ETL600 1KHW001489-EN ABB Switzerland Ltd
• Warnings: A pickup time of 10 s and a hold time of 1 s
are used for warnings.
Low-level alarms
Pick up time Hold time
High-level alarm
1
Fig. 9-4 Derivation of high-level alarms
9.3.7.3. Low-level alarms/warnings
Most low-level alarms/warnings are directly generated by a hardware
device or a software process. However, some are derived by
combining a number of detail alarms. This is the case for most alarms
generated by the slave boards O4LE and G4AI.
Low-level alarms/warnings are recorded by the event recorder and are
contained in the polled alarm messages.
9.3.7.4. Detail alarms/warnings
Detail alarms/warnings are directly generated by a hardware device or
a software process on the O4LE and G4AI boards.
Detail alarms/warnings are neither recorded by the event recorder nor
contained in the polled alarm messages. However, they are displayed
in the HMI600 status and alarm views.
9.3.8. Alarm outputs
9.3.8.1. Alarm status display
The status display of HMI600 shows all alarms of all levels. In addition,
the three User alarms (refer to section 9.3.8.3.2) are also shown.
9.3.8.2. LEDs
All alarm LEDs are red, Warning LEDs are yellow. There are
alarm/warning LEDs on the frontplate of the following boards: P4LT,
G4AI, O4LE, RF hybrid, RF combiner.
All alarm and warning LEDs are switched on/off only after the
corresponding pickup or hold time has elapsed, refer to section
9.3.7.2.
9.3.8.2.1. LEDs on P4LT
Refer to Table 9-3.
Troubleshooting November 2005 9-9
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