ABB Relion 670 Series Technical Reference Manual page 71

1MRK505222-UUS C
Technical reference manual
= No indication
IEC05000506 V1 EN
Figure 10: Symbols used in the sequence diagrams
Sequence 1 (Follow-S)
This sequence follows all the time, with a steady light, the corresponding input signals.
It does not react on acknowledgment or reset. Every LED is independent of the other
LEDs in its operation.
Activating
signal
LED
IEC01000228 V2 EN
Figure 11: Operating sequence 1 (Follow-S)
Sequence 2 (Follow-F)
This sequence is the same as sequence 1, Follow-S, but the LEDs are flashing instead
of showing steady light.
Sequence 3 (LatchedAck-F-S)
This sequence has a latched function and works in collecting mode. Every LED is
independent of the other LEDs in its operation. At the activation of the input signal, the
indication starts flashing. After acknowledgment the indication disappears if the signal
is not present any more. If the signal is still present after acknowledgment it gets a
steady light.
Activating
signal
LED
Acknow.
IEC01000231 V1 EN
Figure 12: Operating sequence 3 (LatchedAck-F-S)
= Steady light = Flash
en05000506.vsd
Section 3
Local HMI
IEC01000228_2_en.vsd
en01000231.vsd
65