ABB Relion 670 Series RES670, Technical Manual

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sequence of events is that the signals have been engineered in the disturbance
recorder.
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. In sequence 6, the restarting or reset mode means that upon occurrence of
any new event, all previous indications will be reset. This facilitates that only the LED
indications related to the latest event is shown.
Acknowledgment/reset
• From local HMI
•
The active LED 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 LED indications can also be acknowledged/reset via an input,
CLRLEDS
, to the function block LHMICTRL. This input can for example be
configured to a binary input operated from an external push button or a function
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 LED 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 follows the
input signal completely. For the Latched type, each LED latches to the corresponding
input signal until it is reset.
Section 5
1MRK 511 365-UUS A
Local Human-Machine-Interface LHMI
88 Phasor measurement unit RES670 2.1 ANSI
Technical manual