Lenze frequency inverters unstick glue production
A
Lenze product story
Edited by the Engineeringtalk editorial team
Aug 12, 2009
Westin Drives has used Lenze SMD inverters at Grosvenor Chemicals to prevent PVA emulsion-pump motors from burning out.
The inverters allowed the previously fixed pump-speed to be adjusted and built-in thermal monitoring of the motors has cut out downtime problems.
Grosvenor Chemicals, part of the Whyte Group, specialises in contract chemical manufacture and packing.
Its site in Huddersfield manufactures a range of chemicals and pharmaceutical intermediates.
The variation in PVA emulsion viscosity across different products was causing motor overloads, particularly on restarts.
Westin solved the problem with a Lenze SMD inverter supplied in a small and simple panel.
The inverter allows a soft start and can hold 150 per cent rated torque for up to 60 seconds.
Built-in motor monitoring allows a shutdown with error message if the motor begins to overheat, without causing any motor change.
The supplied inverters are rated at 5.5 and 7.5kW and fitted 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.
In this case it was able to take advantage of the compact dimensions of the SMD inverter, for example a footprint of only 114 x 171mm at 5.5kW.
This results in a compact panel and reduced costs.
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