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Powerware
®
9155 UPS (8–15 kVA) User’s Guide S 164201553 Rev D www.powerware.com
To switch to Normal mode from maintenance bypass:
1. If an optional isolation transformer is installed, switch the input
circuit breaker to the ON position.
NOTE The isolation transformer output is always 240V (180° phase
angle). Any equipment connected to the output requiring 208V (120° phase
angle) is at risk for damage.
2. Turn the Maintenance Bypass switch to the SERVICE position.
The UPS starts up in Bypass mode, with the load still powered
by utility power.
3. Remove the breaker tie from all battery circuit breakers.
4. Switch all battery circuit breakers to the ON position.
NOTE Wait until the indicator illuminates before proceeding to
Step 5; otherwise, power to the load may be lost.
5. Turn the Maintenance Bypass switch to the UPS position to
return to Normal mode. The UPS is now powering the load.
Internal Bypass Startup
To start up the UPS in Bypass mode without an MBM/PDM:
1. If an optional isolation transformer is installed, switch the input
circuit breaker to the ON position.
NOTE When using the optional isolation transformer, Bypass mode is
available only for 240V phase-phase (180° phase angle).
2. Switch on utility power where the UPS is connected.
3. Wait for the front panel LCD to illuminate.
The
indicator flashes.
4. Remove the breaker tie from all battery circuit breakers.