Overview of Parallel System
|MIB||Mains input breaker/switch|
|BIB||Bypass input breaker/switch|
|UIB||Unit input breaker/switch|
|SSIB||Static switch input breaker/switch|
|UOB||Unit output breaker/switch|
|Ext. UOB||External unit output breaker/switch|
|MBB||Maintenance bypass breaker/switch|
|Ext. MBB||External maintenance bypass breaker/switch|
|SIB||System isolation breaker/switch|
The impedance of the bypass paths need to be controlled in a parallel UPS system. When operating in bypass mode, the parallel load sharing is determined by the total impedance of the bypass path comprising cables, switchgear, static bypass switch, and cable formation.
Risk of equipment damage
To ensure correct load sharing in bypass operation in a parallel system, the following recommendations apply:
Failure to follow these instructions can result in equipment damage.