It's Also Getting Late for Me Here, But Food For Though.
Maybe During Initial Setup, 3-Wire RTD Had a Loose Connection, Red Wire,
Pin-9, Maybe Intermediate Loose Connection Inside Crimp Connector,
TA4 Sensed a 2-Wire RTD Setup, Playing Around w/RTD Wiring Created
3rd (Red)Wire Connection, Now It's Really a 3-Wire Requiring Jumper.
Your Problem Might Happen Again, Possibly Due To The Crimp Connections,
Crimps Are Large Compared To RTD Thin/Small Gauge Wire Used.
If So, Solder Connections Up If Not Done, Watch Your Heat During Soldering.
Could Be Bad Connection Inside Cable On Sensor Side As Well.
Hopefully Not The TA4 Was a Intermediate Root Cause.
As Far As Meter Goes Set To OHMS, Meter Leads, 1 to White, Other to 1 Red
Should See a Ohm Value (2-Wire RTD) Leave Meter Lead Connected To White,
Connect To 2nd Red, Not Using 1st Red with It, Should See Ohm Reading,
Very Close, If Not Identical To 1st Reading (3-Wire RTD=Like 2 RTD's In 1)
So If It Happens Again, Your In a Bind, Revert Back To a 2-Wire RTD, &
Remove Jumper, 1 of The 2 Red Wires Hopefully Will Provide OHMs
Feedback To Your TA4.
That's My Story & Iam Stickin Too It
Glad Your Up & Running
Wow, thanks for the information. Now maybe you can explain this to me before I lose my mind...
I must admit I'm pretty much a novice when it comes to using the multimeter for anything other than volts, but I thought I'd try to follow your instructions. No luck, I wasn't getting any readings that made sense based on the information above (user error, no doubt). To add to my confusion, I have a 3-wire RTD (2 reds and 1 white), but did not have the jumper between 8&9 like PLC-Guy said was needed. Out of sheer curiosity - remember, this has worked for me for months, I promise - I tried making that jumper connection. Suddenly, it worked! And it was accurate! But...what?! How was it working previously? I don't remember making the jumper connection before; I don't think anything fell out randomly (it certainly wasn't in the control box); and the connections on 8 and 9 were still very tight. Was the magical beer fairy helping me out before? Or have I simply lost it...