Ampcontrol VAA, User Manual

Page: 26 / 81

VOICECOM USER MANUAL ISSUE 4
-24-
The VAA Status pages show the current operational status and programmable settings for each VAA connected to
the line. Figure 20 shows the status page for a VAA with serial number 00100 on Line 1, programmed to address 1.
1 Menu level 7 VAA battery current (positive value indicates charging
current, negative current indicates current being drawn
from battery)
2 Line number (Line 1 shown here) 8 Amplifier threshold setting (user programmable)
3 VAA address number (address 1 shown here) 9 Microphone gain and volume setting (user
programmable)
4 VAA serial number (matches number engraved
on VAA) 10 Maximum battery charging current (user
programmable)
5 Line voltage at that VAA 11 Digital communication status – indicator appears as a
spinning bar
6 VAA battery voltage
VAA Operational Status Values
Vline
– this is the line voltage measured at the VAA. The line voltage will depend on the power supply connected
to the line and the distance of the VAA from the power supply.
Vbat
– this is the VAA battery voltage. A fully charged battery should show a voltage of 6.6V to 6.7V. A low or
almost fully depleted battery will show a voltage of 5.9V to 6.0V.
Note: The VAA batteries have an over discharge protection feature. If the battery voltage falls below 5.9V, it will shut
itself off to prevent any permanent damage from occuring. The output will only turn on once the battery has received
enough charge to take it above the 6.0V.
Ibat
– this is the current going into/coming from the battery. The current will depend on whether the battery is
charging, fully charged or if the VAA’s amplifier is on (due to a PSA, voice message, etc.). A positive value denotes
current used to charge the battery. While charging, this value can read between 5mA to 40mA depending on the
battery charging current setting for the VAA. A negative current value indicates that current is being drawn from the
battery. While sounding a pre-start alarm Ibat can read down to -200mA.When the battery is fully charged and the
VAA is in “standby”, Ibat will be at or near 0mA.
VAA User Programmable Settings
Threshold
The threshold setting determines what level of audio present on the communication line will be amplified by the VAA
unit. The threshold can be set from 0 to 7 where 7 would provide the highest level of noise immunity. A higher
threshold value is used if there is some induced noise on the communications line causing the VAA units to turn on
unintentionally. As well as being a nuisance, VAAs turning on unintentionally can lead to unnecessary battery drain.
Figure 20 - VAA Status Page
2 L1 VAA# 1 Sn00100/
Vline:16.0V Thr:[ 3]
V bat: 6.6V Vol:[L3]
Ibat: 11mA Ich:[20]
3
4
1
5
6
7 8
9
10
2
11