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2.11
USER INTERFACE
LED Targets
There are 6 LED Targets in the faceplate of the MIF. The first one is green and has the 'READY' (relay in service)
fixed meaning (cannot be configured); the second one is red and fixed for trip, while the other 4 are red and can be
configured by the user in OPTION1 and OPTION2 models. The default configuration of the LEDs is shown in figure
2.2
The meaning of each LED is as follows:
•
READY: The relay is powered up, its power supply is receiving Vdc or Vac, and all the internal circuits are
working properly. The relay status setting is set as "RDY" (ready) and at least one of the protection functions is
enabled. This LED not being lit in the previous mentioned conditions indicates lack of auxiliary supply voltage or
an internal HW/SW critical failure condition.
•
TRIP: The relay has issued a trip, activating the corresponding tripping output contact.
•
PHASE: Points out that the trip has been issued by one of the Phase Overcurrent Units.
•
GROUND: Points out that the trip has been issued by one of the Ground Overcurrent Units.
•
INST: Points out that the trip has been issued by one of the Instantaneous Units, either phase or ground units.
•
PICKUP: Points out that at least one of the protective units has picked up.
LEDs associated to tripping functions are latched and once they have been lit up, they remain lit up until the ENTER
key is pressed for more than 3 seconds (RESET) provided that the trip condition has disappeared. The LED
associated to function pickup is auto-reset type, and lights up while the pickup condition (current above setting)
exists.
Keypad and Display
A three-key keypad allows access to the MIF relay information and allows settings change. Measurement data (actual
values), last trip information (fault report) and settings are shown on the 3.5 characters dots-display. Only by using a
PC, the ENERVISTA MII SETUP program and a communications cable the user can access to all the internal
information in the relay, as the list of events and oscillography data cannot be shown on the small faceplate display.
Access to I/O configuration and logical configuration is also possible only via PC.
GEK-106273L
PRODUCT DESCRIPTION
Ready
Trip
Phase
Ground
Inst.
Pickup
Figure 2.2 MIF LEDs DEFAULT CONFIGURATION
MIF Digital Feeder Protection
2-13
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