
1336-B003-ECD-F A-B Servo Controller
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IN STOCK1336-B003-ECD-F A-B Servo Controller
The MicroLogix power supply does not require or need a high inrush current. However, if the power source can supply a high inrush current, the MicroLogix power supply will accept it. There is a high level of inrush current when a large capacitor on the input of the MicroLogix is charged up quickly. If the power source cannot supply high inrush current, the only effect is that the MicroLogix input capacitor charges up more slowly. The following considerations determine whether the power source needs to supply a high inrush current: • power-up sequence of devices in system • power source sag if it cannot source inrush current • the effect of the voltage sag on other equipment If the power source cannot provide high inrush current when the entire system in an application is powered, the MicroLogix powers-up more slowly. If part of an application’s system is already powered and operating when the MicroLogix is powered, the source voltage may sag while the MicroLogix input capacitor is charging. A power source voltage sag can affect other equipment connected to the same power source. For example, a voltage sag may reset a computer connected to the same power source.
The power supply is designed to withstand brief power losses without affecting the operation of the system. The time the system is operational during power loss is called “program scan hold-up time after loss of power.” The duration of the power supply hold-up time depends on the type and state of the I/O, but is typically between 20 milliseconds and 3 seconds. When the duration of power loss reaches this limit, the power supply signals the processor that it can no longer provide adequate dc power to the system. This is referred to as a power supply shutdown.
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