KnowledgeBase & Blog | Macromatic Industrial Controls

Understanding Time Delay Relay Functions

Thursday: October 17, 2019 : Time Delay Relays

Issue: What is the difference between On Delay, Off Delay, Single Shot, Interval On and all these other time delay functions? Solution/Resolution: 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, questions such as what initiates a time delay relay,

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What Is Phase Unbalance? How Can I Protect My Equipment?

Monday: October 14, 2019 : Three-Phase Monitor Relays

Phase unbalance of a three-phase system exists when one or more of the line-to-line voltages in a three-phase system are mismatched. Line-to-line voltages typically vary by a few volts, but a difference that exceeds 1% can damage motors and equipment. How Can I Protect My Equipment?

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What type of power systems can Macromatic relays protect?

Tuesday: October 1, 2019 : Three-Phase Monitor Relays

Macromatic devices work on many systems. Here are the guidelines and recommended connections for Open Delta, Corner Grounded and High Leg (Red Leg, Wild Leg) Delta systems. Contact Macromatic for technical information on other systems.

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What Is Undervoltage? How Can I Protect My Equipment?

Wednesday: September 25, 2019 : Three-Phase Monitor Relays

What Is Undervoltage? How Can I Protect My Equipment? Undervoltage occurs when the average voltage of a three-phase power system drops below intended levels, and is sometimes referred to as a brown-out. Operating in Undervoltage conditions can drastically reduce the life of the electromechanical equipment and lead to premature failure.

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What is a Phase Loss? How can I protect my equipment?

Tuesday: September 17, 2019 : Three-Phase Monitor Relays

When one phase of a three-phase system is lost, a phase loss occurs. This is also called 'single phasing'. What causes a phase loss? How can this condition be monitored and equipment failure and downtime be prevented?

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Barrier Relays vs. Zener Barriers in Intrinsically Safe Control Circuits

Tuesday: September 3, 2019 : Intrinsically Safe Barrier Relays

Intrinsically safe control circuits provide a safe and cost-effective method for interfacing electrical control devices that span across hazardous and non-hazardous locations. Safety is ensured at these interfaces using intrinsically safe barrier devices.

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What is Sequence On – Simultaneous Off Operation on Pump Control?

Tuesday: August 27, 2019 : Alternating Relays

Question: I want my two loads to come on one after the other, but then both loads to stay on together until the last control switch is opened.

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Three-Phase Monitor Relays: What Motor Do You Need to Protect?

Wednesday: August 21, 2019 : Three-Phase Monitor Relays

Macromatic Plug-In Three-Phase Monitor Relays provide protection for motors against premature failure caused by voltage faults. This series of relays retain fault indication and continue to monitor all voltages even with a lost phase.

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Circuit Design for Intrinsic Safety

Wednesday: August 14, 2019 : Intrinsically Safe Barrier Relays

When installing electrical equipment in or near hazardous locations, specific circuit design principles must be followed in order to prevent an explosion.

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Typical Applications for Alternating Relays

Tuesday: August 6, 2019 : Alternating Relays

Issue: How do I make connections to my Alternating Relay? Solution/Resolution: Macromatic offers several versions of Duplex Alternating Relays.  The following examples are typically the way connections are made to the relays.  The loads could be pumps, compressors, or air conditioning/refrigeration units.

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