Ground loops are our main issue to fix with the usage for non-isolated analog outputs. Power supply voltage must always be at least as high as the worst-case sum of all of the voltage drops in the loop. Physical damage to the components Overload, poorly wiring and dimensioning the devices in the loop. Shared commons causing signal averaging Problems with shared, non-isolated commons will commonly average the processed signal causing the same value to be registered on devices that should be receiving different process variables. This is caused because bad scaling in the instrument. Variation in display signal the signal may also experience an addition or subtraction by some value from one point in the loop to another. This is likely a result of electrical noise or a ground loop. Unpredictable 4-20 mA signal fluctuations are a sign that something is interfering with your current loop. We have 3.5 mA that can be read as error signal. Remember Rheonics sensors provide 3 non-isolated analogs outputs, below we are going to describe what could happen with bad wiring, unproperly earthing and bring out possible solutions for these issues by adding 4-20mA isolators. Running so much wire could lead to problems with ground loops if independent loops are not properly isolated or there is a bad wiring connection.įigure 1. Multiple loops must be installed if we want to monitor all three (3) channels available. In the event that the loop does not appear to work properly, it is recommended that you first check the power and wiring. The problem can be caused by a poor selection of power, wiring or loop devices. Many factors can lead to a malfunctioning 4-20mA loop. Modified on: Tue, 22 Nov, 2022 at 2:55 PM Solution home Communication connections 4-20 mA What can go wrong with 4 - 20mA loops ?
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