Affected Hardware; Alarm Source; Alarm Hierarchy; Top-Level Alarms/Warnings - ABB ETL600 Instruction Manual

ABB Switzerland Ltd
9.3.5.

Affected hardware

The boards P4LT, O4LE and G4AI each have own means to detect
hardware faults. A transmitter alarm indicates faults in the RF units.
The DC converter B4LE is supervised by monitoring the voltages of its
supply outputs. Plugout loops are provided for RF hybrid and Rx filter.
9.3.6.

Alarm source

Apart from alarms caused by hardware faults, alarms can be caused
by the state of the signals at the interface connectors.
The most important of these is the RF connector. A link alarm will be
issued if the quality of the received RF signal is insufficient.
For other interface connectors, specific interface alarms are issued in
case the ETL600 detects that the signal at the connector is out of
specification. Examples of such signals are:
•
IRIG-B synchronization input
•
RS-232 data inputs
•
Teleprotection command inputs and outputs
9.3.7.

Alarm hierarchy

Four different hierarchic alarm levels can be distinguished:
•

Top-level alarms/warnings

•

High-level alarms/warnings

•

Low-level alarms/warnings

•

Detail alarms/warnings

9.3.7.1. Top-level alarms/warnings
These alarms/warnings relate to the ETL600 terminal as a whole.
There are 5 such alarms/warnings: System or cabinet alarm, Link
alarm, Hardware alarm, Interface alarm and Warning. LEDs on the
frontplate of P4LT show the status of each except Interface alarm.
Relays with switchover contacts are provided on P4LT for the top-level
System, Hardware and Link alarms.
Top-level alarms/warnings are derived from high-level alarms/warnings
by combining high-level alarms/warnings as shown in Fig. 9-3.
9.3.7.2. High-level alarms/warnings
High-level alarms relate to services of the ETL600 terminal: PLC,
TPE1, TPE2, DATA (Fig. 9-3).
Each high-level alarm is derived from a number of low-level alarms
according to Fig. 9-4. Pickup and hold times are specified as follows:
•
Hardware alarms:
•
Interface alarms:
•
Link alarms:
9-8
1KHW001489-EN
Pickup and hold times for hardware alarms
can be entered via HMI600.
Same pickup and hold times as for hardware
alarms are effective.
Pickup and hold times for link alarms can be
entered via HMI600.
November 2005
ETL600
Troubleshooting