Operation Principle - ABB RELION 630 Series Technical Manual

Section 3
Basic functions
3.2.3.3
38
Each indication LED on LHMI can be set individually to operate in six different
sequences; two as follow type and four 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. The other two are intended to be used as
signalling system in collecting mode with acknowledgment functionality.

Operation principle

Status LEDs
There are three status LEDs above the display in the front of the IED: green, yellow
and red.
The green LED has a fixed function, while the yellow and red LEDs are user
configured. The yellow LED can be used to indicate that a disturbance report is
created (steady) or that the IED is in test mode (flashing). The red LED can be used to
indicate a trip command.
Indication LEDs
Operating modes
Collecting mode
• LEDs which are used in the 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 start 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)
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 LHMI
• The active indications can be acknowledged/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. Acknowledge/reset via the
Clear button and menus on the LHMI.
• From function input
• The active indications can also be acknowledged/reset from an input,
ACK_RST, to the function. This input can, for example, be configured to a
binary input operated from an external push button. The function is
1MRS757256 F
PML630/Compact Load-Shedding Solution
Technical Manual