ULT-
PLG™ Operating Instructions
5
Document no.
10180904
Operation (continued)
Frequency Count / Reset
Press the Frequency Count switch and count the number of flashes on the red LED. Each flash
represents 10kHz. To help to prevent crosstalk when multiple detectors are used for adjacent
loops, perform a frequency count on each detector to confirm the operation frequencies are
different. Following a frequency count cycle, the detector re-initializes
Automatic Sensitivity Boost
The
Automatic Sensitivity Boost
causes the sensitivity to increase following initial detection.
This feature is useful to prevent dropout when detecting high-bed vehicles. The sensitivity
returns to its normal setting after the vehicle exits the loop. Decimal point on the display
indicates ASB on.
Presence output
The Presence settings provides
two selections
, the output can be set for Infinite Presence
or Normal Presence. Infinite Presence causes the output to remain in detect mode as long
as the vehicle remains on the loop. Normal Presence causes the output to reset after 5
minutes
. DO NOT USE THE NORMAL PRESENCE SETTING UNLESS THE OPENING IS
PROTECTED BY A SECONDARY SAFETY DEVICE SUCH AS THE IRB-4X.
Detect-on-stop (DOS™)
The detect-on-stop affects B and /B (inverted B output). This function requires that a
vehicle come to a complete stop on the loop for the output to activate. This feature is
useful in cases where cross-traffic causes the detection.
Output B
Output B settings
allow Pulse on Entry, Pulse on Exit, Detect-On-Stop (DOS
®
) and Loop
Fault. The Detect-On-Stop feature requires that a Vehicle must come to a complete stop
over the loop for a minimum of 1 second (typical 1-2s) before Output B activates.
Fail Safe / Fail Secure
Fail Safe setting
causes the ULT-PLG to activate the Presence output in the event a loop
failure. Fail Secure setting will cause the ULT-PLG not to activate the Presence output in the
event a loop failure.
