ABB RELION 630 Series Technical Manual page 47

1MRS757256 F
PML630/Compact Load-Shedding Solution
Technical Manual
When a LED is acknowledged, all indications that appear before the indication with
higher priority has been reset, are acknowledged, independent of if the low priority
indication appeared before or after acknowledgment. In
sequence when a signal of lower priority becomes activated after acknowledgment
has been performed on a higher priority signal. The low priority signal is shown as
acknowledged when the high priority signal resets.
Activating
signal GREEN
Activating
signal RED
LED
Acknow
IEC09000313 V1 EN
Figure 16: Operating sequence 3, 2 colors involved
If all three signals are activated the order of priority is still maintained.
Acknowledgment of indications with higher priority acknowledges also low priority
indications, which are not visible according to
Activating
signal GREEN
Activating
signal YELLOW
Activating
signal RED
LED
Acknow.
IEC09000314 V1 EN
Figure 17: Operating sequence 3, three colors involved, alternative 1
If an indication with higher priority appears after acknowledgment of a lower priority
indication the high priority indication is shown as not acknowledged according to
Figure 18.
R
R
Figure
Y
G R R
Section 3
Basic functions
Figure 16 it is shown the
G
IEC09000313_1_en.vsd
17.
Y
IEC09000314-1-en.vsd
41