1MRS 751107-MUM
Protection Relay
Operator’s Manual
REX 521
11
3.1.1. Push-button functions
The HMI includes push-buttons for operating the protection relay.
A quick touch on the arrow button up [
↑] or down [↓] is interpreted as one step
upwards or downwards in a menu or as the minimum step up or down in setting
mode of a parameter.
• The cursor stops at the first and last rows in a menu; pressing the [
↑] button at the
first row or [
↓] button in the last row is ignored.
• If the [
↑] or [↓] button is kept pressed, the menus are automatically scrolled faster
than with single button pressings.
Fig. 3.1.1.-1 Push-buttons
The table below gives a short explanation of the push-buttons and their functions.
Table 3.1.1-1 Push-button functions
Up/Down These buttons are used for:
• moving up and down in menus
• scrolling active digits of a parameter when entering
a new setting value
Left /Right These buttons are used for:
• moving left and right in menus
• changing the active digit of a parameter when
entering a new setting value
Clear/Cancel This button is used for:
• leaving the setting mode without saving the values
• returning to the main view from submenus
• clearing indication messages
• clearing events when the event view is selected
(press 2 s)
• clearing alarm LEDs when the main view is
selected (press 2 s)
• resetting latched output relays (press 5 s)
Enter This button is used:
• for entering the setting mode of a parameter
• for confirming a new value of a setting parameter
• in combination with the
[↑] or [↓] button for
adjusting the display contrast
Nav_Butt
C
E
Navigation push buttons
right
down
clear/cancel
Clear and Enter buttons
enter
up
left
C
E
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