STS/MBS Operation 
 
 
Copyright © 2008-2010 Eaton Corporation.  All Rights Reserved. 
IPN 997-00012-68D    February 2010 
69
 
 
MBS Position  LED Display  Status 
AC Mains is off or unacceptable. 
Inverter output is off or unacceptable. 
AC Mains is acceptable. 
Inverter output is off or unacceptable. 
AC Mains is off or unacceptable. 
Inverter output is on but unacceptable. 
Inverter output to load via bypass switch. 
AC Mains is acceptable. 
Inverter output is on but unacceptable. 
Inverter output to load via bypass switch. 
AC Mains is off or unacceptable. 
Inverter output is acceptable. 
Inverter output to load via bypass switch. 
Inverter Bypass 
(IBP) 
  
AC Mains is acceptable. 
Inverter output is acceptable. 
Inverter output to load via bypass switch.