Controlled Products Systems Group MVPDTEK - Manual (Page 6)

Trouble Shooting
1. Perform megger test between loop lead and ground the
reading should be larger than 100 megaohms.
2. Check that loop is tightly connected to proper terminals
3. Check that splices are tightly soldered and sealed against
moisture.
4. Set adjacent loops on different frequencies. 1. Faulty loop
2. Poorly
crimped terminals
3. Loose
connections
4. Cross-talk
between adjacent
loop detectors Detector detects
intermittently even
when there is no
car on the loop.
1. Perform megger test between loop lead and ground the
reading should be larger than 100 megaohms.
2. Check that loop is tightly connected to proper terminals
3. Check that splices are tightly soldered and sealed against
moisture. 1. Faulty loop
2. Poorly
crimped terminals
3. Loose
connections Detector stays in
detect mode after
the car left the loop
and fails to
undetect.
1. Check loop resistance on pins 7 and 8 while driving over
the loop it should be less than 5 ohms and more than 0.5
ohms. The reading should be steady. Loop wire was
temporarily
shorted or
disconnected Green indicator
flashes with two
consecutive fast
blinks
1. Check loop resistance on pins 7 and 8 it should be less
than 5 ohms and more than 0.5 ohms. Loop wire shorted
or disconnected Green indicator
flashes
1. Check voltage on pins 1 and 2.
2. Replace internal fuse
3. Check wiring to detector No input voltage Green indicator is
not ON
Correction Possible Cause Symptom