Category Archives: On-site stories

How often should Remote I/O & Modbus Plus networks be certified?

We recently had a client with many, many Modicon remote I/O and Modbus plus networks installed and in use in their plant, pose this question. The short answer is usually every one to two years or if they are having … Continue reading

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Quantum Remote I/O Metallic Cable System

This is the TDR trace that shows the original cable system on a recent project that Delta Automation, Inc. was tasked with repairing. This system shows many issues: excessive dB losses, poor splices, poor connections and terminations. This is the … Continue reading

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Fiber Modems with Modicon Remote I/O HSBY systems

“Third party fiber modems aren’t compatible with Modicon HSBY systems….” Continue reading

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Unknown Cable Splice Causes Issues

A prison facility was having intermittent issues with the locking and unlocking of cells and passageways in one of its’ inmate housing facilities. This is not a good thing to have occurred in a facility such as this! After extensive … Continue reading

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Variable Frequency Drives Preventive Maintenance: Statistics Tell the Story

Since designing and implementing a formal preventive maintenance (PM) program for variable frequency drives (VFDs) just under two years ago, Delta Automation has developed some interesting statistics related to the operational condition of VFDs. The generally accepted practice for most … Continue reading

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Proper phasing of a VFD with bypass

A local college contacted Delta Automation with a request for on-site service to repair a VFD on the hot water pump for their heating system. This heating system was for the gym where a basketball game was scheduled for later … Continue reading

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