adccommunitymod (AutomationDirect) asked a question.
Created Date: May 11,2019
Created By: HillKevin88
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Can anyone help? I am using a BRX processor with a BX-04THM module on an industrial furnace. I have ungrounded thermocouples with shielded extension wire. Shields are landed at the thermocouple only. All four channels are used. When each channel goes above 660F, that channel starts jumping between the correct temperature and -0.1. I have bonded the 0VDC with ground. The processor is a 24VDC model. The thermocouple extension wire runs in its own conduit. The closest it gets to 480VAC is about 5 feet. Inside my panel I only have 120VAC and 24VDC. Any thoughts?
Created Date: May 11,2019
Created by: HillKevin88
Can anyone help? I am using a BRX processor with a BX-04THM module on an industrial furnace. I have ungrounded thermocouples with shielded extension wire. Shields are landed at the thermocouple only. All four channels are used. When each channel goes above 660F, that channel starts jumping between the correct temperature and -0.1. I have bonded the 0VDC with ground. The processor is a 24VDC model. The thermocouple extension wire runs in its own conduit. The closest it gets to 480VAC is about 5 feet. Inside my panel I only have 120VAC and 24VDC. Any thoughts?
Created Date: May 11,2019
Created by: BobO
So it doesn't do it until it is above 660?
Created Date: May 11,2019
Created by: HillKevin88
That is correct. Each channel will do it independently as it reaches about 660F. I am using type K with the card configured as type K.
Created Date: May 11,2019
Created by: HillKevin88
I also tried turning off the combustion blower, the only 480VAC device, as well as all field 120VAC to see if it was noise from a field device. It still acted the same.
Created Date: May 11,2019
Created by: BobO
Might be best to get ADC tech involved.
Created Date: May 11,2019
Created by: HillKevin88
Are they open today?
Created Date: May 12,2019
Created by: HillKevin88
I switched the configuration from type K to mv and doing the scaling myself in logic. The readings are no longer jumping. The counts from the card are steady.
Created Date: May 16,2019
Created by: mls061
According to the manufacturer, this was a problem modules with revision B1 firmware, it was correct in version B2. You can contact the RMA department at ADC for a replacement module with the updated revision.