ABB Switzerland Ltd 1KHW001489-EN ETL600
HMI600 Alarm Text Explanation and corrective actions
(the latter in italics)
• G4AI hardware
alarm
An alarm is present on one of the G4AI boards
Check G4AI status for detailed information.
9.6.3.2. TPE link alarms
HMI600 Alarm Text Explanation and corrective actions
(the latter in italics)
• Low Rx guard level
• High Rx guard level
The level of the TPE guard signal is out the range set by
HMI600 (e.g.
Configuration / NSD600 / Alarm TPE1 /
Guard level alarm
), i.e. the AGC couldn’t restore the Rx
signal level to the correct range.
Make sure that
- the system level of the guard signal of the remote
equipment is equal to the one in the local equipment,
- the AGC gain [dB] is equal to the system level of the
guard signal [dBm0] minus the received guard level
[dBm].
- the AGC blocking level (Configuration / System / Alarm
settings) is some dB higher than the actual AGC gain.
• Low SNR
SNR not sufficient, i.e. the SNR is lower than the SNR
required for Pmc = 1% plus 3 dB.
Check line conditions or coupling devices.
• Neither trip nor
guard received
Either the trip or the guard signal have been suppressed
on their way over the communication channel.
Check line conditions or coupling devices.
• Both trip and guard
received
Probably discrete frequency injected at remote end.
Look for possible sources of injected signals at the
frequencies of the guard signal or the trip signals. Remove
the disturbing signals.
• Loop test failed
more than twice
The loop test failed at least three times.
Check remote equipment for correct operation. Check line
conditions or coupling devices.
9.6.3.3. TPE interface alarms
HMI600 Alarm Text Explanation and corrective actions
(the latter in italics)
• Outputs set to
predefined state
TPE outputs have been set to the predefined state as
specified by HMI600 (e.g.
Configuration / NSD600 /
TPE1 / Rx Output Duration [ms]
)
9-26 November 2005 Troubleshooting
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