Led Indicators; Green Indication Led (Ready); Yellow Indication Led (Start); Red Indication Led (Trip) - ABB REX 521 Operator's Manual

1MRS 751107-MUM
3.4.
3.4.1.
3.4.2.
3.4.3.
Protection Relay
Operator's Manual

LED indicators

Green indication LED (READY)

Non-active LED: OFF
Steady LED: READY
Blinking LED: IRF or
TEST MODE

Yellow indication LED (START)

Non-active LED: OFF
Steady LED: START
Blinking LED: BLOCK

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.
Normal operation.
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
Normal operation mode.
No function has started.
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
[C]
pressing the button.
Should several protection functions start within a short
time, the last start is indicated on the display.
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.
Normal operation mode.
No function has tripped.
REX 521
25