Motors and drives, the key components of any facility, are used everywhere and can be prone to a number of unseen problems.
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The electrical power issues that most frequently affect industrial plants include voltage sags and swells, harmonics, transients, and voltage and current unbalance.
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Most problems with single-phase motors involve the centrifugal switch, thermal switch, or capacitor(s). If the problem is in the centrifugal switch, thermal switch, or capacitor, the motor is usually serviced and repaired. However, if the motor is more than 10 years old and less than 1 HP, the motor is usually replaced. If the motor is less than 1/8 HP, it is almost always replaced.
With the push to energy independence and renewable energy sources, HVAC technicians need to know how to troubleshoot photovoltaic systems
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The electrical power issues that most frequently affect industrial plants include voltage sags and swells, harmonics, transients, and voltage and current unbalance. The proper tools to correct these issues include knowledge and electrical test instruments ideally suited for each task.
Current is the rate at which electrons flow past a point in a complete electrical circuit.
The need for true-RMS meters has grown as the possibility of non-sinusoidal waves in circuits has greatly increased in recent years. Some examples include variable speed motor drives, electronic ballasts, computers, HVAC, and solid-state environments.
Duty cycle is the ratio of time a load or circuit is ON compared to the time the load or circuit is OFF.