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10
VAD-2 Plus Installation and Operation Manual
INSTALLATION
CAUTION!
Some features may
require the removing of
the chassis cover.
Caution should be
observed. Hazardous
voltages may be present
on the printed circuit
board!
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Installation
Installation of the VAD-2 Plus in high RF environments should be performed
with care. Shielded cable is suggested for all control and audio I/O. All shields and
station ground should be tied to the “Chs Gnd” terminal. It is recommended that all
cables connected to the VAD-2 Plus be looped through ferrite cores to suppress RF.
Surge protection with RF filtering such as the Tripp Lite “ISOBAR 4 or 6” is also
suggested for the wall transformer. The purchase of an inexpensive UPS will pro-
vide back-up power in case of a power outage.
Connecting your equipment:
The VAD-2 Plus interfaces to your equipment through the rear panel plug-in
euroblock screw terminals. Follow the chassis labels for the desired temp probe,
power failure input, relays, inputs and audio connections. Remove about 1/8” of
insulation, insert the wires into the plugs, and tighten the screws. Be certain that no
bare wires are exposed. The terminals accommodate wire sizes from 18 - 28 AWG
solid or stranded wire.
Status Inputs:
Each status inputs can be configured to accept either a contact closure (dry,
default) or a (wet). Each input is equipped with a four-position header. The IN-1
jumpers support status input one, while IN-2 supports status input two. Each input is
labeled IN-x (where x is the status input) and the header pins are labeled from left to
right 1,2,3,4 as viewed from the rear. The factory default is for a DRY input (switch,
relay contact) with jumpers between 1 & 2 and 3 & 4. Attach your dry contacts to
the desired status channels StxA and STxB (where x is the status input) terminals.
Note: In the dry configuration, the “A” terminal is ground while the “B” ter-
minal is the cathode of the opto diode (pulled up to 5 volt through 2.2K resis-
tor). To change the status input to WET (with user supplied voltage between 5
and 24vdc and may be increased with a user provided external resistor),
remove both jumpers and place ONE jumper over pins 2 & 3. Connect the
positive voltage to terminal “A” (anode) and ground or minus voltage to termi-
nal “B”(cathode).
NOTE: Please observe proper polarity.
Silence Sensor inputs:
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 set at -20dBu. Connect your unbalanced source equipment to either or both inputs
(SSL) and/or (SSR) and tie the ground to the GND terminal. If your source equip-
ment 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.
When the SS is in an alarm condition, the SS LED will flash. NOTE: The SS led
will be extinguished with no audio input. The time delay is user programmable for
10, 30, 60 (seconds) 1.5, 2, 2.5, 3, 4, & 5 minutes. Factory default is (0) OFF.