Ampcontrol VAA, User Manual

Page: 47 / 81

VOICECOM USER MANUAL ISSUE 4
-45-
Pre-start Alarm Operation Examples
Example 1 – a successful pre-start alarm
The system:

VAAs connected: 20

# of VAA’s to be online: 20

ServiceFactor # VAA’s offline: 0
1. Figure 31 shows the Line Status page before the pre-start
alarm is initiated.
2. A pre-start alarm is initiated on LINE 1 by asserting the
PSR1 digital input as indicated by the
RQo-o
graphic.
3. Once all of the VAA confirmations have been received, the
Line Status page will then appear shown in Figure 32. It can
be seen that all 20 VAA units have confirmed as indicated by
the
P
’s, each representing confirming VAA.
4. The
OPo-o
graphic indicates that the pre-start confirm relay is energised because the pre-start alarm has
sounded successfully.
Example 2 – a failed pre-start alarm
The system:

VAAs connected: 20

# of VAA’s to be online: 20

ServiceFactor # VAA’s offline: 0
1.
The settings are kept the same as example 1.
2. Figure 33 shows how the Line Status page once all the
confirmations have been received. Note the two
X
symbols,
indicating that VAAs at addresses 7 and 20 failed to confirm
the pre-start alarm.
3. The confirmation output will not close,
OPo/o
, because two
VAA failures have been detected. The Service Factor is set to
0; therefore the system will not tolerate any failed VAAs. Setting the Service Factor to 2 would have made this
pre-start alarm operation successful.
2 Line 1 [20] VAA’s
PSW RQo/o OPo/o
█ █ █ █ █ █ █ █ █ █ █ █ █ █ █
█ █ █ █ █
----- ----- -
2 Line 1 [20] VAA’s
PSW RQo-o OPo-o
PPPPP PPPPP PPPPP
PPPPP ----- ----- -
2 Line 1 [20] VAA’s
PSW RQo-o OPo/o
PPPPP P
X PPP PPPPP
PPPP X ----- ----- -
Figure 31
Figure 32
Figure 33