Passwords; Display Backlight; Display Contrast - ABB REX 521 Operator's Manual

1MRS 751107-MUM
3.1.3.
3.1.4.
3.1.5.
Protection Relay
Operator's Manual

Passwords

ABB
Protection
Control
Cond. monit.
Measurements
Power Quality
Configuration
Analog scales
Tests
Communication
Digital Inputs
Display
Configuration
Fig. 3.1.3.-1 Password menus
Setting values are protected by passwords. There are two different passwords, one
for protecting the HMI setting values and another for protecting settings through
serial communication.
• The default value of the serial communication password is 001 and of the HMI
password 999.
• The HMI password is not active until it has been changed from the default value.
After changing it, the relay prompts for password whenever the [E] button is
pressed in the setting value menu. Once the right password has been given, it
stays active until the display is returned to idle state by time-out. To disable the
HMI password, change it back to the default value 999.
• In case a password is forgotten, the HMI password can be viewed and changed
via serial communication.

Display backlight

The backlight of the display is normally off. When a button on the HMI is pressed,
the backlight turns on automatically and the panel is ready for further operations.
• At power up, the backlight is also turned on during the display test.
• After a time-out period (5 min), the backlight is automatically switched off if
there has not been any activity on the panel.
• When changing between Local/Remote mode by a digital input, the backlight is
turned on for 10 seconds.

Display contrast

The display contrast is temperature compensated, which means that the contrast
automatically adjusts itself with temperature to preserve readability.
• To obtain optimal readability, the contrast of the display can be adjusted.
Pressing simultaneously the [E] button and [
decreases the contrast.
Communication Comm. settings
Comm. settings DNP 3.0
Rear port
IEC 103
LON
MODBUS
SPA FRONT
SPA REAR
Password MMI
= 999
↑ ↓
] or [ ] button increases or
REX 521
SPA address
= 001
Baud rate
= 9600 bps
Slave status
=1
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