4-20mA signal is not reading in CBF for Multivariable transmitter
We have to integrate Cameron's NUFlo Scanner 2000 Multivariable transmitter(MVT) in our AC800F-R RTU. Here we are using AI895 card with TU890 base plate. The MVT is a 4-wired transmitter which powers up from external 24 V DC-Distribution Box. To block the 24V from our AI895 card we have used external zener diode - 1N5359 (by Motorola) in reverse bias.
Now comes the problem- We are receiving 4-20 mA signal from the instrument till the AI895 card base plate but the CBF is showing value 0 only i.e it is not reading the device's mA . When checked in the Hardware Structure DTM- error pops up that - "Connect to HART device failed :Instrument not found"
Just to mention that no additional HART DTM for specific device is installed , just Generic HART DTM is installed. Is this the problem ?
What could be the reason and if i can get any solution to work with it ? It will be very helpful if you give me some of your inputs.
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