EMX Industries, Inc.
Tech support: 216-834-0761
6/6
ULT-PLG_Rev1.8_082619 [email protected]
Troubleshooting
Symptom
Possible Cause
Solution
Green LED not on
No power
Check the power supplied to the ULT-PLG on pins 9 and 10.
Voltage should read between 12-24 VDC.
Green LED
fast flash
Loop wire shorted or open
1.
Check the loop resistance with a multimeter to confirm a
reading between 0.5 ohms and 5 ohms. If the reading is
outside of this range, replace the loop. The reading
should be steady.
2.
Check loop connections to terminals.
3.
Press the FREQUENCY COUNT / RESET button.
Green LED
flashes fast twice
intermittently
Loop wire was previously
shorted or open
1.
Check the loop resistance with a multimeter to confirm a
reading between 0.5 ohms and 5 ohms. If reading is
outside of this range, replace the loop. The reading
should be steady.
2.
Check loop connections to terminals.
3.
Press the FREQUENCY COUNT / RESET button.
Red LED
on constantly
(stuck in detection
mode)
Faulty loop
Poorly crimped connection
or loose connection
Perform a megger test from loop lead to ground, it should be
more than 100 megaohms.
Check loop connections to terminals. Verify splices are
properly soldered and sealed against moisture.
Observe ULTRAMETER
™
display. The level indicated on the
display indicates residual frequency shift from vacant loop to
vehicle presence. Press FREQUENCY COUNT / RESET button to
re-initialize the detector.
Detector detects
intermittently
when no vehicle is
on the loop
Faulty loop
Poorly crimped connection
or loose connection
Cross-talk between
multiple loop detectors
Loop not securely installed
to prevent movement of
loop in pavement.
Perform a megger test from loop lead to ground, it should be
more than 100 megaohms.
Check loop connections to terminals. Verify splices are
properly soldered and sealed against moisture.
Set multiple loops to different frequencies.
Verify that loop is securely installed in pavement and that site
is in good condition preventing movement of loop wires.
No detection
Loop wire shorted or open
Loop sensitivity set too low
1.
Check loop resistance with a multimeter to confirm a
reading between 0.5 ohms and 5 ohms. If the reading
is outside of this range, replace the loop. The reading
should be steady.
2.
With vehicle on loop, observe ULTRAMETER
™
display.
Set sensitivity level to the level indicated on the display.
EMX Industries, Inc. products have a warranty against defects in materials and workmanship for a period
of two years from date of sale to our customer.
Warranty
