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Understanding UPS Operation
Pull Chain
Parallel CAN
Mini-Slot
Remote EPO
Interface
Interface
Board
Capacity Frame – 4 Strings Maximum
Redundant Frame – 0 Strings
INTERNAL BATTERY
NOTE Callout letters A, B, and D map to Table 3-4.
Figure 5-7. Eaton 93PM-50-1 UPS System Oneline with Internal and External Batteries
5-8
Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4
AC Input to UPS
Rectifier 3 Wire
A-B-C Rotation
A
E1, E2, E3
Optional Single-Feed
CB1 Input
Breaker
Fuse
Rectifier
Switchgear
Rectifier
Inverter
Inverter
Switchgear
Fuse
Battery
Converter
Battery
Switchgear
Fuse
CB2 Battery
Breaker
E4, E5
C
Battery
Breaker
EXTERNAL BATTERY
CABINET
(Not supplied with the UPS)
AC Input to
Bypass 4 Wire
A-B-C Rotation
B
E6, E7, E8, E12
Jumper
Fuse
Bypass
Switchgear
Static
Switch
UPM 1
AC Output to
Critical Load
E9,
D
E10,
E11,
E12
UPS CABINET
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