Manual MRI3 GB
Woodward
DOK-TD-MRI3 Rev.A
17
Figure 3.15: Front plate MRI3-IRSR; MRI3-IRE/IRX, MRI3-IRYR and MRI3-ISR
3.3 LEDs
The LEDs left from the display are partially bi-colored, the green indicating measuring, and the red
fault indication.
MRI3 with directional feature have a LED (green- and red arrow) for the directional display. At
pickup/trip and parameter setting the green LED lights up to indicate the forward direction, the red
LED indicates the backward direction.
The LED marked with letters RS lights up during setting of the slave address of the device for serial
data communication.
The LEDs arranged at the characteristic points on the setting curves support the comfortable set-
ting menu selection. In accordance with the display 5 LEDs for phase fault overcurrent relay and 5
LEDs for earth-fault relay indicate the corresponding menu point selected.
The LED labeled with the letters LR is alight while the fault recorder is being adjusted.