Costly downtime reduced on PVA emulsion pumps
Lenze’s smd inverters have solved a problem of costly downtime, as a result of motors burning out on PVA emulsion pumps at Grosvenor Chemicals, which manufactures a diverse range of chemicals and pharmaceutical intermediates at its UK plant.
The PVA emulsion pumps are used in the production of glue at Grosvenor’s Huddersfield factory. Previously they were driven by fixed speed electric motors, which had problems resulting from the variation in PVA emulsion viscosity across different products. This was causing motor overloads, particularly on restarts, with the consequent problems of premature motor failures, and costly downtime.
The solution to this problem was Lenze smd inverters. These were supplied in very compact panels – an arrangement possible due to the very small footprint of the smd series (only 114mm x 171mm for 5.5kW). The inverters are rated at 5.5kW and 7.5kW; and are equipped with a footprint filter to meet RFI class ‘A’ requirements. A separate keypad is door mounted to give the operators an easy way to change the pump speed.
The smd units provide a soft start facility for the pump motors, and can hold 150% rated torque for up to 60- seconds. They also provide further protection via their built-in thermal motor monitoring, which allows a shutdown with error message if the motor begins to overheat, without causing any motor change.
This successful solution, based upon smd inverters, was supplied to Grosvenor Chemicals by local company Westin Drives - a StockDrive partner for Lenze frequency inverters. Westin are experts at providing discrete or integrated solutions across motors, geared motors and inverters, and of providing high levels of technical assistance and customer support.
About the SMD Inverter
Lenze’s ‘smd’ range of ac drives brings inverter drive functionality and efficiency to a wider range of simple motor control applications. The smd drives provide a perfect solution by breaking through the existing price barrier for ac drives while retaining high functionality and offering easy to use features. Power ratings for the drives are from 0.25kW to 22kW, and include a range of international voltage options to support export sales. The smd series also features the innovative EPM memory chip that can cut programming and service time by 90% for OEM manufacturers and systems integrators.
About Lenze - AC Tech International
Lenze - AC Tech is part of the Lenze Group providing Sales and Technical support for the smd / smv AC Inverter Drive products, and PositionServo drive and motor products - to Lenze offices and distributors around the world outside of the Americas and Germany.
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