ABB Relion 650 Series Engineering Manual page 71

1MRK 511 245-UUS A
LED operation mode LatchedReset-S
S1
S2
S3
S4
tMax
tRestart
Auto-
Reset
Man-
Reset
S1LED
S2LED
S3LED
S4LED
Illumination =>
IEC08000400 V1 EN-US
Figure 51:
This mode is useful to monitor signals that are involved in case of a disturbance, see
signal state after the disturbance allows a fast overview about the disturbance. To get always the
situation of the last occurred disturbance, the LEDs are reset after a predefined time (tReset). So
this is the longest time a disturbance can be monitored by the LED situation.
In case a second disturbance occurs before the tReset time has elapsed, see
that are still ON at the end of tReset will return to ON with the next application configuration cycle
after tReset. To clear these LEDs, a second timer tMax is used. TMax is started when the first
signal of the disturbance changes to ON. tMax is stopped, when tReset could clear all LEDs.
A disturbance runs for a maximum of some seconds, while tReset can be in the range of 60 to 90
seconds.
The timer tReset and tMax are configured in Parameter Setting tool as part of the function block
LEDGEN
650 series
Engineering manual
= Steady = Flash
LHMI: LED operation mode LatchedReset-S
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IEC08000400.vsd
Section 6
Local HMI engineering
Figure 51. The
Figure 52, the signals
65