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6.3.2 Installation/replacement of power modules with the UPS in maintenance bypass mode
If the hot-swap procedure explained in the previous paragraph is not applicable, it is possible to replace or even to add
PM with the UPS in maintenance bypass mode.
INDICATION
During this procedure, the load is not protected by the UPS because it is powered from the bypass input line.
6.3.2.1 Setting the UPS in maintenance bypass mode
1. Tap on the Setting icon of the menu bar at the bottom of the display
2. Check on the tab “System” that the item “Bypass Enable” is set to YES. If not, tap on the item and enable the bypass.
3. Tap on the item “Bypass Forced Mode” and set it to YES. The LEDs of the PM blink fast in orange.
4. Close the maintenance manual bypass switch by bringing it to the ON position. The load is powered directly from the
bypass line.
5. Shutdown the UPS by following the procedure described at paragraph 5.3.
6. If present, open the battery disconnectors of the external battery cabinets.
DANGER
If there are battery drawers installed in the cabinet, some internal parts of the UPS are still live with dangerous voltage.
Remove at least one battery drawer for every shelf present to interrupt the battery string.
6.3.2.2 Installation/replacement of power modules
Check that the procedure for setting the maintenance bypass mode described in paragraph 6.3.2.1 has been applied.
To replace a PM:
1. Open the frontal switch of the PM to be replaced.
2. Unscrew the fixing screws of the PM and save them.
6. Maintenance
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