140G-M-ECOPKY A-B  Interface Module

Isolation Transformers Consider using an isolation transformer in the AC line to the controller. This type of transformer provides isolation from your power distribution system to reduce the electrical noise that enters the controller and is often used as a step-down transformer to reduce line voltage. Any transformer that is used with the controller must have a sufficient power rating for its load. The power rating is expressed in voltamperes (VA).

Power Supply Inrush During power-up, the MicroLogix 1500 power supply allows a brief inrush current to charge internal capacitors. Many power lines and control transformers can supply inrush current for a brief time. If the power source cannot supply this inrush current, the source voltage could sag momentarily. The only effect of limited inrush current and voltage sag on the MicroLogix 1500 controller is that the power supply capacitors charge more slowly. However, consider the effect of a voltage sag on other equipment. For example, a deep voltage sag could reset a computer that is connected to the same power source. The following considerations determine whether the power source is required to supply high inrush current: • The power-up sequence of devices in a system • The amount of the power source voltage sag if the inrush current cannot be supplied • The effect of voltage sag on other equipment in the system If the entire system is powered-up simultaneously, a brief sag in the power source voltage typically does not affect any equipment.

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