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Introduction
In the unlikely event of a fault within the UPS, the SCC control logic, which continuously monitors all
critical circuits within the UPS system, transfers the load to bypass without interruption and simul-
taneously activates local and remote alarms. If a fault is detected in an individual UPS module, that
module is automatically disconnected from the critical bus and shut down. A Module Off Line status
message will appear at the SCC display. The module can be manually returned to service when the
fault has been corrected.
If the multi-module UPS system is operating in the redundant mode (at least one extra module is
available for the connected critical load), the load will remain on the UPS system if one individual
module is disconnected from the critical bus (off line). If the UPS system is operating in the non-
redundant mode, the load will be automatically transferred to bypass if a module goes off line.
The Liebert Series 610 UPS display system provides precise monitoring of the UPS, fast alarm
response and quick troubleshooting. For easy manual operations, menu-driven software provides
access to several step-by-step help screens. All operator functions are performed using menu-
prompted displays and a minimum number of operator controls. The System Control Cabinet includes
external communication capability with both automatic transmit and receive features for early warn-
ing and diagnosis of abnormal conditions.
System software allows the operator or Liebert Global Services to enter application specific informa-
tion. Overload, overvoltage, battery discharge and shutdown limits can be set by the operator. In
effect, UPS operations are tailored for each site.
The UPS system protects critical equipment from source power disturbances and outages, load faults
and UPS malfunctions. This triple protection virtually eliminates computer and computing equip-
ment downtime as a result of utility source power problems.
Figure 2
Multi-Module UPS, 500-750kVA
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