Ampcontrol VAA, User Manual

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VOICECOM USER MANUAL ISSUE 4
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PC Software
The Controller is supplied with the VCA Message Bank Editor Windows PC software. The software enables the user
to create, edit and download voice message banks to the Controller. A separate PC program is required for the
recording of individual voice message audio files before the voice message bank can be created.
Modbus
Most of the Controller’s functionality can be controlled and monitored via a Modbus protocol connection. This
includes playing voice messages and reading VAA operational parameters of all connected VAA units. This Modbus
data can be used for trending via a PLC, allowing for preventative maintenance by giving early indication of cable
failures or VAA batteries that may be ready replacement.
The VoiceCom Amplifier – VAA Overview
Key Functions
The VAA sounds pre-start alarms and amplifies audio signals like voice messages and station-to-station
communication. Unlike other communication systems where pre-start alarm and signalling tones are transmitted via
the audio line, the VAA generates all pre-start alarm tones locally. The VAA has four volume levels and two
microphone gain levels that can be configured, depending on the level of background noise. The VAA also has a
seven level threshold setting that prevents unwanted noise from being amplified.
Keypad
Each of the four VAA keypad buttons also generates a different tone when pressed. The SPEAK button generates a
brief tone when pressed and then a higher pitch tone when released to get the attention of other users. Pressing the
CALL LOCAL button also generates a tone that can also be used to get the attention of other users. The CALL
EXCHANGE button generates a low frequency tone for a short duration that can be used to open telephone circuits.
The FUNC button, when pressed, closes one of the Controller’s digital outputs. This output can be used to trigger an
external event, such as prompting the PLC to initiate certain voice messages.
Display
The LCD display cycles through the VAA’s key operating parameters such as the communication line voltage, battery
voltage, battery current and a system digital communication “heart beat”.
Local Configuration
As well as being configurable from the Controller, the VAA’s programmable settings can also be changed at the VAA
using the unit’s programming mode.
Advanced Battery Management
The VAA’s battery management facility allows the battery’s charging current to be set by the user. The setting of the
battery charging current depends on factors such as the output of the I.S. power supply and the number of VAA units
connected to the communication line. The VAA can effectively disconnect the battery if its voltage falls below a pre-
set level to prevent permanent battery cell damage.