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Power Controls
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To download a specific
Power Control manual, please select from the drop down menu below. |
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Below
are commonly asked questions about the Power Controls we
represent. |
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How reliable is a SCR power controller?
Because they are solid state there are no moving parts to wear out or replace. Thus, they provide virtually limitless and trouble free operation.
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What is phase angle?
An SCR firing mode in which the SCR’s are turned ON for a portion of each half of the AC cycle.
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What is Zero-Cross firing?
A method of controlling load power in which SCR’s are turned ON only at the beginning of an AC cycle. Therefore, switching always occurs when the applied voltage is zero.
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Is soft start and missing cycle detection required?
These features are required in phase-angle control to assure that the load power is gradually increased from zero to the value set by the command signal if load power is interrupted. This gradual increase of power prevents surge current and avoids the possibility of saturating inductive loads like transformers.
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