Three-Phase Monitor Relays

Issue: Are there any issues with using a three-phase monitor relay on a system that is using a phase converter to get a third leg on a 240V system? Solution/Resolution: There are two important items to watch out for in this application. STATIC phase converters are not truly providing 3 phase power and are not

Macromatic announces an exciting addition to its plug-in series of Three-Phase Monitor Relays. To provide solutions for a greater variety of voltage applications, four new 575V AC Three-Phase Monitor Relays are now available that monitor a voltage range of 460 to 600V AC. This new voltage option is available in the following part numbers: Product Number Protects

Issue: Can I use a phase monitor for protection on a corner grounded delta system? Answer: Yes, Macromatic phase monitor relays provide the same reliable protection on corner grounded delta systems. A corner grounded delta system is a common way to establish a reference to safety ground when dealing with an otherwise floating output from a 

RMS stands for Root Mean Square. True RMS is a mathematical formula that is used to calculate the effective value of an AC wave shape. To understand why this is important, it is helpful to first discuss what a phase monitor does. A phase monitor measures voltage to confirm the presence of a desired voltage; it 

Issue: Your new PMPU three-phase monitor relay can work on any voltage between 190 & 500V. It also includes an adjustable undervoltage trip setting of 80-95% and a fixed overvoltage trip setting of 110%. How do these percentages work depending on where you set the line-line voltage?

Issue: Do your Phase Monitor Relays work at both 60hz as well as 50hz? What is the tolerance at either value?

Issue: What is the maximum voltage that your phase monitors can handle? What about the units that offer overvoltage protection? 

Issue: I have purchased one of your three phase monitor relays and have connected it per the diagram on the unit. However, I cannot get the unit to operate–it just won't turn on. What's wrong? Solution/Resolution: Most problems when first installing and applying a three-phase monitor relay are due to phase sequence issues. Although you