How to select a DIN rail power supply


Published on Selecting a DIN Rail mounted Power Supply can be tough. In this presentation,you will find suggestions on what to look for when selecting a power supply for your application.

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How to select a DIN rail power supply

  1. 1. What to Look for When Choosing a Power Supply 877-650-5160 Automation Systems Interconnect Safety, reliability, and power factor correction are among the prime considerations 1
  2. 2. One of the most fundamental and often overlooked purposes of a power supply is to provide isolation and therefore safety from a high-voltage (or dangerous) supply line Safety First 877-650-5160 2
  3. 3. Reliability Q: What Affects the Reliability of a Power Supply? A: - Average load rate - Vibration - Ambient Temperature 877-650-5160 3
  4. 4. Key issue is the amount of heat generated by the internal components ASI Power Supply Designed with Excellent Ventilation to Avoid Overheating 877-650-5160 4
  5. 5. Mean Time Between Failure (MTBF) some manufacturers have developed their own proprietary calculations for MTBF that produce higher values, it is best to compare only using the MTBF as defined in MIL-HDBK-217E 877-650-5160 5
  6. 6. key performance element of a power supply is its power factor Power Factor Correction 877-650-5160 6
  7. 7. Power Factor Correction There are two primary methods of power factor correction (PFC). The first method is the use of a simple coil at the input, and the second involves the use of a special electronic power-factor-correction circuit. The use of the coil is referred to as "passive" PFC and it typically produces a power factor of 0.7 to 0.8. The best use of the available energy with the least amount of conducted harmonics can be achieved with "active" PFC. 877-650-5160 7
  8. 8. Power Factor Correction “Active” PFC Active PFC can produce a power factor greater than 95% and is most useful in larger power supplies, 24 Vdc at 10 A and higher, since the conducted harmonics are directly proportional to the current load. 877-650-5160 8
  9. 9. Power Factor Correction Look for the power supply to also meet the EN 55011-B and EN55022-B specification for electrical emissions and EN 61000.3.2 regarding harmonic emissions conducted back on the main input lines. 877-650-5160 9
  10. 10. Surge Protection This built-in feature (up to 4 kV of protection) saves valuable panel space by not requiring an external suppressor 877-650-5160 10
  11. 11. A good power supply is one that offers a minimum of 5%, and ideally 10% of overload protection . 877-650-5160 11
  12. 12. Short-circuit protection: - For Safety Purposes - Saves time in powering up after a short circuit has been detected 877-650-5160 12
  13. 13. Agency Approvals UL, CSA, and CE compliance marks are evidence of passing several safety and electrical emissions requirements 877-650-5160 13
  14. 14. Agency Approvals The UL 508 listing offers the additional benefit of not requiring a power supply rated for twice the intended use. Without UL 508, the power supply must be derated by 50% in order for the control cabinet to also be UL 508 compliant. 877-650-5160 14
  15. 15. Contact ASI For More Power Supply Information: 877-650-5160 877-650-5160 15