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From Thikipedia

Charger : in numerous UPS systems as a result of nature of their design another battery charger is applied, this is more common on sub 60kVA UPS systems and is very common on small sub 3kVA products.

Battery : this is the power storage section and is kept charged eith...

Rectifier : this part of the UPS charging current for the battery and also the supply requirements for the inverter and can converts the incoming alternating current (ac) supply to direct current (dc).

Charger : in a number of UPS systems as a result of character of their design another battery charger is applied, this is more common on sub 60kVA UPS systems and is very common on small sub 3kVA models.

Battery : here is the energy storage area and is kept charged possibly by the rectifier or even a separate charger. Their storage capacity is usually shown, as AH (ampere hour), which will be the amount of amperes of current that the battery can provide for an hour. There will be a quantity of limiting factors dependant on the application, usually if the design calls for a short autonomy (length of time the battery will support its load for), the batteries can be discharged to a degree, in the case of emergency lighting where there's a necessity for a autonomy the battery will not be permitted to release therefore far. These conditions help enable the maximum design life of the battery to be achieved.

Inverter : this part of the Uninterruptible power supply has an ac output to the load that is in phase with the input mains supply. Due to the amount of conversions (ac to dc to ac) and the filtering involved it can be known as a 'clean supply.'

Fixed Switch : this signal can be as simple as a relay or even more frequently using thyristors, its goal is always to move the weight between the energy mains supply and the inverter. In order that any switching between your two will be nearly seamless as has been earlier mentioned the output of the inverter is in phase with the utility mains offer. This design means that if the inverter activities an overload situation, due to its very quickly over-current detection tracks it will shift force to the more strong mains supply. A normal example would be each time a machine sheet is switched on, the inrush current, based upon the size of your uninterruptible power supplies, could cause the transfer to the application mains offer, and once switched on the load may transfer back to the inverter offering the inverter has sufficient capacity to support the load. Also a problem on the inverter can cause the load to be transferred, again essentially seamlessly; it'd be unusual for almost any lack of load to happen during these conditions.

Preservation Bypass : more an average of present in UPS systems with a volume of 6kVA or greater. The load is allowed by this arrangement to be moved under controlled conditions to the UPS and the power mains to be power down without damage. Normally carried out for program UPS preservation or UPS restore.

External Maintenance Bypass : the installing of an maintenance bypass can allow the UPS to be removed/replaced without interruption to the load, also, if the actual maintenance bypass is fed from another source it can allow load screening in the case of an important UPS restoration and/or checking of the autonomy under simulated load circumstances while the site load is being supported by the external maintenance bypass circuit. This is used when letting the UPS System to be bypassed onto standby diesel generator power. Alternately, when batteries are changed and removed, it can only be achieved by setting the uniterruptible power into outer bypass.