ABB Relion Technical Manual page 80

Section 5
Local Human-Machine-Interface LHMI
74
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
• 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. The acknowledgment/reset is performed via the
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 positive
edge triggered, not level triggered. This means that even if the button is
continuously pressed, the acknowledgment/reset only affects indications active
at the moment when the button is first pressed.
• Automatic reset
• The automatic reset can only be performed for indications defined for re-
starting mode with the latched sequence type 6 (LatchedReset-S). When the
automatic reset of the LEDs has been performed, still persisting indications will
be indicated with a steady light.
Operating sequence
The sequences can be of type Follow or Latched. For the Follow type the LED follow the
input signal completely. For the Latched type each LED latches to the corresponding input
signal until it is reset.
The figures below show the function of available sequences selectable for each LED
separately. For sequence 1 and 2 Follow type, the acknowledgment/reset function is not
applicable. Sequence 3 and 4 Latched type with acknowledgement are only working in
collecting mode. Sequence 5 is working according to Latched type and collecting mode
while Sequence 6 is working according to Latched type and re-starting mode. The letters S
and F in the sequence names have the meaning S = Steady and F = Flash.
At the activation of the input signal, the indication obtains corresponding color
corresponding to the activated input and operates according to the selected sequence
diagrams below.
1MRK 502 048-UUS A
Technical manual