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Once the power supply is connected to the input of the UPS (with static bypass included or with an independent static bypass line), although the inverter is “Off”
To do this, it is required to switch (Q1a), (Q4) and (Q2) to position “Off”. It is possible that the UPS might be supplying output voltage from the manual bypass, so this must be considered for the purpose of safety. If the output power supply of the UPS has to be interrupted in this situation, deactivate the switch (Q5).
In devices with battery terminals, precautions must be taken as they are not electrically insulated from the alternating input line, and there might be dangerous voltage between the battery terminals and the ground.
4.1.1. Battery safety instructions
The manipulation and connection of the batteries shall be only be carried out and supervised by personnel with battery knowledge.
For units requested without batteries, the acquisition, installation and connection of the batteries will always be done by the customer and it is under his responsibility. The relevant information on the batteries (number, capacity and voltage) are indicated in the battery label pasted beside the nameplate of the equipment. Strictly respect this data, the battery polarity connection and the circuit diagram provided with this documentation.
The battery supply can involve the risk of electric shock and can produce high short circuit current. Observe the following preventive measures before manipulating any terminal block identified in the labeling as “Battery”:
•Disconnect the corresponding protection elements.
•When connecting a battery cabinet to the equipment, respect the cable’s polarity and color
•Wear rubber gloves and shoes.
•Use tools with insulated handles.
•Removes watches, rings or other metal objects.
•Do not place metal tools or objects on the batteries.
•Never manipulate directly with your hands or through conducting objects, do not short the battery terminal block or the battery enclosure.
•Never short the battery terminals as it involves a high risk. It may result in damage to the equipment and batteries.