[Dsg-halla_magnets] Cleo Temp sensors

[Brian Eng]

Probing with a DMM showed that some of the inputs to the dataforth were floating to low triple digit mV (+ and -), hence being out of range for the PLC after conversion on the dataforth.

Ch 0 and 1 are now in the single digits after measuring them with the DMM.

I suspect if you either ground or try to measure any of the other remaining channels that are reading "bad" they'll start to read more reasonable values.

I didn't get a chance to probe any upstream of the dataforth since it seems like the test lab lights automatically turn off ~2000.

I did find one signal return wire that was off by one channel on the dataforth breakout board #3, but that has since been fixed.

> On Aug 11, 2022, at 12:57 PM, Brian Eng <beng at jlab.org> wrote:
> 
> At least the wiring diagrams for this module and dataforth seem okay.
> 
> While most are reporting an undervoltage condition, some are reporting an overvoltage. Seems like could be a ground issue; maybe the ribbon cable between the dataforth backplane and breakout is somehow flipped?
> 
> I'll come check with a DMM later this afternoon.
> 
> From: Dsg-halla_magnets <dsg-halla_magnets-bounces at jlab.org> on behalf of Steven Lassiter <lassiter at jlab.org>
> Sent: Thursday, August 11, 2022 9:19 AM
> To: dsg-halla_magnets at jlab.org <dsg-halla_magnets at jlab.org>
> Subject: [Dsg-halla_magnets] Cleo Temp sensors
>  
> Hi,ck 
> 
>  General question:
> 
> The CLEO magnet and service neck temperature sensors are not connected to the I/O rack yet but the wiring within the rack is completed.
> 
> Therefore if no signal is going to the Dataforth signal conditioners then their output should be near 0 Volts output going to the 1756-IF16 modules. The PLC should be reading a signal near 0 Volts for these temperature sensors but for the most part the PLC is reporting input errors (input is underrange < -10.25V) .
> 
> Only sensor is reporting a reasonable input reading near zero, AST2 -LN2 for the shield.
> 
> The 1756-IF16 are acting as if no signal is coming in and their inputs are floating.
> 
> Ideas or thoughts on this?
> 
> Steven
> 
> 
> <image.png>
> 
> <image.png>
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