3. The 1ZK1 time relay is used to control the input time of the frequency-sensitive resistor. The time setting value should be considered according to the actual situation at the factory, and it is tentatively set to 7S when leaving the factory.4. The components in the dashed frame are the components installed on the operating table of the oxygen compressor.