Allmatic A1H-U Manual De Instrucciones página 17

Troubleshooting
Symptom
Green LED flashes
Green LED flashes, 2 fast
Detector remains in detect
after vehicle has left loop
Intermittent detection
No detection
A1H-U
6-1621238 rev.0 09/12/2013
All manuals and user guides at all-guides.com
Possible cause
Loop wire shorted or open
Loop was previously shorted
or open
1. Faulty loop
2. Poorly crimped terminals
3. Loose connections
1. Faulty loop
2. Poorly crimped terminals
3. Loose connections
4. Cross-talk between
adjacent loops
1. Loop wire shorted or open
2. Loop sensitivity set too low
Solution
Check loop resistance on the
appropriate loop pins on the control
board connector, between .5 ohms and 5
ohms.
Check loop resistance on the
appropriate loop pins on the control
board connector.
1. Perform megger test from loop lead
to ground, should be >100 megohms
2. Check loop connections to terminals
3. Check splices are properly soldered
and sealed against moisture
4. Observe display, level indicated on
display indicates residual frequency
shift from vacant loop to vehicle
presence, press Frequency Count
switch to re-initialize the detector
1. Perform megger test from loop lead
to ground, should be >100 megohms
2. Check loop connections to terminals
3. Check splices are properly soldered
and sealed against moisture
4. Set adjacent loops to different
frequencies (see Frequency Setting)
1. Check loop resistance on the
appropriate loop pins on the control
board connector, between .5 ohms
and 5 ohms.
2. With vehicle on loop, observe
display, set sensitivity to the level
indicated on the display
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