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4 Introduction
(retransferred) to the UPS. How and when the load is returned to the UPS depends on several factors: how long
the overload lasted, how many overload conditions occurred before transfer, whether there is an imminent failure
of any part of the UPS, etc. Refer to 3.4 - Automatic Operations.
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 simultaneously sets off 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 m odule 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 automati-
cally transferred to bypass if a module goes off line.
The Series 600T 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 dial-out
and dial-in features for early warning and diagnosis of abnormal conditions.
The system software allows the operator, or Liebert Global Services, to enter application specific information.
Overload, overvoltage, battery discharge, and shutdown limits can be set by the operator. In effect, the software
is 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 equipment downtime as a
result of utility source power problems.
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