Feasibility and advantages of applying HV VFD

Feasibility and advantages of applying HV VFD 

On the fan or water pump with constant torque, the feasibility of reforming the HV frequency converter is as follows:

In the original system, except that the primary fan is driven by frequency conversion, other loads are straight-up, which has a great impact on the power grid and the motor when starting up, and the long-term power frequency operation has a great wear on the mechanical parts, which increases the maintenance cost, and the energy waste caused by throttle adjustment is serious. Moreover, the failure rate is relatively high with so many straight-up starting devices. We can reform the system to driven by HV frequency converter. Only a HV frequency converter is connected in series between the switch cabinet and the motor, and the control logic is connected in series to the background of DCS, and then the load can be adjusted in real time to meet the on-site process requirements; Also replace the original aging equipment with a high-performance HV VFD (such as Schorch HV frequency converter).

The HV VFD with " multilevel structure with unit connected in series" is widely used in various industries, and the technical scheme is mature and reliable.

The HV VFD is suitable for the working condition of user power grid, the VFD can run normally with +10% ~-10% fluctuation of the main power supply, and the working condition before power loss can be automatically restored within 3 seconds after instantaneous power loss;

The input power factor is high, no power factor compensation device is need on the network side; The harmonic current is less to meet the requirements of international and national standards, without harmonic pollution to the power grid; Output ladder sine PWM waveform, without output filter device, can be connected to ordinary motor.

No damage to cable and motor insulation, less harmonic of motor, and less mechanical vibration of bearings and blades; Modular design of power circuit, simple maintenance; The dry-type phase-shifting transformer is built in the cabinet, which is convenient to install and maintenance-free.

The main circuit and the controller are connected by optical fiber, which is safe and reliable;

Complete fault monitoring circuit and accurate fault alarm protection;

Flexible control logic structure to adapt to the changeable field control needs; Flexible choice of on-site control, remote control of duty room, telemetering and monitoring through telephone network; Can receive and output 4 ~ 20mA industrial standard signals;

Built-in PID regulator directly, which can operate in open loop or closed loop.

Can carry out operation data and operation records, print and output operation reports; Complete general inverter parameter setting function; Equipment installation, debugging and parameter setting are convenient and quick.

Multi-language operation interface, featuring no noise, no moving parts, large-capacity data storage and long service life, is suitable for the level of general duty personnel.