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VDB103/VDB103R THEORY OF OPERATION
The VDB103/VDB103R uses digital signal processing techniques to assess parameters inherent to inductive ground loops
in order to evaluate loop status and signal vehicle detection. As a loop operator, this technology gives you the benefit of
understanding the quality of your loop in real-time with advanced foresight and warning of deteriorating conditions.
This allows preventative measures to be taken to avoid down time and situations in which your drive-thru technologies
and services are hindered or incapacitated due to a failed or failing loop. While these events are unlikely, the advanced
warning system of the VDB103/VDB103R offers peace of mind that drive-thru operations will continue to be uninterrupted.
Through continuous measurement of the inductive ground loop, the VDB103/VDB103R determines the inherent electrical
characteristics of the loop which include: loop condition, connection quality, and the inductance of the loop. These three
parameters are evaluated to determine the Loop Status as seen in
, page 6. In the case of a deteriorating loop,
the VDB103/VDB103R offers insight into the underlying cause and the course of action to help troubleshoot your issue.
The vehicle detection portion of the VDB103/VDB103R operates through analysis of loop response to a stimulus provided
by the detector, which characterizes the inductance of a loop. The presence of a vehicle over the loop electromagnetically
interacts with the loop causing a change in inductance. The VDB103/VDB103R monitors these small inductance changes
in order to signal vehicle detection.
LOOP FAILURE AND INTERFERENCE
Inductive ground loops may eventually fail. The VDB103/VDB103R can remove the surprise of failure from operation
and allows you to prepare for such an event well in advance. Loop failure is the result of damage to the loop which can
include, but is not limited to: damage to area surrounding loop, severed loop or lead in wires, or insulation damage as a
result of aging and other environmental factors.
In addition, deteriorating connections between the loop and the VDB103/VDB103R can cause detection failure even
though the loop itself is in good condition.
The VDB103/VDB103R is essentially a large metal detector. Do not install the loop over any metallic object, surface,
or area. This includes installing the loop over rebar. Failure to adhere to this installation recommendation will result in
unexpected loop behavior.
ESD HANDLING INSTRUCTIONS
CAUTION
Contains parts and assemblies susceptible
to damage by Electrostatic Discharge (ESD)
This device is sensitive to electrostatic discharge and should be installed by personnel trained in ESD awareness. Proper
handling procedures include wearing anti-static wrist straps.
