Powerware 9155 Using the UPS-MountedMaintenance Bypass Switch, Table, Table 14. UPS-MountedBypass Switch Positions

UPS Maintenance

Using the UPS-Mounted Maintenance Bypass Switch

The UPS-mounted Maintenance Bypass switch is part of the optional Maintenance Bypass Module or Power Distribution Module and is located on the back of the UPS (see Figure 41).

Figure 41. Maintenance Bypass Switch (PDM Shown)

		The UPS-mounted bypass switch has three positions as described in
		Table 14.
		NOTE In the UPS or SERVICE position, AC input power is still
		connected to the input terminals inside the UPS.
Table 14. UPS-Mounted Bypass Switch Positions
Switch Position		Description
UPS	Connects the UPS output to the load.
SERVICE	Connects the load directly to AC input power and disconnects UPS output. AC input
	power is still connected to the UPS input.
BYPASS	Like the SERVICE position, BYPASS connects the load directly to AC input power and
	disconnects UPS output. However, because BYPASS also disconnects AC input
	from the UPS, this is the appropriate position for UPS maintenance or repair.
Powerware® 9155 UPS (8–15 kVA) User’s Guide S 164201553 Rev D www.powerware.com			79