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Introduction 7
1.2 Reliability
Reliability is the most important design goal for Uninterruptible Power Systems. Liebert Series 600 UPS systems
have demonstrated reliability by achieving a field-proven critical bus MTBF in excess of one million hours. In
addition, our Quality Assurance program is certified to the requirements of ISO 9001 standards.
Liebert Large UPS systems are ETL listed to the requirements of UL 1778. All equipment and components are
manufactured to applicable UL, NEC, NEMA, ANSI, IEEE, and CSA standards and guidelines.
Designed for Success
The keys to reliability in the design of the UPS system are using conservatively rated components, minimizing
transfers to bypass, making operator controls understandable, and providing easy access for maintenance and
repair. Liebert UPS systems lead the industry in all these areas.
For example, the Series 600T can clear substantial overloads through the solid state static bypass switch without
transferring to the bypass source. By minimizing transfers to bypass, the Series 600T minimizes operation of cir-
cuit breakers and enhances system reliability.
As another example, the system control logic has been packaged into Application-Specific Integrated Circuits
(ASICs) to eliminate the failure-prone discrete logic boards used in other brands of UPS products. Furthermore,
these ASICs are isolated from heat-generating components to ensure optimal operating temperatures.
Other Factors to Consider
Reliability depends on more than just UPS module design. Improper installation can cause any system to fail. To
prevent this, Customer Engineers from Liebert Global Services thoroughly inspect the installation of all our sys-
tems to ensure they are installed properly and operating within performance specifications.
Once a UPS is properly installed, you—the on-site equipment operator—are the most important factor in pre-
venting critical bus failures or unplanned transfers to bypass. To make your task easier, the Series 600T UPS pro-
vides easy-to-follow, prompted instructions on the industry’s largest operator display screen.
If you ever need help, call Liebert Global Services (24 hours a day at 1-800-543-2378). Your attention to proper
installation, operation, and periodic maintenance will ensure that your mission-critical operations receive the
best possible protection from electrical disturbances and outages.