There are displays on site; what to do if the DCS is not available?
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The mass flow meter of LZYN Yino is showing normal flow rates in the field, but no flow rate is indicated on the DCS display; there should be no issues with the wiring. It operates on a four-wire system with 24V power supply and is connected to a safety barrier. I’d like to ask what needs to be set for the flow meter; I’ve already set all the basic options. Gentlemen, what do you think???? I’m humbly seeking your advice????
This post was last edited by Happy Lumberjack on 2020-11-24 at 08:46. Although you said that there’s no problem with the wiring, it’s still recommended that you check the wiring starting from the meter head. Please follow these steps to troubleshoot: 1. Check whether there is any signal output from the output terminals of the meter head； 2. Can a signal be detected at the terminal inside the panel cabinet? ； 3. Is there a signal at the safety gate input? ； 4. Is the wiring of the safety gate to the DCS channel correct? Some safety gates output two-wire signals, while others output four-wire signals ； 5. Is the DCS configuration correct?
Check for any ERR alerts; generally, ERR indicates a disconnected connection
Check where the flow meter signal cable is connected to the safety barrier; if a 24V supply is provided via a four-wire system, then no power needs to be supplied to the safety barrier, and a passive connection method should be used. Disconnect the cables on the cabinet side, and use a multimeter to directly measure the signal of the cables at the installation site (no need for a safety barrier); check whether there is a current signal. If one is present, it indicates that there are no issues at the installation site. Then, examine the wiring of the safety barrier and carry out the configuration ； If not, check the wiring and output board of the flow meter.
Are you sure you are receiving a 4-20MA signal? Is it still a pulse signal? There are two connection methods for the on-site meter of Yino’s flowmeter
The signal’s DC voltage is too high, and it has been blocked by the safety barrier.
You haven’t been very specific; I can only try it step by step. First: Check the alignment lines to make sure there are no issues with them. Second: Powered by a power supply; the signal lines are connected to the safety barrier. Is the safety barrier connected to a passive point? Third: Is the range set correctly? Or should the output be set as quality or volume? Fourth: Measure the current level in front of and behind the field signal cable and the safety barrier to determine whether there is any current flow It’s either too big or too small. Fifth: Change the channel and connect the signal cable to another safety barrier.
1. Check the input current before the safety barrier to see if there is a 4-20mA input; if not, check the cable, the output of the gauge, and the settings for the gauge’s output； 2. Check the safety barrier, configure the safety barrier ； 3. Is the DCS configuration correct? ；