UPS
3.4Dual Bus System
3.4.1Cabinet Installation
The Dual Bus System consists of two independent UPS configurations each consisting of one or more UPS modules. Dual Bus Systems are high availability configurations suitable for loads with multiple input terminals. For single input loads an optional Static Transfer Switch may be added and the stan- dard Load Bus Synchroniser activated. Depending on the configuration, follow the appropriate instal- lation instructions for each system.
Place the UPS modules side by side and interconnect as shown below.
The objective of the
Figure 18 Typical dual bus system configuration with static transfer switch and Load Bus Synch
Bypass | Bypass |
supply | supply |
|
|
|
|
| Input |
|
|
|
|
| Input | |||
|
|
|
| Rectifier |
|
|
|
|
| Rectifier | ||||
|
|
|
|
| UPS1 |
| UPS 6 |
|
| |||||
| ||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Input
Rectifier
|
|
|
|
|
|
|
|
|
|
| Input |
UPS1 |
|
|
|
|
| Rectifier | |||||
|
| UPS 6 | |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Intermodule control cable
LBS |
STS
Intermodule control cable
Load
3.4.2External Protective Devices
Refer to the instructions supplied in 1.0 - Single Module UPS Installation.
3.4.3Power Cables
The wiring of power cables is similar to that of single module system. The Bypass and the Main input sources must be referenced to the same neutral potential and input earth leakage monitoring devices, if installed, must be located upstream of the common neutral sinking point. Refer to the instructions in 1.0 - Single Module UPS Installation
31