9
• Compact design / without fan on all units except Protect A 1600
LCD which has a fan on the back of the unit
• Fully compliant with generator input
2.2 Principle of Operation
The UPS is connected to a shockproof socket between the public
utility’s mains and the loads to be protected.
Under normal operating conditions, i.e. if Protect A is supplied with
mains voltage, the battery charger will ensure that the battery is
always completely charged.
During this operating status, the loads connected to Protect A are
supplied with voltage via mains filters which provide effective
protection against mains voltage peaks and high-frequency faults.
In case of sustained mains under voltage or overvoltage within
defined ranges, the automatic voltage regulator (AVR) further
stabilises the load voltage. As a result, voltage fluctuations in the
public utility’s mains are reduced to a level which is acceptable for the
loads. This is performed without recourse to the internal energy
storage, something which in turn has a positive effect on battery
availability.
Protect A UPS block diagram
The static bypass switch is activated in the event of a mains failure.
The inverter then takes over the voltage supply of the connected
loads, in order to prevent the risk of data loss or damage to the loads.
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