Plc Link Alarms - ABB ETL600 Instruction Manual

ABB Switzerland Ltd
HMI600 Alarm Text
• RF receive filter
missing
• O4LE hardware
alarm
• O4LE board missing
• Low RF level at
power amplifier
output
9.6.1.2.

PLC link alarms

HMI600 Alarm Text
• Low SNR
in channel 1
• Low SNR
in channel 2
• Low SNR
in channel 3
• No Rx pilot detected
in channel 1
• No Rx pilot detected
in channel 2
• No Rx pilot detected
in channel 3
9-18
1KHW001489-EN
Explanation and corrective actions
(the latter in italics)
The receive filter P4RX on position N78 of the channel
rack P7LC has been removed. This will degrade the
performance of the link due to missing selectivity in the
receive signal path.
Reinsert P4RX or - when the filter is not necessary for the
application - disable P4RX presence detection in the menu
'Alarm settings'.
At least one of the O4LE boards reports an alarm.
Switch off the power to ETL600 and switch it on again after
some seconds. If the error persists, find the faulty O4LE
board(s) by studying the TDM bus communication alarms
(section 9.6.4). Replace the faulty O4LE board(s).
At least one configured O4LE board doesn't answer or is
not plugged at the correct position in the rack.
Verify if all boards are firmly plugged in at the correct
positions in the P7LC subrack according to HMI600 (View
/ Display configuration). Switch off the power to ETL600
and switch it on again after some seconds. If the error
persists, find the faulty O4LE board(s) by studying the
TDM bus communication alarms (section 9.6.4). Replace
the faulty O4LE board(s).
The RF transmit signal measured at the RF hybrid is below
threshold or missing or the Tx alarm level is misadjusted.
Check the transmit signal path and/or readjust the alarm
threshold as described in menu Tuning and testing /
Adjust Tx alarm level.
Explanation and corrective actions
(the latter in italics)
The signal to noise ratio is below the alarm threshold on
APLC channel 1/2/3. The reasons may be excessive noise
on the power line or high attenuation of the RF signal on the
power line.
Reduce the SNR alarm threshold (Configuration / System
/ Alarm settings / SNR level APLC channel 1/2/3) and/or
increase the Tx power of the remote terminal.
ETL600 received no pilot on channel 1/2/3.
Make sure that the channel settings of both link terminals
match and that the signal attenuation of the power line is as
expected.
November 2005
ETL600
Troubleshooting