Category Archives: Tech Tips

Consequences of Duplicate Addresses on a ModBus Plus Network

As with any addressable network, having duplicate addresses is an issue. On Modbus Plus networks, one of three things can occur. Modicon technical support disagrees on this subject but in my 30+ years of working with these networks all over … Continue reading

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Identifying ModBus Plus Connectors

Please click here to link to the complete video!

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Some of the Top Things That Cause VFD (drive) Failure

Inverters, drives, VSDs, variable speed drives, variable frequency drives – the category of products used to control an electric motor’s speed and thus reduce energy usage in a variable speed application has more names than Prince. Although, I suppose when … Continue reading

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Enroll Now for a Free “Introduction to PLCs” Seminar, Tuesday, December 9th.

Delta Automation will be hosting a free seminar titled “Introduction to PLCs” on Tuesday, December the 9th at 8:30 A.M. This seminar is targeted at those who desire some very basic knowledge of PLC technology and can be a “bridge” … Continue reading

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Enroll Now for a Free “Introduction to PLCs” Seminar, October 23rd.

Delta Automation will be hosting a free seminar titled “Introduction to PLCs” on October 23rd at 8:30 A.M. This seminar is targeted at those who desire some very basic knowledge of PLC technology and can be a “bridge” to a … Continue reading

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Heat Tracing short located with a TDR

One of Delta’s long time clients called with an unusual request inquiring if a TDR could be used to help locate a short circuit in a section of heat trace wiring.  This client has had Delta TDR its’ PLC communication … Continue reading

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How NOT to Bypass a VFD

During a recent client service visit to investigate a suspected VFD failure, our field engineers discovered a potentially deadly remedy that someone had put in place. Luckily no one was injured and no equipment was damaged. During our service visit, … Continue reading

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Cold Weather Mechanical Systems Tip!

Protect your HVAC coils from freeze-up by doing this simple check   It has been awhile since our area and many other parts of the country as well have been subjected to subfreezing weather extremes in the teens and single … Continue reading

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An Ageing Power Supply Finally Gives Up!

Power Supply Nearing 40 Years Old, Finally Fades Away  Recently a large industrial client had Delta investigate why its’ B266 reed relay output cards had been failing. Keep in mind these output cards are almost 40 years old. Over the … Continue reading

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Dual Cable ModBus Plus Network Phantom Errors

ModBus Plus Dual Cable Phantom Errors The advantages of utilizing the dual cable capability of the Modicon Modbus Plus system are to increase and maintain system uptime and availability. The dual-redundant nature of the system is virtually invisible to the … Continue reading

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