ABB REX 521 - Instructions for REX 521 Operation; HMI Features Overview

1MRS 751107-MUM
Protection Relay
Operator’s Manual
REX 521
9
3. Instructions
3.1. HMI features
• Push-buttons for navigating, [C] Clear/Cancel and [E] Enter
• Language selection
• Setting values are protected by passwords
• Display backlight
• Display contrast
• Display test
• Selection of primary values
• Optically isolated serial communication port
• Three LED indicators
• Eight programmable alarm LEDs