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7 – Operating Modes (continued)
7-5 Online (Normal) Mode (Parallel UPS—MUS)
Parallel configuration provides UPS system redundancy or
increased total capacity. Under parallel configuration, the
total load is shared by 2 to 4 UPS systems. If one of the UPS
systems malfunctions, the total connected equipment load
is supported by the remaining UPS systems. If the total load
exceeds the capacity of the remaining UPS systems, the MUS
will switch all UPS units to auto bypass mode.
The diagram illustrates the on-line mode for a 2x MUS.
7-6 Battery Backup Mode (Parallel UPS—MUS)
Similar to battery backup mode for a single UPS system
(Section 7-2), except the total connected equipment load is
shared by the parallel UPS systems (2 to 4).
The diagram illustrates the battery backup mode for a
2x MUS.
7-7 Auto Bypass Mode (Parallel UPS—MUS)
Similar to auto bypass mode for a single UPS system
(Section 7-3), except with parallel UPS systems (2 to 4).
The diagram illustrates the auto bypass mode for a 2x MUS.
12-212-93-3141.indb 18 12/28/2012 11:17:28 AM