To the uninitiated, thyristor firing methods may seem like magical spells, but CD Automation has mastered them all, from zero crossing and phase angle to soft start with burst firing. The company offers tips to help process and maintenance engineers understand thyristor firing methods better.
The blog post explains the advantages and disadvantages of phase angle as a firing method and how to select the most efficient power control method for different types of operations. Among the tips offered are that large peak inrush currents, such as those that occur when you start a large industrial motor, can best be controlled phase-angle firing.
While phase-angle mode firing is continuous — a considerable advantage — it has disadvantages as well. CD Automation notes that phase angle firing generates harmonic disturbances and reduces power factor. The company offers advice on how to prevent such disturbances.