Inverse Time Limitation; Cold Load And Inrush Current Handling; Setting Groups - Allen-Bradley Rockwell Automation 857 User Manual

Inverse Time Limitation

The maximum measured secondary current is 50xI
scope of inverse curves with high pick-up settings. See "Inverse Time
Operation" for more information.

Cold Load and Inrush Current Handling

See "Cold Load Pick-up and Inrush Current Detection".

Setting Groups

There are two settings groups available for each stage. Switching
between setting groups can be controlled by digital inputs, virtual
inputs (mimic display, communication, logic) and manually.
Figure 3.5 – Block diagram of the three-phase overcurrent stage I> and I'>
Figure 3.6 – Block diagram of the three-phase overcurrent stage I>> and I>>>
3-7
Protection Functions
. This limits the
N
857-UM001A-EN-P – July 2009