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7
VAD-4 Installation and Operation Manual
INSTALLATION
Each input has a four-position configuration header and two jumpers. You can refer to the
jumper layout in the appendix for a detailed view. Each jumper is labeled (JPx, where x is
the status/logic input) and the header pins 1,2,3,4 are used to configure for WET or DRY
operation. The factory default configuration is for a DRY input (Switch, relay contact, open
collector) with jumpers between 1 & 2 and 3 & 4. In the DRY configuration, the “A” ter-
minal is ground while the “B” terminal is the cathode of the opto-isolator diode pulled up
to 5 volts through a 2.2K resistor.
If an output that you are interfacing with the VAD-4 provides its own voltage then you will
need to configure the corresponding input for the WET (floating) configuration. In the WET
configuration
the VAD-4’s opto-isolated inputs can be triggered by an input voltage from 5 VDC to 24
VDC. To change a status/logic input to WET (floating), remove both jumpers for the input’s
configuration header (labeled JPx) and place ONE jumper over pins 2 & 3. You may then
connect the positive voltage to the input’s “A” terminal (anode) and ground or minus volt-
age to the input’s “B” terminal (cathode).
NOTE: Please refer to the appendix for configuration examples and observe proper
polarity.
Silence Sensor input:
The stereo 10 k ohm unbalanced inputs are summed together and monitored for silence.
BOTH channels MUST go silent to trip an alarm. The alarm threshold is -25dBu. Connect
your unbalanced source equipment to either or both inputs (SS-L) and/or (SS-R) and tie the
ground to the GND terminal. If your source equipment is balanced, use the "+" and GND
terminal from the source. Your source equipments "-" (negative) terminal should never be
grounded. Shields should be tied to the “Chs Gnd” terminal.
The SS LED is illuminated when you have audio applied to the inputs. If no audio is pres-
ent or the audio is below the alarm threshold the SS LED will not be lit. When the SS is in
an alarm condition, the SS LED will flash.
Power Failure input:
Connect a user supplied 6 to 12 volts DC coaxial (2.1mm/ID, 5.5mm/OD, center positive)
power source to the power failure input connector labeled PF. An inexpensive 6 to 12 volt
DC wall transformer of any
current of 50mA or more will do. NOTE: The primary (120 VAC) of the wall transformer
should be connected to the utility company side of your service. An UPS is suggested to
power the VAD-4 during power outages.
Temperature Probe inputs:
Insert the optional temperature probes (25 foot cable) stereo mini (3.5mm) plug in to either
or both of the rear panel jacks labeled “TEMP” 1 – 2 (-40°F to +190°F/ -40°C to +85°C).
Extension cables may be used if more reach is needed. It is recommended that you limit the
total length of each cable to 50 feet.
NOTE: Probes should only be installed or removed when power is disconnected from
the VAD-4.
