ORACLE SERIES 2E, 2EC, 4E, 4EC, 4H
Operations Manual
Eberle Design Inc.
Page 7
feature. Therefore, when this feature is enabled in one channel, its paired channel is also
set to the same state.
For the ORACLE 2E and 2EC model, 3
rd
Car mode links channels 1 and 2 together. For the
ORACLE 4E, 4EC, and 4H models, 3
rd
Car mode links channels 1 and 2 together, and links
channels 3 and 4 together. When a vehicle is detected on only one of the two linked
channels, the DETECT LED will flash 10 times a second. The “3
rd
Car” mode is intended to
be used in Protected / Permissive left turn situations. The likely installation is a stop bar
loop for the left turn lane connected to one channel, a queue detection loop (with a small
amount of delay time programmed) for the left turn lane connected to the other channel,
and the output of either channel connected to the Vehicle Call input for the protected
movement of the traffic controller.
As the first vehicle enters the left turn lane it will drive over the queue detection loop. Since
there is no vehicle over the stop bar loop, there is no call output generated. When the
vehicle advances to the stop bar loop, still no output is generated because there is now no
vehicle over the queue detection loop. When traffic in the left turn lane backs up and
occupies both the queue detection loop and the stop bar loop this will cause the detector to
generate a CALL to the traffic controller to service the protected movement for the left turn.
The spacing between the stop bar loop and the queue detection loop controls the size of
the queue needed to generate a call to the protected movement of the controller. The delay
time on the queue detection loop should be sufficient that a vehicle physically overlapping
this loop and the stop bar loop do not generate a CALL.
2.1.10.2 DIRECTIONAL LOGIC
Each channel’s Directional Logic setting can be enabled by selecting the “Direction” option
in the “Paired Channels” menu. This means that it takes two channels to implement the
feature. Therefore, when this feature is enabled in one channel, its paired channel is also
set to the same mode. Channel 1 is paired with Channel 2. In the ORACLE 4E, 4EC, and
4H models Channel 3 is also paired with Channel 4.
Directional logic starts with a CALL on one channel. This channel will go into a pending
state, DETECT LED flashing 10 times a second and NO output call. When both of the
paired channels have detection, the last channel to have detection will output a CALL until
the detection for the last channel ends, even if the detection ends for the first channel.
This feature is intended to be used in freeway ramps for wrong way detection and left turn
lanes where other movements in the intersection tend to clip the detection zone of the left
turn lane. The likely installation is two loops, one after the other in the same lane, spaced
anywhere from slightly overlapping to 5 or 6 feet apart. Under normal conditions both
outputs can never be on at the same time. However, if one of the loops faults, the output for
the faulted loop will come on and stay on until the failure is corrected, and the loop without
the fault will output a call whenever it is occupied. The channel which received the loop
failure will indicate the type of loop fault on the FAULT LED (See section 2.2.4).
2.1.11 SET FACTORY DEFAULT SETTINGS
Simultaneously pressing the Channel 1 “UP/DOWN” switch Down and the Channel 2
“UP/DOWN” switch Up while cycling power will reset the detector to factory default
positions.
2.2 OPERATIONAL
2.2.1 CHANNEL OUTPUT CONTROL
Each channel has one of four output modes to choose from in the SET UP menu; Off, On,
Call, or Disabled.
Off
: When set to the “Off” mode, the channel output is set continuously in the No Call state
regardless of the presence or absence of vehicles over the loop. The loop oscillator is