ASL INTERCOM VAR4 Operation Manual page 63

Note: In an ASL system with the surveillance tone level set to its default level of –12dB, the typical Note: In an ASL system with the surveillance tone level set to its default level of –12dB, the typical
thresholds values reported by the surveillance card are: thresholds values reported by the surveillance card are:
Input Threshold = 200–300mV Input Threshold = 200–300mV
Output threshold = 600–900mV Output threshold = 600–900mV
Refer to Section Refer to Section
configuration. configuration.
Suggested thresholds are only shown if the user is logged on as User 2 and the AC surveillance Suggested thresholds are only shown if the user is logged on as User 2 and the AC surveillance
has been set to 'LF' or 'HF' in Section has been set to 'LF' or 'HF' in Section
Tone Frequency Tone Frequency
Automatic updates to the VAR Router LCD display will occur after a short delay (aprox. Automatic updates to the VAR Router LCD display will occur after a short delay (aprox.
10 seconds). 10 seconds).
7. 7. It is possible to use the automatically suggested thresholds as commissioned values, or edit them in It is possible to use the automatically suggested thresholds as commissioned values, or edit them in
which case the VAR Router stops refreshing data from the selected mainframe. which case the VAR Router stops refreshing data from the selected mainframe.
8. 8. To edit, move to the threshold field to be modified and scroll it until the required value is displayed. To edit, move to the threshold field to be modified and scroll it until the required value is displayed.
9. 9. In either case, commission the amplifier by pressing the SELECT key, or cancel by pressing the BACK In either case, commission the amplifier by pressing the SELECT key, or cancel by pressing the BACK
key. key.
Note: Once commissioned the selected mainframe will use the new commissioned limits for fault Note: Once commissioned the selected mainframe will use the new commissioned limits for fault
detection. detection.
A continuous surveillance tone is required to set the threshold levels. The VAR Router will A continuous surveillance tone is required to set the threshold levels. The VAR Router will
!
!
automatically make all Pulsed Surveillance tones continuous during this set-up process. automatically make all Pulsed Surveillance tones continuous during this set-up process.
The system will return to the parent menu after 3 seconds on pressing the SELECT key, or immediately
on pressing the BACK key.
VAR4 / VAR12 / VAR20 - Operation Manual
"12.4 Surveillance Tone Generation "12.4 Surveillance Tone Generation
Range". Range".
Is sue: 03 complete, approved
Page 63 of 308 Page 63 of 308
Configuration" for surveillance tone level Configuration" for surveillance tone level
"6.3.4.2.1 Configuring an Amplifier's AC Surveillance "6.3.4.2.1 Configuring an Amplifier's AC Surveillance
ed