74 Eaton 9155 UPS (8–15 kVA) User’s Guide 164201553—Rev H0
Figure 52. Maintenance Bypass Switch
The UPS-mounted bypass switch has three positions as described in Table 11.
NOTE In the UPS or SERVICE position, AC input power is still connected to the input terminals
inside the UPS.
Table 11. 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.
Figure 53 shows a UPS with a separate battery cabinet and a UPS-mounted bypass switch.
UPS Operating Instructions
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