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STD Irrigation Step-Down
Irrigation Step-Down
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Update time：
2024-06-14 01:56:00
Creation time：
2024-05-12 05:07:34
Description
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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Design Drawing
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| ID | Name | Designator | Footprint | Quantity | Manufacturer Part | Manufacturer | Supplier | JLCPCB Part Class | spiceSymbolName | Contributor | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | WJ128V-5.0-2P | P1,P2 | CONN-TH_2P-P5.00_WJ128V-5.0-2P | 2 | WJ128V-5.0-2P | KANGNEX(康奈克斯电气) | LCSC | C8269 | Extended Part | WJ128V-5.0-2P | |
| 2 | 10Ω | R1 | RES-TH_BD11.0-L49.5-P56.00-D1.0 | 1 | CR-L15W10Ω 5% P | CCO(千志电子) | LCSC | C216391 | Extended Part | CR-L15W10ΩJ | LCSC |
| 3 | 82Ω | R2 | RES-TH_BD8.0-L23.5-P27.50-D0.8 | 1 | EWWR0006J82R0T9 | RESI(开步睿思） | LCSC | C349004 | Extended Part | EWWR0006J82R0T9 | LCSC |
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