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R91 User's Manual
WARNING!
IF THE LOAD EQUIPMENT IS NOT READY TO ACCEPT POWER WHEN THE UPS INSTALLATION IS OCCURRING, ENSURE
THAT THE UPS OUTPUT CABLES ARE SAFELY ISOLATED AT THE CABLE ENDS.
CAUTION!
The earth ground and neutral bonding arrangement must be in accordance with local and/or national electrical
code practices.
UPS Multi-Module Installation
The basic installation procedure for a parallel system consisting of two or more R91-20KVA modules is that same
as that of a single module. The following provides installation procedures related to a parallel system.
Cabinet Installation
Connect all R91-20KVA UPS required in the parallel system as shown in the diagram below.
WARNING!
MAKE SURE THE N, A(L1), B(L2), AND C(L3) WIRING IS CORRECT, AND THAT GROUND IS CONNECTED.
Parallel Cable Installation
The shielded and double insulated control cables must be interconnected in a ring-configuration between UPS
modules as shown in the diagram below. The parallel control board is mounted in each UPS module. The ring-
configuration ensures high-reliability of the control function.
Xtreme Power Conversion Corporation
Uninterruptible Power Supply
Page 12
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