ABB Relion 670 series, Technical Reference Manual

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Each indication LED on the local HMI can be set individually to operate in six
different sequences
• Two sequences operate as follow type.
• Four sequences operate as latch type.
•
Two of the latching sequence types are intended to be used as a protection
indication system, either in collecting or restarting mode, with reset
functionality.
• Two of the latching sequence types are intended to be used as signaling
system in collecting (coll) mode with an acknowledgment functionality.
The light from the LEDs can be steady (-S) or flashing (-F). See the technical reference
manual for more information.
3.5.4.2 Design
The information on the LEDs is stored at loss of the auxiliary power to the IED in
some of the modes of LEDGEN. The latest LED picture appears immediately after the
IED is successfully restarted.
Operating modes
• Collecting mode
•
LEDs which are used in collecting mode of operation are accumulated
continuously until the unit is acknowledged manually. This mode is suitable
when the LEDs are used as a simplified alarm system.
• Re-starting mode
•
In the re-starting mode of operation each new pickup resets all previous
active LEDs and activates only those which appear during one disturbance.
Only LEDs defined for re-starting mode with the latched sequence type 6
(LatchedReset-S) will initiate a reset and a restart at a new disturbance. A
disturbance is defined to end a settable time after the reset of the activated
input signals or when the maximum time limit has elapsed.
Acknowledgment/reset
• From local HMI
•
Active indications can be acknowledged or reset manually. Manual
acknowledgment and manual reset have the same meaning and is a common
signal for all the operating sequences and LEDs. The function is positive
edge triggered, not level triggered. The acknowledged or reset is performed
1MRK505222-UUS C
Section 3
Local HMI
63
Technical reference manual