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3. Over-voltage protection circuit and over-current protection circuit
The +135 V main power line contains the over-voltage protection circuit and over-current protection
circuit that protect the power supply circuit and loads from getting damaged in the case of abnormal load
or failure in the voltage feedback systems.
If over-current flows in the +135 V main power line, the latch circuit consisting of Q611 and Q612 turns
on. If over-voltage appears in the +135 V main power line, the power supply to IC601 and IC602 is shut
down via an isolator PH602. Then the +135 V main power is stopped.
These protection circuits are reset by turning off the input power to the power supply circuit.
5-8
PVM-14L5/20L5/D14L5A/D20L5A
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