KNOWLEDGE BASE ARTICLES

Macromatic Product and Technical Articles

Have technical questions? Our Knowledge Base Article (KBA) collection has hundreds of technical reports to help you select the best Macromatic products to meet your requirements. KBAs include helpful instructions if you are not sure how to set up our devices for your application. Many of the articles can help you better understand Macromatic terms and industry vernacular.

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Macromatic Knowledge Base Articles

Rapid Cycling of Control Switch Damages Large Pumps or Compressor Motors

Issue: How do I prevent a Bouncing Control Switch Due to Splashing Water from Rapidly Energizing One Load and Then the Other?   Solution/Resolution:  In Figure A, a single Control Switch could be susceptible to splashing water which would cause rapid opening & closing of the Control Switch.  Each time this

Macromatic Knowledge Base Articles

Interactive Competitive Cross-Reference

Did you know . . .

Macromatic Knowledge Base Articles

Troubleshooting for a Phase Reversal (Phase Sequence) Problem

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

Macromatic Knowledge Base Articles

Undervoltage Settings on Universal Voltage Three Phase Monitor Relays

Issue: Your new PMPU three-phase monitor relay can work on any voltage between 190 & 500V. It also includes an adjustable under-voltage 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? Solution/Resolution: On the

Macromatic Knowledge Base Articles

Maximum Voltage Ratings of Phase Monitor Relays

Issue: What is the maximum voltage that your phase monitors can handle? What about the units that offer overvoltage protection? Solution/Resolution: Use the table below to determine the maximum continuous voltage rating of all Macromatic Three-Phase Monitor Relays. Voltages in excess of these values could cause damage or improper operation:

Macromatic Knowledge Base Articles

Phase Monitor Relays & Different Frequencies

Issue: Do your Phase Monitor Relays work at both 60hz as well as 50hz? What is the tolerance at either value? Solution/Resolution: All Macromatic plug-in Three-Phase Monitor Relays manufactured after April 2014 & all PMD Series surface-mount Three-Phase Monitor Relays work on both 60 & 50Hz applications with a tolerance

Macromatic Knowledge Base Articles

Undervoltage Settings on Universal Voltage Three Phase Monitor Relays

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? Solution/Resolution: On the

Macromatic Knowledge Base Articles

What is True RMS? And Why is it Important in a Phase Monitor?

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

Macromatic Knowledge Base Articles

TAA2U and TAD1U Start, Inhibit and Reset Inputs

The Macromatic TAA2U and TAD1U offer a wide variety of functionality and application versatility by offering START, INHIBIT and RESET inputs. The information below explains the functionality of these 3 circuits. TAA2U TAD1U START INPUT TAA2U TERMINAL 6 AND TAD1U TERMINAL 3 The START circuit initiates the timing function when connected. There are 2

Macromatic Knowledge Base Articles

Protection on a Corner Grounded Delta System

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

Macromatic Knowledge Base Articles

New 575V AC Three-Phase Monitor Relays

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

Macromatic Knowledge Base Articles

Macromatic’s Time Delay Relay Function Guide

Important questions to ask. Understanding the differences between all the functions available in time delay relays can sometimes be a daunting task. When designing circuits using time delay relays, several questions must be asked. WHAT IS THE DIFFERENCE BETWEEN A CONTROL RELAY & A TIME DELAY RELAY? Time delay relays