Operation
5.Switch all battery circuit breakers to the ON position. The 
indicator stops flashing.
6.Press any button on the front panel display to activate the menu options.
7.Using the 
button on the front panel display, scroll to the Control menu option and press the 
button.
8.Press the 
button to select the Go to Bypass Mode option.
The 
and 
indicators illuminate, indicating the UPS is operating in Bypass mode. The load is now powered by utility power.
To switch to Normal mode from internal Bypass mode:
1.Press the 
button to select the Go To Normal Mode option.
2.Press the ESC button until the Eaton Powerware logo appears.
Normal Mode Startup
To start up the UPS:
1.If you have an optional MBM/PDM, verify that the Maintenance Bypass switch is in the UPS position (see Figure 41 on page 79).
2.If an optional isolation transformer is installed, switch the input circuit breaker to the ON position.
3.Switch on utility power where the UPS is connected.
4.Wait for the front panel LCD to illuminate. The 
indicator flashes.
5.Remove the breaker tie from all battery circuit breakers.
6.Switch all battery circuit breakers to the ON position. The 
indicator stops flashing.
72 | Powerware® 9155 UPS |