Also avoid short-term unit overloads, which may, for example, occur when connecting a laser printer or laser fax machine. Do not connect any household appliances to the UPS.

Never connect any additional loads to the UPS if there is a mains failure, i.e. if the UPS is working in emergency power operation.

The UPS output is de-energised if there is an overload of 150 % for longer than 200 ms during normal operation. During emergency power operation, an instant shutdown additionally takes place if there is a unit overload of > 120 % (see Chapter 3.4). As a rule, if there has never been an overload during normal operation, there will not be one during battery operation either.

5.5.4System Diagnosis / Battery Test

It is possible to press the "TEST" button (pos. 2 p. 42) to perform a manual check on the major hardware components of the UPS. This test can only be initiated if the unit is operating normally, and it involves switching the loads over to UPS inverter supply for a few seconds. As well as checking the procedures and the functional capability of the static bypass switch, this check also involves drawing current from the battery for a short time. The inverter has to provide the entire load supply, which means the entire process chain is tested with this function. Normal operation is restored after the check.

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