1MRS 751107-MUM
Protection Relay
Operator’s Manual
REX 521
25
3.4. LED indicators
3.4.1. Green indication LED (READY)
3.4.2. Yellow indication LED (START)
3.4.3. Red indication LED (TRIP)
Non-active LED: OFF Auxiliary supply voltage has been
disconnected.
Check that the auxiliary voltage is
disconnected before taking any further action.
Steady LED: READY Normal operation.
Blinking LED: IRF or
TEST MODE
Internal relay fault (IRF) has occurred or the relay is in
test mode
*)
. Internal faults are accompanied by an
indication message, provided the HMI panel is
operative.
*)
- Relay
- Function block
!
Non-active LED: OFF Normal operation mode.
No function has started.
Steady LED: START A protection function has started and an indication
message is displayed.
The start indication can be selected to be of latching/
non-latching type. Non-latching means that the indicator
is deactivated when the fault disappears while latching
means that the indicator remains lit until cleared by
pressing the
[C] button.
Should several protection functions start within a short
time, the last start is indicated on the display.
Blinking LED: BLOCK A protection function is blocked.
The blocking indication disappears when the blocking is
removed or when the protection function is reset. A
message indicating which function has been blocked
appears on the display. Should several protection
functions be blocked within a short time, the last
blocked function is indicated on the display.
Blocking indications have higher priority than start
indications.
Non-active LED: OFF Normal operation mode.
No function has tripped.
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