Reply to "Protocouplers will not open...only coupler sounds"

NortonOGR Forum Member

@ToledoEd posted:
One tested at 2.6 Ohms. Not sure I understand how to correctly "apply voltage." Should I disconnect the coupler leads from the PCB and just apply power across the coil? AC or DC? 18v AC? Thanks.

To apply power you do have to remove the connector from the board. I use non polarized capacitor leads in the connector but a resistor more than 100 ohms would work too. Then just touch the leads with power. 10-18 VAC is ok. You just have touch the lead momentarily. If you hear a hum and it doesn’t open then you have a mechanical problem. If it opens the problem is with the board.

Pete

7/30/2310:23 AM

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