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3. Installation and Setup
3.6 UPS Installation for Parallel Systems
Warning:
• The input harmonic current distortion will be between 3% and 4.5% in parallel UPS operations.
• One parallel kit is needed for every two UPS systems.
3.6.1 Input and Output Wiring
1. When installing the parallel system, the length of input wires (R, S, T, N) in one UPS must be equal to the input wires of the other UPS.
Likewise, the length of output wires (R, S, T, N) must also be in equal length. If not, it will cause unbalance current on the output load.
Maintenance
Breaker
Static Switch
Input
Breaker
RECT
Charger
Bat Module
Charger
Bat Module
Maintenance
Static Switch
Input
Breaker
RECT
Charger
Bat Module
Bat Module
Figure 3.6 Single Input Wiring In Parallel System
Inv
Output
Breaker
UPS Module
UPS Module
Breaker
Inv
Output
Breaker
UPS Module
UPS Module
Charger
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