1. The actual application case of the Knapsack frequency converter in air     compressor 

Client ：Kuangzhou××Machinery Co., Ltd.

Model of the frequency converter：NZS0075T4B ( 7.5 kW, 380V)

The control system takes output pressure as control object. The closed loop constant pressure control system consists of inverter, pressure sensor and motor. The pressure value can be set directly by the operating panel. The field pressure is detected by a sensor, converted to 4 ~ 20mA current signal and then feed back to inverter. The inverter performs PID calculation to adjusting its output frequency for the purpose of constant pressure control and energy-saving of air compressor. 

 

Basic function code setting:
 

P101=2，P104=0,P106=25，P107=12，P108=12，P212=2940，P300=1，P301=5，P317=29，P320=30，P325=30，P600=1，P604=5，P605=10，P606=3，P611=40，P612=30，P613=80，P619=1,P621=2,P629=16,P000=7
 

Our products have the following characteristics: Waterproof, dustproof, PID inset, constant pressure water supply, very suitable used in the working conditions of the air compressor, by the change of the converter software, we can remove the converter Controller and save the cost.

Application examples as shown in figure: