CARLO GAVAZZI LDD1 Manual De Instrucciones página 12

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• When DIP SWITCH 1 is set to OFF, during startup the Loop Detector automatically measures

disturbances present on all four channels and selects the channel with best signal conditions.

Note that this procedure will be performed every time the Loop Detector is powered up or reset.

The white LED will show which channel has been selected (refer to the Indication Session on page 10)

DIP SWITCH 2 and 3 - Frequency channel selection

These two DIP switches are used to select which channel the Loop Detector should use. The channels

can only be selected when manual channel selection is set on DIP switch 1. When mode is set to

automatic channel selection, DIP switch 2 and 3 do not have any function.

DIP

Frequency Channel 1 Frequency Channel 2 Frequency Channel 3 Frequency Channel 4

switch

DIP SWITCH 4 - Turn-on delay

The Loop Detector has a Turn-on delay filter which can be enabled to help to avoid false vehicle

detections.

• When DIP SWITCH 4 is set to ON, the Turn-on delay is activated and any detections shorter than

2 seconds will not cause the output to activate. This function is suitable for detection of stationary

or slow moving vehicles.

• When DIP SWITCH 4 is set to OFF, the Turn-on delay is disabled and output has normal response

time. This function is suitable for detection of fast moving vehicles.

DIP SWITCH 5 - Automatically Sensitivity Boost (ASB)

High bed vehicles such as trucks and trailers normally gives a strong signal when the wheel axles are

inside the circumference of the loop. However the signal drops significantly when the loop is between

the wheel axles or between a truck and its trailer. When ASB function is enabled, the sensitivity is

boosted to avoid output deactivation when signal level is reduced, but high bed vehicle is still on top

of the loop.

• When DIP SWITCH 5 is set to ON, the ASB function is active and sensitivity is boosted to avoid

false deactivations. This mode is recommended for applications where detection of trucks and other

high bed vehicles is needed.

• When DIP SWITCH 5 is set to OFF, the Loop Detector uses normal sensitivity levels. This mode is

recommended for detection of normal cars, vans etc. with low bed height.

DIP SWITCH 6 - Failure mode

This function determines the state of the output relays, both during normal operation and when a failure

is detected in the system.

Note: When Fail Safe mode is selected, the operation of both output relays will be inverted. This

means that the Normally Open (NO) contact will become a Normally Closed (NC) contact and the

Normally Closed (NC) contact will become a Normally Open (NO) contact.

OFF

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