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3. Installation
3.7 Transformer-to-UPS Connection Line Diagram
Connections are shown below for the cabinet with built-in input isolator transformer, breakers and the red over-temperature LED.
AC Input 480V AC
Bypass Breaker
Mains Breaker
Battery input: +/–120V DC
Input Transformer
Red LED (Lit = Over-Temperature, Off = Normal)
Delta In 480V/208V Wye
Transformer Cabinet
Maintenance Breaker
PFC
Figure 3-7: Connection Line Diagram for S3MT-20K480V / S3MT-30K480V
Trip
Breaker
3PH
Inverter
STS
Charger
11
Output 208/120V AC,
3-Phase 4-Wire +
Ground to the UPS Input
Output 208/120V,
220/127V,
3-Phase, 4-Wire +
Ground to Load
Output Breaker
UPS
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