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1MRS750500-MUM
6.5.
6.5.1.
Feeder, Machine and Transformer Terminals
Operator's Manual
LED indicators
The HMI includes three protection LED indicators. The basic functionality of the
LED indicators is described below. In addition, there are function block -specific
LED indicator operations that are described in more detail in the function block
manuals (refer to the CD-ROM Technical Descriptions of Functions, 1MRS750889-
MCD).
LED indicators can be latching or non-latching:
• Non-latching type of LED indicator goes automatically out when the fault
disappears (the protection stage resets)
• Latching type of LED indicator remains lit, although the fault disappears, until
cleared by pressing [C] for two seconds
Green LED indicator
Three different functions are embedded in the Ready LED indicator.
Table 6.5.1-1
Green LED indicator functions
Steady LED: READY
Flashing LED: IRF
Non-active LED: OFF
Normal operation
• No internal faults
• Auxiliary voltage is available
An internal relay fault (IRF) has occurred but the
auxiliary voltage is connected
• When an internal fault occurs, a message is
received in the assisting window, provided the
HMI/MIMIC panel is operative
• The IRF LED indicator is latching
OR
The terminal is in test mode
The auxiliary voltage supply to the terminal has
been disconnected.
Check that the auxiliary voltage is
!
disconnected before taking any further
action
RE_ 54_
33
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