80 kVA - 130 kVA UPS
User’s and Installation Manual
1017397
Revision D (update)
6
UPS block diagram
An UPS module consists of several blocks each having its own functions:
•
Transients in the input and load are reduced by RFI filters.
•
AC-power is rectified and regulated in the rectifier which provides the power to
the inverter and charges the batteries. The rectifier keeps the battery fully charged.
•
The battery provides power to the load during a mains failure.
•
The inverter converts the DC-power back to AC-power, which is delivered to the
load.
•
The static bypass switch transfers automaticly the load to the bypass line when the
inverter is overloaded or the inverter is not able to feed the load.
•
Maintenance bypass switch is used to bypass the single UPS during service.
•
The control and monitoring circuitry measure, monitor and control the operation of
the UPS-system. It gives the user the status of the system operation by visual and
audible indicators.
•
The UPS sends information about the system operation via potential free relay
outputs and RS232 serial data interface This information includes data about the
utility, the load and the UPS itself. The information can be used in a computer to
ensure total protection of software and data.
Figure 1.
Block diagram of the UPS.
