Liebert Series 600T - Manual (Page 96)

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, the 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 line 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.