Theory Of Operation - SEI DC-UPS Series User Manual

Theory of Operation

The following will provide you with an outline of operations and a list of modules found in
the DC-UPS.
Modules
• Rectifiers
• System Controller/LVD
• Battery Module
• Distribution and Connectors
RECTIFIER(S)
Rectifier
The rectifier converts AC input power to regulated DC output power. Each DC-UPS
rectifier provides up to 250 watts of power. The SEI-250 has one 250W rectifier; the SEI-
500 has two rectifiers and the SEI-750 contains 3 rectifiers. The input of each rectifier is
fused for protection...
System Controller/LVD
The System Controller has the following functions:
• Distribution of the DC power
• Battery charge voltage and current control and monitoring
• Battery Low Voltage Disconnect Function (LVD)
• Battery charge and test status indicators
• Automatic and manual battery test
• Local and Remote Alarms (optional)
THEORY OF OPERATION
SYSTEM
CONTROLLER
Functional Block Diagram DC-UPS
Figure 1
DISTRIBUTION
MODULE(S)
BATTERY
PACK
8