ABB REX 521 Technical Reference Manual, Standard Configurations page 110

REX 521 Protection Relay 1MRS 751802-MUM
Technical Reference Manual, Standard Configurations
As the HSPO1 is always named as the "Trip 1" output signal, the settings are made
directly in Main menu\Configuration\Output SWGRP\Trip 1 where
the checksum for the settings is displayed (255 by default).
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To change the settings for the Trip 1, go to Configuration\Output
SWGRP\Trip 1 and press the [E]-button. The different protection functions are
→ ←
displayed one at a time. By pressing the [ ] or [ ] navigation push button, it is
↑ ↓
possible to scroll between the different protections. By pressing the [ ] or [ ]
navigation push button, the specific protection function trip signal can be connected
or disconnected. When the two-stage overcurrent (3I> and 3I>>>), two-stage earth-
fault (Io> and Io>>), the unbalance and thermal overload protection are selected, the
checksum for the Trip 1 is 221.
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To change the settings for the Trip 1, go to the "Configuration" and "Output
SWGRP" and select the "New value" on Trip 1. Press backspace to change the
value. In the "New value" window the protection functions that are used can be
marked or unmarked. The checksum can also be changed directly. Finally, the new
setting has to be sent to the relay with the "Download" button.
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110