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12
3.7 Input and Output Transformer-to-UPS Connection Line Diagram
Connections are shown below for the cabinet with built-in input isolator transformer, output auto transformer and breakers with
trip and fault LED.
Figure 3-7: Connection Line Diagram
3. Installation
Input Transformer
Red LED (Lit = Over-Temperature, Off = Normal)
Output Transformer
Red LED (Lit = Over-Temperature, Off = Normal)
AC Input
480V AC
Output 480V AC
Output
208V/120V AC,
3-Phase 4-Wire
+ Ground to
the UPS Input
Transformer
Input 208V AC,
3-Phase, 4-Wire
+ Ground to
Input of Output
Transformer
UPS Output
208/120V,
3-Phase, 4-wire
+ Ground to
Input of Output
Transformer
Maintenance Breaker
Bypass Breaker
Mains Breaker
Battery input: +/–120V DC
Output Breaker
PFC
STS
Inverter
Charger
Breaker
3PH
Breaker
3PH
Transformer
UPS
Isolation Transformer
Delta in 480V/208V Wye out
Auto Transformer
Wye 208V/Wye 480V
Trip
Trip
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