LEGRAND KEOR T EVO - Power Connections of Parallel Systems

34
To enable the short circuit protection feature of the UPS, each load should be
supplied through a separate circuit breaker chosen according to the load current.
This may provide quick disconnection of the short circuited load and maintain
operation continuity of the other loads.
Each load should be supplied through separate circuit breaker and the cable
cross section should be chosen according to the load current value.
Make sure that the UPS is not overloaded to provide a higher quality supply to
the loads.
6.3.2. Power Connections of Parallel Systems
• The protection devices must be chosen properly as dened in Section 5.4 considering total parallel UPS
power.
• Please check 6.3.1. 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.
• 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 4pcs parallel UPS following these diagrams.
• For power connection and block diagram; refer to Appendix-6: Description of UPS and Block Diagram.
Parallel conguration must only be activated by LEGRAND UPS Technical Service
Personnel.
CAUTION: Do not remove the communication cables between the UPS’s during
Parallel Operation.