Powerware 9150 - Page 49

Operation
45
Powerware
®
9150 User’s Guide : www.powerware.com
WARNING
:
Ifthe inputfrequencyisnot correctand the UPS is notsynchronizedto utility
power(LINEONindicatorisoff),theuseofthe MaintenanceBypassswitchcauses
a breakinthe output voltage.Wait until theLINE ON indicator illuminates before
using theswitch.
:
Donotusethe MaintenanceBypassswitchiftheUPSisconfigured asafrequency
converter (50 Hz in/60 Hz out or60 Hzin/50 Hzout);itcould cause damage tothe
load.
To operate the Maintenance Bypass switch:
1. Check to ensure the LINE ON indicator is on.
2. Turn the Maintenance Bypass switch through the SERVICE
position to the BYPASS position. The UPS is now bypassed,
with the load powered from utility.
To return to Normal Mode:
1. Turn the Maintenance Bypass switch to the SERVICE position.
2. Turn on the UPS ON/OFF switch (the
| position). If the switch
is already in this position, turn it off and then on again.
CAUTION
Beforeturningthe MaintenanceBypassswitchtotheUPSposition,verifythattheUPS
ON,LINE ON,and LOAD indicatorsare on.Thismaytakethree to fourminutes.
3. Turn the Maintenance Bypass switch to the UPS position to
return to Normal Mode. The UPS is powering the load.