ABB Switzerland Ltd 1KHW001489-EN ETL600
LED Colour Description
RDY Green:
Lights continuously while the system is in
normal operating condition.
Otherwise it is flashing.
U
Yellow
Lights up when the top-level
Warning is
active.
SYS Red
Lights up when the top-level
SYSTEM alarm
is active.
LNK Red
Lights up when the top-level
LINK alarm is
active.
HW Red
Lights up when the top-level
HARDWARE alarm is active.
P4LT Red
Lights up when
P4LT hardware alarm or
P4LT interface alarm is active.
Table 9-3 The six LEDs on the frontplate of P4LT
9.3.8.2.2. Alarm LED on G4AI
The G4AI alarm LED (red) lights when a hardware alarm or an
interface alarm has been detected on the board.
9.3.8.2.3. Alarm LED on O4LE
The O4LE alarm LED (red) lights when a hardware alarm has been
detected on the board (There are no interface alarms for the O4LE
board).
9.3.8.2.4. Alarm LED on RF hybrid and on RF Combiner
These red LEDs signal a Tx level alarm. They light up if the level of the
RF transmit signal is lower than an adjustable threshold.
9.3.8.3. Alarm relays
Electromechanical relays are specially suited for alarms because
closed relay contacts can signal an alarm even if the system is not
powered. There are alarm relays on the following boards: P4LT,
R1BC, G4AI, O4LE.
9.3.8.3.1. Alarm relays on P4LT
The three alarm relays on P4LT are equipped with switchover contacts
and controlled by three top-level alarms:
• SYSTEM or CABINET alarm,
• HARDWARE alarm,
• LINK alarm.
The relays are de-energized if the respective alarms are present.
9-10 November 2005 Troubleshooting
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