Page 21PROTECTOR® IV Top of Rail Installation, Operation & Maintenance Manual
Digital Control Box
The DCB is the primary component of the electrical system. Troubleshooting will start at the component level.
Symptom Possible Causes Possible Solutions
DCB has no readout in the LCD
display and at same time LED is
V"#4$/1&13**/
Battery voltage is too low Charge battery
Defective battery Replace battery
Defective DCB Replace DCB
Train wheels are not being
counted by DCB (pass a steel
object over sensor to test, LED on
m-!.26;&V"#4&(*66.5R
Sensor is defective Replace sensor
Sensor wiring at DCB connection
is incorrect or broken
Verify wiring connections
according to wiring diagram and
replace if necessary
Train wheels are only counted
sporadically by DCB
Sensor height is incorrect Adjust sensor height using shims
Rail has become magnetized Relocate sensor
Sensor or bracket has become
loose
Tighten bolts
Loose cable connection Push connectors in fully, place
yellow housing over connection
LCD does not turn green when
U/7US&$#&<3*##*;
Defective DCB Replace DCB
Battery voltage is too low Charge battery
Defective Battery Replace battery
Control buttons do not change
readings in LCD display
Defective DCB Replace DCB
No readout
Temperature is below -20°C Read display once temperature is
above -20°C
Defective DCB Replace DCB
Unclear LCD
High level of electrical noise Verify grounding of cabinet
Defective DCB Replace DCB
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