EDI DEFLECTOMETER LMD301 Manuale operativo - Pagina 8
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time starts counting down when a vehicle enters the loop detection area. During the Delay
time the DET indicator will flash two times per second and the DEFLECTOMETER
display the letter "d". Delay time can be overridden by a True signal at the Timer Control
input.
2.4.2 EXTEND TIMING
For each channel, an extend time of 0.25 to 15.75 seconds can be set via the EXTEND DIP
switches. The numeric sum of the switches in the On position is equal to the Extend time.
Call Extend time starts counting down when the last vehicle clears the loop detection zone.
During the Extend time the DET indicator will flash four times per second and the
®
DEFLECTOMETER
during the Extend time period causes the Extend timer to be reset and the output
maintained. The Timer Control input has no effect on this mode.
2.4.3 TIMER CONTROL INPUT
A Timer Control input is provided for to modify the operation of the Delay Timing functions.
The application of an AC voltage will inhibit the Delay timing function as described in
section 2.4.1. When the Timer Control Input is active (True) the decimal point of the
channel DEFLECTOMETER
The Timer Control input is primarily provided for downward compatibility.
2.5 MISCELLANEOUS
2.5.1 CHANNEL OFF
If a channel is not to be used, it may be switched off (disabled) by setting the Operational
Mode to OFF. See section 2.2.6.
2.5.2 RETUNE OR RESET A CHANNEL
Press the MODE and FREQ buttons simultaneously to reset the channel. This will clear any
previous loop fault indication and cause the channel to retune.
2.5.3 FACTORY DEFAULT SETTINGS
Press the MODE and FREQ buttons simultaneously while first applying power to the unit to
reset all channels to the factory default settings.
2.6 LOOP FAULT MONITORING
The LMD Series Loop Monitor continuously checks the integrity of the loop. The system is
able to detect open circuit loops, shorted loops, or sudden changes in inductance
exceeding 25% of the nominal inductance.
2.6.1 CURRENT FAULT
If a fault is detected, both the DET (Red) and FLT (Yellow) LEDs continuously emit a
sequence of flashes and the DEFLECTOMETER
fault is identified by a different flash sequence followed by a one second pause:
Eberle Design Inc.
LMD301, LMD302, and LMD304
Series Operations Manual
will display the letter "E". Any vehicle entering the loop detection zone
®
display will illuminate.
Factory Defaults
Sensitivity Level
Operational Mode
Frequency Level
6
Short Presence
High
®
will display the letter "F". Each type of
®
will
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