Install the Power Supply Unit

About this task

The controller ships with one power supply unit. You can replace the existing power supply unit if needed or add a second unit as a backup.

Note

The controller requires one power supply to operate normally. Remove and replace only one power supply at a time in a system that is powered On.

With two power supply units installed, the power load is distributed across both power supplies to maximize efficiency. When you remove one unit with the system powered On, then the remaining power supply unit picks up the power load.

The power supply unit and the redundant unit are at the rear of the controller. From left to right: 1. AC power supply unit; 2.Handle. 3. Redundant power supply unit.

Table 1. Power supply unit hardware
Callout	Description
1	AC power supply unit
2	Handle
3	Redundant power supply unit. The part number for the redundant power supply unit is PSI-1300W-APL. The power supply unit plate helps to cool the controller when a redundant power supply is not installed.

Procedure

Perform of the following tasks depending upon if you are installing a redundant power supply unit or replacing the existing unit:
- Install a redundant supply unit: Remove the redundant power supply plate.
  Grasp the center hole and pull the plate out.
- Replace the main power supply unit: Shut-down the controller or install a redundant supply and then remove the main power supply unit.
Line up the new power supply unit with the opening on the controller.
The power supply unit aligns with the connector end closest to the controller bottom and front.
Insert the unit in the opening until it locks into place.
The unit slides easily into the opening but there is some resistance about the last 1/2 inch.
Connect a power source to the controller.
The power supply unit LED should be green. For more information, see Power Supply Unit LED.