Manual
VEK S4
FEIG ELECTRONIC GmbH
03/09
25
10 4-channel functions
The VEK S4 detector can also be used for presence detection with flexible direction recognition due to its
integrated 4-channel functions (4Ch). The parameters for use as a presence detector are explained in this
chapter.
Please note that changing the following parameters can influence the classification results or deactivate
classification modules.
10.1 Scanning speed (4Ch)
The response time of the detector is dependent on the number of active loop channels and the adjustable
interference filter. The scanning speed is doubled respectively by changing the multiplexer to two loop or
single loop operation. The scanning speed can be further increased by deactivating the interference filter
whereby the response time can be reduced from to normal 16 ms to 2 ms.
Attention:
The interference resistance of the system is also reduced for fast response times.
Activating the interference filter adversely affects the classification behaviour of the
classification modules.
Scanning mode
Interf. filter
Response time
4 loops
on
16 ms
2 loops
on
8 ms
1 loops
on
4 ms
4 loops
off
8 ms
(Default or factory setting)
2 loops
off
4 ms
1 loop
off
2 ms
It is also possible to deactivate individual loops without changing the reaction time. It must be noted that the
time window of the deactivated loop is assigned to another active loop. Distances between loops must also
be complied with here to avoid couplings which operate in the same time window.
Attention:
When a loop is deactivated, the classification module concerned is also deactivated.
10.2 Response sensitivity (4Ch)
The sensitivity for every channel in the range from 0.02% - 10.63%
∆
f/f can be selected in 256 steps. In
order to minimise interference, the sensitivity should be set as high as is necessary, i.e. the response
sensitivity should be set as high as possible.
The sensitivity setting is usually adjusted in large steps and the response threshold values are nor selected
higher than 120. Settings above 120 and fine adjustments are used for applications where vehicle
differentiations are required. For example, buses can be selectively detected with a large loop with the
dimensions 10.0 m x 2.5 m.
