I designed our own block detectors as an inexpensive alternative to purchasing remade modules.

PCB Build

(Still waiting for J4 screw terminals to arrive - this is what connects back to the CMRI node)

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• LED1 electrically does not have a polarity as it voltage is AC and swings positive and negative

Wiring

2 ea of 12 inch 18 ga wires

• Pad closest to diode get a fork terminal crimped at end
• Pad closest to PTC resistor gets a female connector for spade connection
• Single wire through current sense transformer is 1.5" 18ga

Timeline

22 Apr 2019 Boards shipped from pcbway today

24 Apr 2019 PCBs arrived and bench testing is complete

02 May 2019 1st 5 units are built and tested

09 May 2019 Starting second group of 5Install on the red wire side of the feeder.

20 Jul 2022 TODO: Add example of installed detector.

Demonstration

This video demonstrates overcorrect and over-current  and reset using a 2A high current short in parallel with a 200mA load across the track. Overcorrect Over-current LED comes on and resets with 200mA load on the track after the short is removed.

BOM

Single wire through current transformer is xx" long