October 2008Operator Interfaces, Switches & Relays
The Newelec OLR84S protection relay’s success can be attributed to the separation of the start-up acceleration and running load currents.
OLR84S provides load shear pin protection for geared motor drives such as bucket conveyors, scrapper winches, compressors, chain conveyors and screw conveyors. The start-up acceleration time is adjustable from 5 to 50 s while the running load will trip in 100 milliseconds. This allows the running load to be adjusted between 30% and 100% of the selected CT ratio allowing users to select running overload levels to suit the application.
For example a 45 kW 380 V 4-pole motor rated at 90 A running a chain conveyor drive with a current transformer selected at 100:1 and a motor acceleration time of 3 s at 450 A. Once the drive is running the load current varies between 35 and 65 A; setting the maximum load to 80% (80 A) allows for all normal operational load current variations. The moment the load current exceeds 80 A, the OLR84S trips the drive in less than 100 milliseconds saving the drive shear pin and eliminating mechanical damage to the chain conveyor drive assembly.
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