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Figure 7 - Circuit Breaker Sequence Label
Table 7 - Maintenance Bypass Switch States
Breaker 1 = Left hand breaker = UPS Input
Breaker 2 = Center breaker = Bypass
Breaker 3 = Right hand breaker = UPS Output
State Name
Breaker
1
Breaker
2
Breaker
3
Adjacent State(s)
Normal
closed
open
closed
Overlap, Test UPS,
Test Battery
Overlap
closed
closed
closed
Normal, UPS
Unloaded
UPS Unloaded
closed
closed
open
Overlap, Maintenance
Maintenance
open
closed
open
UPS Unloaded, Load
Off
Load Off
open
open
open
Maintenance, Test
UPS
Test UPS
closed
open
open
Load Off, Normal
Test Battery
open
open
closed
Normal
Not Allowed
open
closed
closed
(none)
