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5.3.1.6.
External Maintenance Bypass Connection
If External Maintenance Bypass would be used; connect normally open auxiliary contact of External
Maintenance Bypass MCCB on the distribution panel to terminals
5.3.2.
Power Connections of Parallel Systems
• The protection devices must be chosen properly as defined in Section 4.4 considering total parallel UPS
power.
• Please check 5.3.1. Power Connections of Single Systems for detailed connection information.
• The cross section and length of the input and output cables must be identical for all units.
• Verify the phase correspondence. The phase rotation must be the same for each unit connected in
parallel and also on any external manual bypass line.
• Make sure that electrical connections and the communication cabling (CANBUS) have been made as
shown in below diagrams. You may connect all 8pcs parallel UPS following these diagrams.
• For power connection and block diagram; refer to Appendix-3: Description of UPS and Block Diagram.
30
Parallel configuration must only be activated by LEGRAND UPS Technical Service
Personnel.
CAUTION:
Do not remove the communication cables between the UPS's during Parallel
Operation.
Paralleling signal cables and UPS power cables need to be kept away from each other
and must be installed as illustrated in the following diagram. Maximum length of the
signal cable must be equal or lower than 10m.
a/X6
b/X6
and
on UPS.
Figure.5.3.1.6-1
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