remote control failure

Failure to control relays. My radio control relay system has stopped working after 3 days. I am using a contact input board plus the I²C interface plus the particle photon and long range wireless module. The I²C board shows OK on power and bus, and is at 5.0 volts. Closing an input no longer activates the remotes, even a test unit in close proximity. The interface chip on the i/o board gets very hot to the touch with inputs closed. How can I best troubleshoot this?

 

R

Sounds like the interface chip is blown, tell us what you have connected?  For what it's worth, we recently had a user run 800 feet of cable to an input, this also caused a similar failure.  The IO on these boards is rated for a strict 0-5VDC, anything outside this range will damage the chip, and cause the overheating you describe.  We can help get you going again, but it will need to come to us for repair.  We need to find out what caused this in the first place so it does not happen again.

Thanks,

Ryan

G

Thanks Ryan,

The inputs are all connected to relay contacts that are just a few inches away. The relays are driven by 24 volt AC signals from an irrigation controller. There should be no external voltage on the board inputs, but I will verify that there was not some sort of malfunction.

Can I install a new interface board, or they all uniquely addressed making that more complicated procedure?

R

Just to be sure, can you provide me with part numbers you wish to interchange so I can validate?

Thanks,

Ryan

G

This is what I am using: MCP23017_I2CDIO16

Thanks

R

It won't be any problem to change out this board, just make sure the jumper settings are the same.

Thanks,

Ryan

G

Hi Ryan,

I installed the new i/o board, but the system still doesn't work. There is no internal voltage at the inputs, but the i2c and buss LEDs are lit. There is 5vdc on the buss. The i/o board would be configured by the photon on power up, right? I need to get this system operating ASAP. Thanks.