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UPS for 400 Vac Grid, User Guide, doc. rev. 4
3.
Overview of System Components
This section provides a brief overview of the role and function of the UPS primary components. It
includes the following sections:
1.
System controller (includes LCD control panel)
2.
UPS module (30 kVA / 30 kW)
3.
Static switch module
4.
Battery
3.1.
System controller
The UPS system controller has three main functions, including to:
1.
Control and monitor operation of the UPS according to user commands.
2.
Collect and summarize data from all sections of the UPS.
3.
Manage communication with external computers for data transfer and operation.
The UPS can operate without the system controller but with reduced
functionality.
The system controller includes the LCD control panel used to monitor and
operate the UPS.
3.2.
UPS module (30 kVA / 30 kW)
The power module is the core of the UPS, which consists of from one to ten identical internal
modules operating in parallel. The number of UPS modules installed in the cabinet depends on
the user's capacity and redundancy requirements.
Each UPS module includes a 3-phase charger with PFC (power factor correction) and a 3-phase
PWM (pulse-width modulation) inverter connected to batteries by a classic DC link.
3.3.
Static switch module
The centralized, electronic static switch enables an automatic transfer of the load from the output
of the inverters to an alternate source – the AC mains. As an example – when the inverter is
unable to supply sufficient power to the load (for example, in the event of an overload, or an
inverter failure). The static switch transfers high currents at very high speed; a typical transfer time
is less than 3 ms.
