01 Introduction:

Water resources are an important factor for economic development and sustainable social development, and urban sewage treatment rate has become an important symbol of whether a region is civilized or not. The serious pollution and increasing scarcity of water resources has now become a topic of concern all over the world. With the development of economy in China, the amount of urban sewage and industrial wastewater has increased sharply, providing a huge market space for the water treatment industry. RVE32 inverter has a wide range of applications in sewage treatment, and has achieved good economic and social benefits.

02 Features:

RVE32 is a wall-mounted inverter, the power range is 0.75KW-500KW, the voltage level of the incoming line voltage is 380V-480V, and the control method is vector control without speed sensor.

RVE32 has a wealth of substations, including 8 digital inputs (LI1-LI8), 2 analog inputs (AI), 2 relay outputs (TA), 2 analog outputs (AO), 5V auxiliary power supply for analog power supply Fixed input, 24V auxiliary power supply is used for digital input, all LI/TA, AI/AO can be freely programmed to define functions.

MODBUS interface is standard configuration of RVE32, no option is required. The RVE32 can be connected to higher-level automation systems via MODBUS.

03 Advantage:

· Large starting torque, 1.5 times the torque output at open-loop 0.5Hz, meeting the requirements of aeration blower operation;

· It has the advantage of fast torque response, and when the load fluctuates, the current fluctuation is small; It has good overload capacity and environmental adaptability, and has high operational reliability;

· Super power grid adaptability, anti-power grid fluctuation ability up to ±15%, to ensure the stability of output voltage, current, speed   Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity; It has strong environmental adaptability, and the completely independent air duct design can greatly improve the resistance to harsh environments such as oil pollution, dust and damp heat.

04 System Introduction:

In this system, the main motor of the 110KW sewage treatment aeration blower is driven by the RVE32 110KW frequency converter, and the closed-loop automatic control is realized according to the feedback signal of the dissolved oxygen sensor.

05 Technical Parameter:

06 On Site Usage:

According to the on-site space situation, a RVE32 series inverter is installed in the control cabinet, and the inverter installation and on-site motor are as shown in the figure.

07 Running Result:

The sewage treatment aeration blower control system using RVE32 inverter has been put into operation for more than three years, and has achieved good economic and social benefits:

The control device operates reliably, has good environmental adaptability, can resist harsh environments such as oil pollution, dust and damp heat, and has a low failure rate;

Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity;

The economic benefits are remarkable, the power saving effect is more than 20%, and the entire investment increased by the frequency conversion control system can be recovered in more than one year.

08 Customer Benefits:

*PID automatic control, reduce the workload of workers and improve work efficiency; *Reduced motor loss and maintenance costs;

*Comprehensive protection function of the inverter to ensure the continuity of production to the greatest extent;

*The economic benefits are remarkable, and the entire investment increased by the frequency conversion control system can be recovered in more than one year.