Maintenance; Periodic Functional Checks; Check Input Power Supply Voltage; Check Alarm Status For Etl600 Element Management Networks - ABB ETL600 Instruction Manual

ABB Switzerland Ltd
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The red LED ('SYS', System or Cabinet alarm) at the middle right
side: It operates when either the hardware alarm (HW) or the link
alarm (LNK) operates or when an interface alarm is present.
Refer to chapter 9 , section 9.6 ' List of alarms and corrective actions'
for details about causes of alarms and remedies.
In case the optional alarm module R1BC is used, the contacts will also
operate for the above criteria if the corresponding high level alarms of
the subsystems were selected by means of the HMI600.
The alarm polling or event recorder functions of the HMI600 can be
used to see the details of the alarms.
8.3.

Maintenance

All the modules of ETL600 are subjected to a comprehensive final
functional testing after manufacturing. The complete PLC equipment is
then calibrated and tested as a unit before leaving the works.
Most functions such as generation of pilot, AF filtering, AF to RF
conversion, RF filtering before power amplifier, RF & AF channel
settings etc. are performed digitally by software using DSPs. Hence
these operations are not subject to ageing. The processor includes a
number of self-monitoring functions which - together with the NSD600
loop test performed at periodic intervals - check the operation of the
RF-converter module and the availability of the communications
channel as a whole.
The parameters governing the operating characteristics are all
determined by the HMI600. The stability of these settings and thus
also of the equipment as a whole is assured over a long period of time.
Nevertheless, testing at periodic intervals is recommended. The
frequency of testing depends very much on the operating conditions in
the particular installation, but should not be less than once every two
years. The following periodic measurements are recommended.
8.3.1.

Periodic functional checks

It is important that the reasons for readings, which diverge widely from
values recorded during commissioning, are found, even if this means
checking the entire equipment.
Checking and testing must be carried out by qualified and authorized
personnel only, using suitable instruments. Incorrect settings can
impair the proper operation of the equipment.
8.3.1.1.

Check input power supply voltage

Verify that the internal power supply voltage of 48 VDC on the test
point of B5LA/B5LC is within tolerance.
8.3.1.2.

Check alarm status for ETL600 element management networks

To check the alarm status of a number of ETL600 terminals forming an
element management network, the function 'Alarm polling' (menu
8-6
1KHW001489-EN
November 2005
ETL600
Operation and Maintenance