Day 18: Function of UPS components (Con't)

Each Components in the UPS system have their own roles. The components allocate inside the system are :

1. Rectifier
2. Inverter
3. Battery
4. Bypass Transformer
5. Maintenance Bypass

There are several categories of static UPS system  available. Broadly speaking,UPS modules fall within one of three operational design architectures, namely off-line, line interactive and online.

However, irrespective of their individual design criteria features are common to all forms of static UPS systems - i.e.. they all contain batteries which stores energy when the mains supply is available and a means of converting the battery charge into an alternating current (ac) supply in times of mains failure. All systems must therefore include a battery charger and a power inverter circuit.

As described above, the battery provides a power source for the inverter when the mains supply fails, whereupon it discharges at a rate determined by the critical load connected to the UPS output. The inverter automatically shuts down when its DC supply falls below a certain voltage, therefore the duration for which the critical load can be supported in times of mains failure depends upon the battery capacity and percentage applied load.

What happens if the UPS fails?

A UPS Fault is generally seen as the inability of the inverter to provide the correct voltage or frequency at the UPS output terminals and the resulting actions that take place may vary between models. Usually, the UPS control logic will detect the failing output voltage /frequency as the load to the bypass line in a make-before-break-fashions. However, If the inverter is not synchronized to the bypass supply when the transfer is called from, it will be impossible to perform a break-free transfer operation, consequently there will be a brief supply break while the transfer takes place.

Hurm.... actually the UPS is like a mandatory usage of the organizations@firm in order to maintain their productions. Since it is well usage in industries especially O&G, UPS became frequently updated and improvised in order to meet the specifications needed by the consumers.....