E2812

The E2812 and E2824 controller shelves use wide-ranging, redundant power supplies that automatically accommodate voltages to the AC power source. The power supplies meet standard voltage requirements for both North American (USA and Canada) operation and worldwide (except USA and Canada) operation. The power supplies use standard industrial wiring with line-to-neutral or line-to-line power connections.

Keep this information in mind when you prepare the installation site for the controller shelf:

• Protective ground – Site wiring must include a protective ground connection to the AC power source.

  Note: Protective ground is also known as safety ground or chassis ground.

• Circuit overloading – Power circuits and associated circuit breakers must provide enough power and overload protection. To prevent damage to the controller shelf, isolate its power source from large switching loads, such as air-conditioning motors, elevator motors, and factory loads.
• Power interruptions – The controller shelf can withstand these applied voltage interruptions:
  • Input transient – 50 percent of the nominal voltage
  • Duration – One half-cycle
  • Frequency – Once every 10 seconds
• Power failures – If a total power failure occurs, the controller shelf automatically performs a power-on recovery sequence without operator intervention.

Power factor correction is applied within the power supply, which maintains the power factor of the E2812 and E2824 controller shelves at greater than 0.95 with nominal input voltage.

The E2812 and E2824 controller shelves are each shipped with two AC power cords, which use the standard AC outlets in the destination country. Each AC power cord connects one of the power supplies in the controller shelf to an independent, external AC power source, such as a wall receptacle, or to any uninterrupted power supply (UPS).

If you have a cabinet with internal power cabling, such as a ladder cord, you do not need the AC power cords that are shipped with the controller shelf.