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Transcript
Number of starts per hour The maximum number of starts/hour for a softstarter depends on several different factors such as the starting current, ambient temperature, starting time and the intermittens factor. Intemittens factor The intermittens factor is a figure indicating how long the softstarter has been running for (starting time and running time) compared with the total cycle time. Examples: If a softstarter has been running for 5 minutes of a total duty cycle of 10 minutes then the intermittens factor is 50 % ON time and 50 % OFF time. It is important to define the intermittens factor when talking about the number of starts/hour since the OFF time is the cooling time for the softstarter. If a softstarter has been running for 45 minutes of a duty cycle of 60 minutes then the intermittens factor is 75 % ON time and 25 % OFF time. A high starting current and a long starting time require a longer OFF time than a low starting current and short time to maintain the same number of starts/hour. 44 | Softstarter Handbook 1SFC132060M0201
