3. UPS device description
Sensitive loads require comprehensive protection against power supply disrup-
tions. These include: temporary power failure, mains voltage fluctuations, mains
voltage peaks, changes in frequency, etc. The uninterruptible power supply is
intended to protect mains-powered, electronic devices such as, computers, work
stations, cash registers, telecommunication devices, process control systems,
etc., against power supply disruptions. In doing so, the UPS monitors the above-
mentioned net sizes and protects the loads in critical times. The support time or
autonomous period here depends on the size and status of the built-in or
adapted energy storage (accumulator) and the connected load.
3.1 Topology and operating modes
The devices of the MTX series are a so-called “VI” (VOLTAGE INDEPENDENT)
device of the UPS category C2. The device is characterized by the fact that the
load is supplied directly by the mains power supply in the standard operating
mode (supply mode) (see Fig. 3-1). Minor mains failures are then suppressed
by the mains filter.
Fig. 3-1 Block diagram or setup of the MTX series.
In the event of a massive, mains disruption, the switching unit switches to the
inverter mode (invertor mode or autonomous mode). The loads are now being
directly operated in the inverter mode for the duration of the mains disruption.
Non-critical loads can be programmed to be prematurely dropped to extend the
support time for the critical loads. During this autonomous period, the inverter
draws the required power from the accumulator. Once the mains failure has
ended, the switchover unit switches again to the standard operating mode and
the possibly dropped loads are switched on again.
If the device is connected to the network, the accumulator is charged by the
charging unit (STANDBY or charging mode). The maximum autonomous time
for the UPS always depends on the charging status, the capacity of the accumu-
lator and the connected load. For details on this, please see the chapter on
technical data in this operating manual.
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