Powerware 9155 Using the Wall-MountedBypass Switch, Maintenance Bypass switch, Table 15. Wall-MountedBypass Switch Positions

UPS Maintenance

Using the Wall-Mounted Bypass Switch

The wall-mounted bypass switch is rated at 80A/300 Vac and has four positions as described in Table 15.

NOTE In the UPS or LINE position, AC input power is still connected to the input terminals inside the UPS.

Table 15. Wall-Mounted Bypass Switch Positions

Switch Position		Description
UPS	Connects the UPS output to the load.
LINE	Connects the load directly to AC input power and disconnects UPS output. AC input
	power is still connected to the UPS input.
SERVICE	Like the LINE position, SERVICE connects the load directly to AC input power and
	disconnects UPS output. However, because SERVICE also disconnects AC input
	from the UPS, this is the appropriate position for UPS maintenance or repair.
OFF	Disconnects the load from the UPS output power and AC input power, as well as AC
	input power to the UPS input.
	You must press the red button beside the switch before turning the
	Maintenance Bypass switch.

Figure 43. Wall-Mounted Maintenance Bypass Switch

82 Powerware® 9155 UPS (8–15 kVA) User’s Guide S 164201553 Rev D www.powerware.com