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5. OCP (OVER CURRENT PROTECTION) CIRCUIT
This circuit is designed to protect the circuit from over current due to overload occurred at the rear of 123[V] line
1) CONFIGURATION OF OCP CIRCUIT
2) EXPLANATION OF THE OPERATION
There is very little voltage drop at
R423 of 123[V] line.
In case that the overload occurs at the rear of 123[V] line, the increase of the voltage drop at R423 bring down the base
voltage of the Q407 os as to drive the Q407
Because of the overload at the rear of the R423, the voltage of the
point decreases. And this makes Q407 turn on
so that a voltage is applied to the #31 of l701.
In case that OCP operates by the #31 of the l1701, the set is protected by power off (#42 of l1701
LOW).
Summary of Contents for DTQ-14Q1FS
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