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90 Operation
3.3 Manual Procedures
The Liebert Series 600T UPS system is designed to function while unattended by an operator. The system con-
trol logic at the System Control Cabinet (SCC) monitors the performance of the UPS system, t he availability of
power sources, and the current required by the critical load.
The system control logic at the SCC:
1. Determines what overload conditions can be sustained without a transfer to bypass.
2. Initiates an automatic transfer to bypass to sustain an overload.
3. Can initiate an automatic retransfer to the UPS after a system overload has been cleared.
4. Initiates an automatic transfer to bypass and emergency module shutdown when a specified UPS fault
occurs.
The control logic at each UPS module:
1. Determines what overload conditions can be sustained by the module while it is on-line.
2. Automatically takes the UPS module off l ine and initiates an emergency module shutdown when selected
UPS faults occur.
Refer to 3.4 - Automatic Operations for more details.
Manual procedures available to the operator include Start-Up, Load Transfers, and Shutdowns. These procedures
are performed by using the operator control panel and some manually operated circuit breakers and switches.
The LCD display at each UPS cabinet includes a screen to help you with each manual procedure by listing each
step you must perform.
This section lists step-by-step controls to operate and conditions to observe in the following manual procedures:
1. Start-Up: including initial start-up, recovering from input power failure, recovering from battery shutdown,
and recovering from shutdowns for emergencies or maintenance procedures
2. Load Transfers: including transfers from UPS system to bypass, and retransfers from bypass to the UPS
system.
3. Shutdowns: including module shutdowns for maintenance procedures and emergency shutdowns.
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