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| ats:start [2024/05/29 23:38] – [Relay Logic ATS] Alan Shea | ats:start [2024/08/27 13:12] (current) – [Motor Contactor Selection] Alan Shea | ||
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| A secondary disadvantage of a packaged ATS is that the contacts are typically listed for a maximum of 5000 transfers at rated load, at which point the contacts must be replaced, and frequently the electro-mechanical actuator as well. In locations where electric power is reliable, this is typically not an issue as 5000 transfers will take several decades to accumulate. In locations with unreliable power this number of transfers can be accumulated in just two or three years. | A secondary disadvantage of a packaged ATS is that the contacts are typically listed for a maximum of 5000 transfers at rated load, at which point the contacts must be replaced, and frequently the electro-mechanical actuator as well. In locations where electric power is reliable, this is typically not an issue as 5000 transfers will take several decades to accumulate. In locations with unreliable power this number of transfers can be accumulated in just two or three years. | ||
| - | ====Contactor-Based ATS=== | + | ====Contactor-Based ATS :: Pro & Con=== |
| Automatic transfer switches for standby generators using industrial motor-control contactors have the advantage of simplicity and long-life, typically over 500,000 operations at rated load in the 400A range, increasing in smaller Ampere size ratings. They also use typical off-the-shelf components that are commonly available. | Automatic transfer switches for standby generators using industrial motor-control contactors have the advantage of simplicity and long-life, typically over 500,000 operations at rated load in the 400A range, increasing in smaller Ampere size ratings. They also use typical off-the-shelf components that are commonly available. | ||
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| ====Motor Contactor Selection== | ====Motor Contactor Selection== | ||
| - | The appropriate size of motor contactors should be selected based on the load served and the genset size. The 400A frame is a good general purpose selection, but smaller or larger can substituted, | + | The appropriate size of motor contactors should be selected based on the load served and the genset size. The 400A frame is a good general purpose selection, but smaller or larger can substituted, |
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ats/start.1717025895.txt.gz · Last modified: 2024/05/29 23:38 by Alan Shea
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