A high-pressure descaling pump system supplied by CISDI-Electric is reducing maintenance costs at Shandong Shengyang’s 1,700mm hot strip mill.

The upgraded descaling system rises from 15Hz to 50Hz in just eight seconds and can reverse in 20 seconds. Enhanced automation levels have cut maintenance costs dramatically.

Shengyang’s outdated descaling system had five 710KW water pumps which worked in parallel and adjusted the outlet pressure by changing the quantity of pumps.

Problems included intermittent pressure control, pumps wearing badly and high maintenance costs.

CISDI rebuilt the descaling system by replacing the original five pumps with one 4,500KW water pump. A powerful MVC1200-10k/350 high-voltage frequency converter enables the pump‘s rotation speed to be controlled smoothly, which will extend its service life.

The converter, with a load motor of 10kV/4500kW and a nominal capacity of 5,650KVA, is the most powerful ever to be supplied by CISDI Electric to a water descaling system.

The high-voltage frequency converter at the descaling pump

A profile of CISDI’s MVC1200-series HV frequency converter

Technical characteristics of the MVC1200-series HV frequency converters:

-       Highly-integrated digital control system (PECS controller)

-       Modular design

-       Stacked bus expertise

-       Strong diagnosis on faults

-       Ergonomics-focused HMI

-       Small outline dimensions, easy maintenance

-       Tailored design

-       Small harmonic yet high power factor

-       Good output characteristics

-       Internet + field bus

-       Superior energy efficiency