Ampcontrol VAA, User Manual

Page: 45 / 81

VOICECOM USER MANUAL ISSUE 4
-43-
Pre-Start Alarm Confirmation
If a pre-start alarm is successful the confirmation relay output will close. PSC1 is the pre-start confirmation output for
LINE 1 and PSC2 is the pre-start confirmation output for LINE 2. However, a pre-start alarm is successful if the
correct number of VAAs sound the alarm. This depends on:

The number of VAA supposed to be online (# of VAA’s to be online setting)

The number of VAAs that confirm sounding the pre-start alarm

The Service Factor (ServiceFactor # VAA’s offline setting)
The number of VAAs to be online setting should be set to the number of VAAs that that been installed on the
respective communication line, LINE 1 or LINE 2. The Service Factor allows for some of these VAAs (up to 5) to fail
to confirm sounding the pre-start alarm and still allow the confirm relay output to close.
1.
The VCA receives confirmation from the VAAs.
2. The minimum confirmations the VCA must receive equals the number of VAAs supposed to be online minus
the Service Factor ( min confirmations = # VAA’s to be online – ServiceFactor # VAA’s offline ).
a. If the number of VAA confirmations received by the VCA is greater than or equal to the minimum
confirmations value, the pre-start alarm is successful. The VCA Main Menu page will display the
text
PSW Healthy
. The confirm relay (PSC1 or PSC2) will close.
b. If the number of VAA confirmations received by the VCA is less than the minimum confirmations
value, the pre-start alarm has failed. The VCA Main Menu page will display the text
PSW
Active
until the pre-start request input is removed or the pre-start is blocked. The confirm relay
(PSC1 or PSC2) will not close.
Verifying the Pre-start Alarm While Active
Verifying the pre-start alarm operation is best done from the Line Status page for the line sounding the alarm. When
a pre-start alarm is active it is possible to see exactly which VAAs have given confirmation and which ones have
failed. This page also shows that state of the confirm relay for that line. This process is illustrated in Table 16.
1.
On the Line Status page, a █ indicates that a VAA is online at that address.
2. When a pre-start alarm is initiated, the █ symbol turns to an
o
for all 31 of the VAA addresses. This
o
remains
on the display until the confirmations are received.
3. When the VCA receives the confirmations from all or most of the VAAs, the
o
turns to either an
X
or a
P
. The
P
indicating that that VAA has confirmed sound the alarm and the
X
indicating that it has not. This display remains
while the pre-start input is asserted. Once the pre-start alarm input is de-asserted the Line Status display reverts
back to showing the solid blocks representing each VAA.