2.4 Redundant Parallel Configuration (Maximum Two UPS Units for Pn)
These configurations do not have an external System Bypass Cabinet (SBC).
Figure 2-5: Parallel UPS With Common Normal and Bypass AC Inputs
Figure 2-6: Parallel UPS With Separate Normal and Bypass AC Inputs
CAUTION If the two UPSs are placed side by side, connect as indicated above. In the other
configurations, always make sure that the cables between the UPSs and bypass
AC source have the same cross-section and the same length. The same is true
for the cables between the UPSs and the load.
To access the connections, remove cover
(see Section 1.3).
1 - The grounding conductors must be
connected to the grounding-plate of each
UPS (17).
2 - Connect the three phases of the normal
AC source to connection (16) in each UPS.
3 - Connect the three phases of the bypass AC
source to connection (15) in each UPS unit.
4 - Connect the three phases of the supplied
loads to connection (14) in UPS1.
5 - Connect (14) in UPS2 to (14) in UPS1
using the three load conductors.
6 - Connect the external battery (+/-) to
connections (22) in UPS1 and UPS2.
7 - Tie the cables down to the cabinet frames.
8 - Put the covers back in place.
To access the connections, remove cover
(see Section 1.3).
1 - The grounding conductors must be
connected to the grounding-plate of each
UPS (17).
2 - Connect the three phases of the bypass
AC source to connection (15) in each UPS.
3 - Connect the three phases of the supplied
loads to connection (14) in UPS1.
4 - Connect (14) in UPS2 to (14) in UPS1
using the three load conductors.
5 - Connect the external battery (+/-) to
connections (22) in UPS1 and UPS2.
6 - Tie the cables down to the cabinet frames.
7 - Put the covers back in place.
