4: Operating procedures
40
TS_604_01 PowerWave PW3000/TP User Manual UK 5/1/18
4.8
Parallel module system procedures
Figure 4.1 External maintenance bypass circuit
In a parallel module system each module will be connected to individual external module input and output isolators.
together with a System Output Breaker that connected the combined modules’ output to the load distribution panel. It is
also likely that the system will include a ‘wrap-around’ maintenance bypass circuit, comprising a System Input Breaker and
System Bypass Breaker, similar to that shown in Figure 4.1.
Before using the parallel module system operating procedures given below you should familiarise yourself with any site-
specific external switching arrangements and modify the procedures accordingly.
Key Point:
The UPS commissioning engineer will explain the function of any external power isolators and
maintenance bypass operation during the system handover.
UPS 1
UPS 2
UPS 3
UPS 4
MAINS / BYPASS
System
Output
Breaker
System
Input
Breaker
UPS 1
Input/bypass
Isolator
UPS 2
Input/byp
Isolator
UPS 3
Input/byp
Isolator
UPS 4
Input/byp
Isolator
UPS 1
Output
Breaker
UPS 2
Output
Breaker
UPS 4
Output
Breaker
UPS 3
Output
Breaker
To Load Dist. Panel
System
Bypass
Breaker
