Liebert EXL S1 PARALLEL CONFIGURATION
User Manual 10H52226UM60 - Rev. 1 - 01/2017
86
7. PARALLEL CONFIGURATION
Up to 8 Liebert E
XL S1 units can be connected in parallel to increase power capacity and thus to
provide more secure power to the load (redundancy).
The modules in parallel exchange information via a 37-wire shielded cable.
The total load current is shared between the modules.
For optimum performance of the parallel system and proper current sharing, especially in the Bypass
mode, make sure that the series impedance of the modules in parallel is the same.
The cross section and length of the power cables used to connect the inputs of each UPS module must
be the same. The same applies to the output cables and the battery cables, if the modules are
connected to the same DC source.
Differences of 20% are allowed for power cable lengths of up to 20m. For larger distances, cable
lengths may not vary by more than 10%.
For parallel connection between 80-NET and Liebert EXL S1, use the Parallel kit - adapter option (para
8.9. on page 98) and see below:
Figure 48 - Parallel connection between 80-NET and Liebert EXL S1
7.1. Placement into service
Placement into service of multiple-block systems must be carried out by appropriately trained
technicians.
7.2. System configurations
Fig. 49 and Fig. 50 illustrate the schema
tic diagram of a multiple-block system with SBS in various
configurations. Contact Vertiv Technical Support for more information. The SBS shown in the
diagrams may be installed in Liebert EXL S1 parallel systems where standard, 400V units are installed.
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