Operation Of Adding/ Removing Ups-Modules - Santak ARRAY 4 User Manual

6. OPERATION OF ADDING / REMOVING UPS-MODULES
6.1 Parallel redundancy introduction
N+X is currently the most reliable structure in power protection. N represents the
minimum number of UPS-Modules of the UPS system that the total load needs; X represents
the number of the redundant UPS-Modules of the UPS system, i.e. the number of the fault
UPS-Modules that the system can handle simultaneously. The bigger X is, the higher the
system reliability is. For example, five UPS-Modules are capable of supplying a total of 20kVA,
if a total load requires only 10kVA, each UPS-Module supplies 2kVA to the output. If one
UPS-Module is removed or for some reason fails, each of the four remaining UPS-Modules
supplies 2.5kVA to the output. In this case, there are two more UPS-Modules installed for
redundancy, N=3, X=2, in other words, a maximum number of two for redundancy is
considered for the application. Therefore the reliability has been improved significantly. For
occasions where reliability is highly depended on, N+X is the optimal mode.
The UPS system can be configured with up to six UPS-Modules. It is easy and
convenient by adding or removing the UPS-Module(s) to realize power redundancy and
power expansion, or load sharing. With N+X redundancy configuration, it allows the failure of
one or more UPS-Modules without causing the UPS system to lose any functionality.
6.2 Installing and removing the UPS-Modules
ARRAY 4~24kVA adopts the hot swappable, modular design, it is able to add or remove
the UPS-Modules no matter the UPS system is off or is operating. However, please pay
attention to the UPS system, if the UPS system is supply power for load, you should make
sure that the remained UPS-Modules can provide enough power output for the load before
removing some of the UPS-Modules to prevent from overload.
6.2.1 Procedures of installing the UPS-Module
1) Remove the plastic cover panel from the position where the UPS-Module is going to
be installed;
2) Insert the UPS-Module into the frame. There are two positioning marks "●" and
warning label on the top of the UPS-Module, use two hands to hold the UPS-Module
with the marks and warning label upward, and push the module firmly until it is fully
inserted and latched into the frame.
3) Reinstall the plastic cover panel.
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