Industrial Automation, PLC, VFD, and Troubleshooting
Introduction
When a Variable Frequency Drive is controlled from external pushbuttons, selector switches, relays, or PLC outputs, the technician must understand the difference between 2-wire control and 3-wire control.
These two control …
Read MoreIntroduction
One of the most common problems when troubleshooting a Variable Frequency Drive is not electrical power, not the motor, and not even a bad drive.
Many times the real issue is …
Read MoreHow PLCs Connect to the Real World
A PLC does not control a machine by itself. It needs a way to receive signals from field devices and send commands back to …
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