6 FIXED FUNCTION LEDS
Four fixed-function LEDs on the left-hand side of the front panel indicate the following conditions.
● Trip (Red) switches ON when the IED issues a trip signal. It is reset when the associated fault record is
cleared from the front display. Also the trip LED can be configured as self-resetting.
● Alarm (Yellow) flashes when the IED registers an alarm. This may be triggered by a fault, event or
maintenance record. The LED flashes until the alarms have been accepted (read), then changes to
constantly ON. When the alarms are cleared, the LED switches OFF.
● Out of service (Yellow) is ON when the IED's functions are unavailable.
● Healthy (Green) is ON when the IED is in correct working order, and should be ON at all times. It goes OFF if
the unit’s self-tests show there is an error in the hardware or software. The state of the healthy LED is
reflected by the watchdog contacts at the back of the unit.
6.1
TRIP LED LOGIC
When a trip occurs, the trip LED is illuminated. It is possible to reset this with a number of ways:
● Directly with a reset command (by pressing the Clear Key)
● With a reset logic input
● With self-resetting logic
You enable the automatic self-resetting with the Sys Fn Links cell in the SYSTEM DATA column. A '0' disables self
resetting and a '1' enables self resetting.
The reset occurs when the circuit is reclosed and the Any Pole Dead signal has been reset for three seconds
providing the Any Start signal is inactive. The reset is prevented if the Any Start signal is active after the breaker
closes.
The Trip LED logic is as follows:
Any Pole Dead
Trip LED Trigger
Any Start
Sys Fn Links
Trip LED S/Reset
&
1
Any Trip
S
R
Q
Reset Relays/LED
V01211
Reset
3s
Figure 272: Trip LED logic
P543i/P545i Chapter 19 - Digital I/O and PSL Configuration
P54x1i-TM-EN-1 491
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