ABB Relion 670 series, Technical Reference Manual, Page: 70 / 1232

via the reset button and menus on the local HMI. See the operator's manual
for more information.
• From function input
•
Active indications can also be acknowledged or reset from an input, RESET,
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 or reset only affects indications
active at the moment when the button is first pressed.
• Automatic reset
•
Automatic reset can only be performed for indications defined for re-starting
mode with the latched sequence type 6 (LatchedReset-S). When automatic
reset of the LEDs has been performed, still persisting indications will be
indicated with a steady light.
Operating sequences
The operating 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.
Figure 10 show the function of available sequences that are selectable for each LED
separately.
• The acknowledgment or reset function is not applicable for sequence 1 and 2
(Follow type).
• 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.
• 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 = Flashing.
At the activation of the input signal, the indication operates according to the selected
sequence diagrams.
In the sequence diagrams the LEDs have the characteristics as shown in figure 10 .
Section 3
1MRK505222-UUS C
Local HMI
64
Technical reference manual