In order to prevent the interference between the power […]
In order to prevent the interference between the power grid and the frequency converter, the input side of the inverter is best connected with 1 reactors. The main wiring between the control cabinet and the compressor does not exceed the 30m main line and the control line to separate the line and keep a certain distance. The wiring of the control loop is shielded twisted pair line, and the distance of the air compressor should be within 20rn. In addition to the control cabinet is provided with a ventilation fan, inverter grounding terminal to reliable grounding, grounding and power mix.
Debugging: after completing the function setting of the frequency converter and running the empty load, the blot air compressor accessories can be debugged by the system linkage.
The main methods of debugging:
1 the inverter access system;
2 the operation of power frequency control is carried out.
3 the frequency conversion control operation, including open loop and closed loop control of local debugging.
Ring opening: at this time, we mainly observe the situation of the frequency rising of the frequency converter, whether the running sound of the device is normal, whether the pressure of the air compressor rises steadily, whether the pressure transmitter displays normally, and whether the equipment is shut down is normal or not. If everything is normal, the closed loop debugging can be carried out. The closed loop: mainly adjusts the frequency rise and fall speed of the frequency converter, and matches the rise and fall of the air compressor pressure. No pressure oscillation occurs, and observe the mechanical resonance point and jump the frequency near the resonance point. Then the parameters of PID are set and the air compressor system is used to reduce the impact on the frequency converter.