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Irrigation Step-Down

STDIrrigation Step-Down

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Creation time:2024-05-12 05:07:34Update time:2024-06-14 01:56:00

Description

Step down AC voltage from +27V to +24V.  Line smoother to prevent ringing with AC Pump Start Relay.

 

A common issue with irrigation pump start relays being located too close to the controller which introduces EMI noise during initial 60A in-rush current that causes relays to quickly latch and unlatch.  This should hopefully solve the issue by dropping the 27VAC+ source to 24VAC nominal with a voltage divider and smooth any AC line ringing with a heavy duty shunt resistor.

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