The scenario
An impact crusher requires continuous rotor speed monitoring to protect the drive and ensure safe feeder operation. The feeder must only run when the crusher is on and speed is within limits.
What is in this drawing
Read the decisions behind it.
01
Seal-in circuit for crusher run command with feedback contact
02
Timer-based speed low detection to avoid nuisance trips
03
Feeder enable depends on both run status and speed OK, not just start
This pattern applies to any crusher, grinder, or conveyor interlock where downstream equipment must verify upstream process conditions before enabling.
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