Manual 37138C
ESDR 4T - Current Differential Protection Relay
© Woodward
Page 21/46
LEDs
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1
I
S
Color: green
Restraint current I
s
The actual values of the restraint current I
s
are visible in the display
2
I
d
Color: green
Differential current I
d
The actual values of the differential current I
d
are visible in the display.
3
Monitoring ON
Color: green
Monitoring
ON
............... Monitoring is active.
OFF
............. Monitoring is deactivated through entry "Monitoring Off",
through activation of discrete input terminal 19 "Blocking" or
through wrong configuration of "CT-ratio" or "Generator cur-
rent".
4
Alarm
Color: red
Alarm
The threshold for differential current monitoring in level 2 is or was ex-
ceeded. This message remains displayed until it is reset.
Buttons
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The display can appear in two different modes: display mode or configuration mode. Pressing the "Dis-
play/Digit
↑
" and "Clear/Cursor
→
" buttons simultaneously changes the control unit from one mode to the other.
If the digital input terminal 17 "Configuration off" is energized, the display changes into Display mode and can-
not be changed to configuration mode. If this digital input will be de-energized again, the display changes back
to configuration mode.
In order to facilitate the setting of the parameters, the buttons have an AUTOSCROLL function. It allows the
user to advance to the next configuration screen, digit, or cursor position more rapidly. The AUTOSCROLL
function will only be enabled once the user depresses and holds the corresponding key.
12
Message
↓
/ Select
Message
↓
/ Select
Display mode:
Message
↓
- Pressing this button advances the display
through the operating and alarm messages. The alarm mes-
sages are displayed in the order in which they were generated.
Configuration mode:
Select – By pressing this button the user advances to
the next parameter. If any changes are made to the configured
value by pressing either the "Digit
↑
" or "Cursor
→
" buttons,
the new value must be saved to the controller by pressing the
"Select" button once. If this button is pressed again, the dis-
play will advance to the next parameter.
