EDI ORACLE 2E, Руководство по эксплуатации, Страница: 23 / 30

ORACLE SERIES 2E, 2EC, 4E, 4EC, 4H
Operations Manual
Eberle Design Inc. Page 18
inductance too large. A double flash followed by a pause, indicates a shorted loop or loop
inductance too small (see section 3.5).
4.2.3 DETECTOR DOES NOT DETECT ALL VEHICLES
Sensitivity too low : Select sensitivity by utilizing the LCD DEFLECTOMETER
®
visual aids
(see section 3.2.1). Using the DEFLECTOMETER
®
visual aids insures that all vehicles,
including motorcycles and hi-bed trucks will be detected. You can also manually increase
sensitivity to a desired level.
4.2.4 DETECTOR IS NOISY/CHATTERS/GIVES FALSE DETECT CALLS
Two or more detector units are interfering with each other (crosstalk). Check frequency
settings on detectors which are connected to loops closest to the ORACLE exhibiting
crosstalk; several may be showing signs of crosstalk themselves. Adjust the frequency
levels utilizing the LCD (SET UP Freq menu) and front panel toggle switches on all units
affected so that the largest possible margin exists between frequencies of loops positioned
the closest. The rule of thumb is to separate the loop frequency by at least 5 kilohertz.
When in the “SET UP Freq” menu, not only can you review the actual frequency, but see a
frequency stability graph below the frequency. When changing frequencies, a thinner line
on the graph mean less interference is being seen by the detector and a thicker or uneven
line represents more interference being seen by the detector.
Basically a thin smooth graph offers a more optimum frequency selection over a thick or
uneven line. For optimal operation, select the frequency level with the lowest value of Q
∆
f.
For values of Q ∆ f higher than 15-20, the Noise Filter option (see Section 2.1.3.2) should be
considered.
4.2.5 POOR LOOP CONNECTIONS
Loop connections are very important to the satisfactory operation of the ORACLE. All
connections whether they are in the cabinet or at the roadside must be secure preferably
soldered and, in the case of connections made at the roadside, waterproofed to prevent
shorting to ground.
4.2.6 POOR LOOPS
Loops that have become degraded due to the passage of traffic may cause the ORACLE to
exhibit crosstalk-like symptoms. It may be possible to reduce the sensitivity while
maintaining adequate detection of vehicles. However, the ideal solution is to replace the
loop.
4.3 COMMUNICATIONS PORT ERROR DISPLAY (X SERIES ONLY)
During normal operation transmit and receive status are displayed along with an “
F
” for
front panel serial port, or a “ B ” for backplane serial port.
4.3.1 RECEIVE
When a character is received an “ R ” is displayed along with the port it was received on. “ R
F ” indicates that a character was received on the front panel serial port. “ R B ” indicates
that a character was received on the backplane serial port.
4.3.2 TRANSMIT
When a character is transmitted a “ T ” is displayed along with the port it was transmitted out
of. “ T F ” indicates that a character was transmitted out of the front panel serial port. “ T B ”
indicates that a character was transmitted out of the backplane serial port.
4.3.3 SERIAL PORT ERRORS
Serial port errors are displayed as a single reversed character along with an “
F
” for front
panel serial port, or a “ B ” for backplane serial port.