E3Electronic说明书解释.ppt

* Like stall, when a jam condition occurs, the motor’s current draw increases towards its locked rotor current rating which can lead to motor overheating and equipment damage. * The jam settings available with the E3 overload relay include: An inhibit time adjustable from 0 to 250 seconds. A trip delay setting that is adjustable from 0.1 to 25.0 seconds. Trip and warning levels that are adjustable from 50 to 600% FLA. The graph illustrates that the Inhibit Time setting allows the E3 to ignore the high inrush current seen during the motor starting sequence. Once the inhibit time period has expired, jam protection is enabled and, as soon as the current exceeds the trip level, the trip delay timer begins to count down. If the motor current is still beyond the trip threshold after the trip timer has expired, a jam trip will occur. Typically, the warning level would be set at a value below the trip level. There is no delay function with warnings. * (Slide text is sufficient) * The underload settings available with the E3 overload relay include: An inhibit time adjustable from 0 to 250 seconds. A trip delay setting that is adjustable from 0.1 to 25.0 seconds. Trip and warning levels that are adjustable from 50 to 100% FLA. The graph illustrates that the Inhibit Time setting allows the E3 to ignore the motor starting sequence (applicable to adjustable frequency drive installations). Once the inhibit time period has expired, underload protection is enabled and, as soon as the current drops below the trip level, the trip delay timer begins to count down. If the motor current is still below the trip threshold after the trip timer has expired, an underload trip will occur. Typically, the warning level would be set at a value above the trip level. There is no delay function with warnings. * (Slide text is sufficient) * (Slide text is sufficient) * (Slide text is sufficient.) * The E3’s built-in DeviceNet connection port simplifies and cost reduces the exercise of putt