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Dc volatge ground isolator11/9/2023 ![]() ![]() However, we have seen cases where, for whatever reason, there is resistance in the path to local ground. ![]() Ideally, these ground stakes are supposed to be no resistance on that ground wire and no voltage drop. Each breaker panel can have its own local ground stakes. The computer is probably plugged into a standard 110VAC out but the manufacturing machine may require 220 or 480VAC so it is fed from a different breaker panel than the PC. Now if the computer is plugged into an outlet in one area of the building and an RS232 device it is connected to is in a different area of the building it can create a multi-path connection and a ground loop.Īnother example is a computer controlling a piece of manufacturing equipment. Ethernet cables are pretty good at maintaining ground isolation but serial communications cables, RS232 for example, have their own ground conductor. These devices may also be connected to each other by data communications cables. ![]() In a worst-case scenario, this could cause an interruption in operations since many businesses heavily rely on PLCs and measurement systems for process and machine control, quality control, final test, etc.–yet ground loops often escape troubleshooting investigations and are equally neglected as a factor in many installations, arising later when electrical configuration or environmental conditions change.Ĭomputers, data loggers, and data acquisition/control systems are normally connected to the ground through their AC power supply and the ground pin on the plug that goes into the wall outlet that shares the ground wire in common building wiring. Engineers and technicians collecting data often find that their readings and data show offsets that may change over time or noise in the measured values. In video applications, users will notice this feedback in the form of onscreen stripes, while computer and networking users can experience shutdowns or gaps in their data communication. Whether using different safety grounds or a safety ground and an earth ground, one of the most common examples is buzzing/humming sounds caused by currents induced in ground loops from mains (60 Hz) AC power. The net effect is that while it is believed that the devices have the same ground reference point in fact they don’t and this difference can appear as a simple offset in measured values or as signal noise that corrupts the devices’ normal operation. Or, the ground points of the different Idevices may not be at the same potential voltage due to current and resistance in the ground path. Electrical and magnetic fields which flow through the loop can generate unintended currents and voltages. Together, the separate paths form a loop. Ground loop feedback is a frequently encountered wiring issue arising when two or more connected electrical devices have more than one path to earth ground. The Application Specialists at CAS DataLoggers have put together this brief introduction on the subject. ![]() Furthermore, this can also be a seasonal issue where problems come and go based on climatic conditions. One of the most common problems is known as ground loop feedback–an electrical phenomenon often resulting when different electrical circuits within a system and its peripherals have different connections or paths back to earth ground. However, it’s less well known that while grounding can prevent and resolve many safety and power issues, improper grounding can create problems in data logging, data acquisition, and measurement and control systems. Most workers already know that proper grounding is a fundamental safety precaution for all kinds of electrical equipment. ![]()
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