EMX MVP D-TEK - Troubleshooting

MVP D-TEK™ Operating Instructions 8
Document no. 10000104
Troubleshooting
Symptom
Possible cause
Solution
Green Indicator is not lit
No input voltage
1. Check voltage on pins 1 and 2
2. Check wiring to detector.
3. Verify voltage used matches
voltage marked on unit
Green Indicator flashes
Loop wire shorted or
disconnected
Check loop resistance on pins 7 & 7,
it should be less than 5 ohms and
more then 0.5 ohms.
Green Indicator flashes
with two consecutive
fast blinks
Loop wire was
temporarily shorted or
disconnected
Check loop resistance on pins 7 and
8, it should be less than 5 ohms and
more than 0.5 ohms. The reading
should be steady.
Detector stays in detect
mode after the vehicle
leaves the loop and fails
to un-detect.
1. Faulty loop
2. Poorly crimped
connections
3. Loose connections
1. Perform megger test from
loop lead to ground, should
be >100 mega ohms
2. Check loop connections to
terminals
3. Check splices are properly
soldered and sealed against
moisture
Detector detects
intermittently even
when there is no vehicle
on the loop
1. Faulty loop
2. Poorly crimped
terminals
3. Loose connections
4. Cross-talk between
adjacent loop
detectors
5. Loop not securely
installed to prevent
movement of wire in
pavement
1. Perform megger test between
loop lead and ground, the
reading should be greater than
100 mega ohms.
2. Check that loop is tightly
connected to terminals
3. Check that splices are tightly
soldered and sealed against
moisture
4. Set adjacent loops to different
frequencies.
5. Verify that loop is securely
installed in pavement and that
site is in good condition
preventing movement of loop
wires.